Category Archives: News

Plugable Launches Adapter to Enable Charging on Any Powered USB Port

It’s frustrating, but many devices won’t charge on a powered USB port the way you’d expect. This includes most Apple, Samsung, and Google phones and tablets.

This is because the phone must choose how much power to pull, and by the original USB spec devices are supposed to only draw 100mA at first. They can then negotiate up to 500mA. This negotiation requires a PC that’s attached and on.

The iPhone and most other non-tablets will charge at 500mA on a standard USB port this way. But they can also charge faster (up to 1000mA) if a port sends a special, non-standard signal to say “I’m an Apple 1A charger”. It does this by shorting the data lines (disabling data transfer at that point) and putting a specific signal voltage on each of USB’s two data lines. Even though it’s not a standard, nearly all phones and tablets on the market today recognize this signal.

For tablets like the iPad, this mechanism is even more important. Because these batteries are larger, charging at 500mA would be slow. The 1A “I’m an Apple charger” signal becomes the minimum for the tablet to report charging at all.

This new Plugable USB-MC1 Charging Adapter simulates that 1A signal, turning any powered USB port with at least 1A power available into a charging port.

Charging both a iPad 4 and iPod 3

Charging both a iPad 4 and iPod 3

This also has the effect of disabling data transfer, so you can safely plug your phone or tablet into a public computer and the phone or tablet will charge, but not be visible to the computer otherwise — you’re safe to charge without worrying about exposing your data.

Leave this attached to your phone or tablet’s USB charging cable to greatly expand the set of USB ports you can charge on.

iPad Not Charging        Ipad Charging

Above on the left is an Apple iPad connected to a standard USB hub that has plenty of power available, but you can see on the iPad’s screen in the upper right, that it’s not charging.

On the right is the same setup with our adapter in-between the iPad and the hub. You can see the iPad now sees the hub as a charger, and is charging the battery.

How many of these adapters can be safely used on a powered hub at once?

The AC adapter of your powered hub needs to be rated for at least 1A per USB charging adapter connected. If it is not, over-current may be triggered (causing all power to the hub to shut off), or the hub circuit or power supply may heat up from too much current being pulled through by the device. If this happens, remove devices until you’re back within the rated amperage.

So before you go running off and buy 10 of these little dongles to turn your 10 port hub into a charging super station, keep in mind that you are still limited by how much power the USB hub has access to. For instance, our 10 Port USB 2.0 Hub comes with a power supply of 2.5A, that is only enough to actively charge 2 devices at the Apple 1A Charger rate with .5A left for spare devices on the hub.

More questions?

The Plugable USB-MC1 product page has more detail, including a table of charging rates with some common phones and tablets. Have any other questions? We’re happy to help. Feel free to comment below or email anytime. Thanks for your support of Plugable products!

Where to buy

Plugable Power USB Universal Fast Charge-Only Adapter for for Android, Apple iOS, and Windows Device... Product Details

BT-STAND with music notes for website

Plugable Launches New Bluetooth Wireless Speaker with Integrated Tablet/Phone Stand

Have you ever wanted to watch a movie or listen to music on your tablet or phone, only to be frustrated by the awful sound from the tiny built-in speakers? Plugable has got you covered! The BT-Stand, our new Bluetooth wireless speaker, delivers surprisingly rich and resonant sound, while doubling as a stand for your tablet or phone. Compact and lightweight, it’s the perfect companion for your tablet or phone when you are on the go.

Plugable Bluetooth Wireless Speaker Tablet/Phone Stand with NFC Pairing

Plugable Bluetooth Wireless Speaker Tablet/Phone Stand with NFC Pairing

The BT-Stand’s lithium-ion battery lets you enjoy up to 10 hours of surprisingly rich, full sound, and easily recharges using the included micro USB cable. With 5 watts of power, 50Hz to 20KHz frequency response, and 85dB sound, it gives you surprising volume with very little distortion. It delivers great-sounding enhanced bass though its two 1″ main speakers and four internal 1.5″x0.75″ passive radiators with external bass reflex ports.


A great feature of the BT-Stand is support for Near Field Communication (NFC). NFC allows compatible devices like many tablets and smartphones to read connection information directly from the BT-Stand via radio when they are held next to each other. This makes pairing fast and easy. Simply align the NFC logos and tap to pair the two devices and stream your music.

Any device that supports the A2DP Bluetooth stereo protocol should work with the BT-Stand. When pairing it with a computer, we highly recommend our own Plugable USB-BT4LE Bluetooth 4.0 USB adapter. The BT-Stand also features an auxiliary 3.5mm audio input jack for use with the standard headphone output found on most non-Bluetooth devices such as iPods, other MP3 players, computers, and other devices.


The BT-Stand features solid construction with a compact V-Frame design that supports your tablet or phone and can be adjusted to multiple viewing angles. Most phones and tablets will fit, with or without a protective case or sleeve. Rubber feet provide maximum stability.


Plugable’s new BT-Stand offers a huge improvement in both volume and quality of sound over the poor-sounding integrated speakers typically found on tablets, phones, and laptops. Its compact foldable design lets you stick it in your tablet or laptop bag, backpack, or purse and bring it along wherever you go. It’s the perfect companion on road trip or vacation. Take it to the beach or park and enjoy some quality sound. You imagination is the only limit to where you can go with it!

Where to Buy

Plugable Bluetooth Stereo Speakers with Integrated 3-Point Folding Stand for Android, Apple iOS, and... Product Details

DisplayLink Apple Mac OS X 2.1 Beta now available

DisplayLink has released a beta of their new version 2.1 drivers (Sept, 2013) for Apple Mac OS X 10.6 – 10.9.

This new 2.1 driver has many improvements over the previous Mac OS X version 2.0 drivers (March, 2013). In short, it’s a must-have install for Mac users on 10.8.5 and earlier. It supports all existing DisplayLink-based USB 2.0 and USB 3.0 adapters and docks, including Plugable’s. And it’s a first step towards 10.9 support.

Here are the details.

Limited support for OS X Mavericks (10.9)

Mavericks requires updated USB graphics drivers. 2.1 is the first version from DisplayLink with support for 10.9. However, it is very rough support, with a long list of limitations, detailed below.

Once Apple and DisplayLink have further updates leading up to the release of 10.9, Apple multi-monitor enthusiasts will have a lot of improvements to look forward to, in terms of improved multi-monitor support. From Apple’s OS X Mavericks page:

There’s no longer a primary or secondary display — now each has its own menu bar, and the Dock is available on whichever screen you’re working on. You can have multiple app windows running on either display. Or run an app full screen on each one. Even show a desktop on one display and a full-screen app on another.

Support for Dual Head Docks

DisplayLink 2.1 supports the latest firmware configuration format for the latest docks and adapters, and adds support for the new Plugable UD-3900 docking station, offering dual HDMI/DVI display outputs as well as ethernet input, 2 USB 3.0 ports, and 4 USB 2.0 ports.

Ethernet bug fixes

The DisplayLink Mac 2.0 driver was the first to offer support for the DL3500 chip’s ethernet functionality. This initial release revealed a few wonky issues with ethernet on our USB 3.0 DisplayLink based product, like the Plugable UD-3000 docking station. Most common was the issue of network disconnections- where the network cable would show being unplugged even when it was actually connected.

DisplayLink 2.1 resolves all known instances of these problems, allowing you to surf in peace.

What limitations and problems remain on Mac?

For technical users on OS X seeking to maximize workspace and productivity, DisplayLink’s 2.1 driver is a big step forward. However, there are still important issues to consider:

  1. Mac OS X will not support USB 3.0 audio until 10.8.5 / 10.9. Until then, audio on a dock or display will not work when connected via USB 3.0. This is an Apple limitation. Fortunately, Apple’s support for this is coming soon.
  2. Mavericks 10.9 breaks existing USB graphics drivers. While this version 2.1 driver has some early support for 10.9, there are still many issues remaining. DisplayLink calls out these issues:
    • Screen corruption and layout issues when adding more than one additional DisplayLink monitor.
    • Some applications using single buffer rendering may flicker on DisplayLink monitor.
    • Scrolling pages in Safari may cause corruption on DisplayLink screen.
    • Playing movie in QuickTime may cause the title bar to flicker.
    • Fast user switching may not work correctly when using DisplayLink monitors.
    • Sometimes rotating one DisplayLink monitor rotates a different display.
    • Sometimes when DisplayLink monitor is set as primary after waking up from sleep it is disconnected and there is no login screen visible.
    • Corruption on the screen may be visible while rotating DisplayLink displays.

    In short, until DisplayLink and Apple have further updates for 10.9, DisplayLink users should avoid the upgrade to 10.9 if possible.

  3. DisplayLink’s OS X 2.1 driver relies on system CPU and not GPU processing, so the video and application-specific notes in our previous blog post, DisplayLink USB Graphics and OS X Limitations, remain relevant.

The bottom line is that DisplayLink 2.1 fixes a number of larger bugs relating to ethernet and dual display outputs under OS X 10.8 “Mountain Lion” and provides initial support for OS X 10.9 “Mavericks”. This makes our USB 3.0 docking station products a whole lot better on OS X. Just keep in mind that this is still in beta, and it may introduce its own little quirks.

Additional details and the driver .dmg download are here:
DisplayLink 2.1 OS X Beta Forum.

We’re here to help and we welcome your questions. Email anytime, or just comment below. Thanks for going out of your way for Plugable products!

Plugable UD-3900 USB 3.0 SuperSpeed Universal Docking Station with Dual Video Outputs for Windows 8.... Product Details

Plugable UD-3000 USB 3.0 SuperSpeed Universal Docking Station for Windows 8.1, 8, 7, XP (HDMI and DV... Product Details

New 2013 Google Nexus 7 and USB Ethernet Adapters

The new 2013 Google Nexus 7 (“Gen 2″ or “flo”) has a bug where USB Ethernet adapters won’t work — they’ll appear to be recognized, but won’t get a DHCP address.

This is with Android 4.3, builds JSS15J and JSS15Q at least.

There is an open bug on this issue, we we’re hopeful that Google will fix quickly with an update:

Until then, it’s important to realize that USB Ethernet adapters won’t work. So far, there is no evidence of this affecting other devices (e.g. the original Nexus 7 is not yet affected).

In combination with a USB OTG cable, it’s common to use USB Ethernet adapters to get wired network connectivity for performance (2-3x wireless) and security reasons.

For advanced users familiar with rooting devices and flashing custom ROMS, the latest CyanogenMod builds should now have this fixed.

New Plugable USB 3.0 Universal Docking Station (with Dual Monitor Support)

We’re excited to announce the launch of our newest UD-3900 USB 3.0 Universal Laptop / Tablet docking station, adding an additional HDMI port to our UD-3000 docking station, currently the #1 selling Laptop Docking Station on

Using DisplayLink’s top-of-the-line DL-3900 chipset, this unit offers all the functionality the DisplayLink chip has to offer, plus the latest VL812 USB 3.0 hub chipset from Via Labs for extra available USB ports.

Here are the two models side-by-side

Plugable UD-3000 Plugable UD-3900
$99.99 $129

We’re excited to add this integrated, more cost-effective option for getting two extra displays (plus lots of other functions), all via a single USB 3.0 cable.

For both of these models, support is currently for Windows only. DisplayLink has new Mac drivers version 2.1 coming in future weeks which will allow us to update our recommendation for Mac.

And if you have any questions at all, please feel free to comment below or email us at – we’re happy to help. Thanks!

Where to Buy

Plugable UD-3900 USB 3.0 SuperSpeed Universal Docking Station with Dual Video Outputs for Windows 8.... Product Details

Plugable UD-3000 USB 3.0 SuperSpeed Universal Docking Station for Windows 8.1, 8, 7, XP (HDMI and DV... Product Details

Plugable's Testing Station for Charging Behavior

The State of USB Charging

The humble Universal Serial Bus, more commonly known as USB has evolved to be much more than just a way to connect a mouse or keyboard to your computer. With the proliferation of power hungry portable devices that charge over USB, we’ve all come to expect USB to operate as a Universal Source of Battery charging, but unfortunately it’s just not that easy.

The original USB 2.0 specification limited the power that could be drawn from any USB port to 500mA. This is plenty to charge smaller batteries reasonably quickly, but for larger batteries a higher power solution is needed. This has driven device makers to come up with novel ways to draw more than the allowed 500mA from USB 2.0 ports and in general has been accomplished by the USB port signaling to the devices that it’s ok for the device to draw current at a higher rate.

Unfortunately there hasn’t been a widely adopted standard, so not all ports and devices speak the same language when it comes to charging. And, to make the situation even more frustrating for end users, there hasn’t been much public discussion or documentation about what has been done.

iPads for example, are one device that can charge at a very quick rate, up to 2.1Amps when connected to an Apple computer or Apple charger but they will potentially not charge at all when connected to a regular USB port. There’s also the BC 1.1 charging standard that some devices like the Kindle Fire or the Nexus 7 support, but that support is usually undocumented. We find out about charging behavior through trial and error.

So, try we did! We’ve been working hard to unravel the mysteries of what will charge where by testing every device we have on all of our hubs and chargers, and publishing this data on the product pages for each of our devices with USB ports.

We’re also collecting reports from end users though a quick form that let’s you add to the knowledge base of charging behavior.

Here’s what’s been added so far:

To add your device visit:

Check the FAQ on each of these pages for the details of our in-house test results.

Plugable Launches a New USB 3.0 Flash Card Reader

Tired of waiting for your photos to download? For photographers and other flash card users who want their files in a hurry, Plugable has introduced a new USB 3.0 flash card reader that combines blazing read speeds with the colorful design of our popular and well-reviewed USB 2.0 reader.

Plugable's new USB 3.0 card reader

How fast is it? As fast as your card allows it to be. In our testing with a newly-bought UHS-1 32GB SDHC card ($20 from Amazon), we saw read speeds over four times faster than our USB 2.0 device. Write speed improvements were in the range of 30 to 40 percent.

Results with less-advanced cards were throttled by inherent speed limitations of the cards themselves. Class-10 SDHC cards that were not UHS-1 clocked 15 to 20 percent gains in read speeds, while cards below Class 10 showed very little difference between USB 2.0 and USB 3.0.

So if you want to ensure the highest speeds from our new USB 3.0 flash card reader, make sure the card displays the UHS-1 logo. It makes a huge difference in your results.

Test results

Testing Platform: Windows 7 Pro 64-bit computer
Card: Sony 32GB SDHC Class 10 UHS-1 R40 Memory Card, purchased on Amazon for $20.
USB 2.0 reader: Plugable USB2-CARDRAM3
USB 3.0 reader: Plugable’s new USB3-FLASH3

Plugable USB 2.0 and USB 3.0 card  readers

Plugable USB 2.0 (top) and USB 3.0 (bottom) card readers

Photo test — 356 photos, 1.38 GB
USB 2.0 1:28 min
USB 3.0 28 seconds

Benchmark test using the Atto Disk Benchmark software
USB 2.0 Read 18 MB/s Write 16 MB/s
USB 3.0 Read 73 MB/s Write 21 MB/s

Benchmark results for USB 3.0 (left) and USB 2.0 (right)
130722_USB3.0_Card_reader 130722_USB2.0_Card_reader

For any questions, contact

Plugable SuperSpeed USB 3.0 Flash Memory Card Reader for Windows, Mac, Linux, and Certain Android Sy... Product Details

USB hubs and chargers: What happens when you pull too much power?

USB power and charging issues are surprisingly complex. It’s natural to assume that hubs “deliver” a certain amount of power to a device. But that’s not really how it works. Devices can pull as much power as they want, but there are consequences. Devices are supposed to follow certain rules, like pulling no more than 100mA unless they configure up to a higher amperage (500mA for USB 2.0 and 900mA for USB 3.0). This is to avoid voltage drops which might knock other devices off the bus. Hubs and chargers are supposed to fail gracefully if a device pulls too much.

And it’s all gotten more confusing as USB has become a primary way of charging phones and tablets. There are many proprietary methods devices use to detect “their charger” and start pulling higher amperages. The USB-IF has a standard for doing this called the Battery Charging class, but the big guys like Apple, Samsung, and others don’t follow it universally.

So what happens when a device pulls more power than a hub or charger expects? What does a graceful or non-graceful failure look like? We wanted to know.

How we tested

To test what happens when a device draws too much power from a port, we needed a USB “device” that let us set the amount of power that it draws.  We came up with a box that uses large resistors to place a load on the USB power lines, simulating a device drawing power.  Instead of using the power to actually do something as a device would, our device simply dissipates it as heat.


The box itself was designed in SketchUp and printed on a Printrbot 3D printer.

The red and black connectors are connected to the ground and +5V lines of the USB bus, and connected to a meter so that the bus voltage can be monitored.  Each of the switches at the top turns on one bank of resistors below.  Each set of resistors is chosen so that they draw 500 mA, 1 A, 2 A, and 4 A from a 5 volt supply.  By selecting different combinations of resistors, it can draw from 0.5 A all the way to 7.5 A in 500 mA steps.  Remember that the limit for USB 2.0 is only 0.5 amps–so we can pull up to 15 times more current than a host should be able to deliver.  This was on purpose.  We wanted to be able to take a hub and its power supply to the maximum, then a little further. Everyone here was really hoping for a fire (for better or worse, we weren’t able to create that much excitement even at the highest load).

Once connected to the device under test, the power draw was increased from 0 all the way to 7.5 amps, and the voltage recorded at each stop.  While it claims 7.5 amps, on every test we did, the actual current was less than 7.5 amps because the draw had caused the supply voltage to drop, reducing the current.

What We Found

Below are the test results from several of our devices.

UD-3000 USB 3.0 Docking Station

Power Supply Rating: 5V 4A


UD-3000 Results

The UD-3000 has a 4A power adapter, and actively tries to prevent attached devices from affecting the core functions of the dock (graphics, network, audio). When the next step after the last one on this chart was turned on with the current tester, the port was disabled, and no longer delivered power until the load was removed.  The UD-3000 properly cut power to the offending port, and as a result, the DisplayLink device and other USB ports would continue to function in this situation.

Each USB port of the UD-3000 is equipped with a device called a polyfuse.  A polyfuse is a type of resettable fuse that automatically disconnects a power supply when too much power is drawn through the fuse.  When the load is removed, the fuse returns to its initial state.

While the polyfuse in the UD-3000 device was the one that cut power to the device, the voltage drop before that happened was due to the voltage regulation in the AC power adapter.  While the voltage had dropped considerably before power was cut, it was not low enough to cause devices to disconnect, and was far more than any device should be able to draw.

USB2-HUB-AG7 7 Port USB 2.0 Hub

Power Supply Rating: 5V 3A


This is an example of a device with USB ports that do not have polyfuses.  There is a direct connection from the AC adapter input, to the USB ports.  This means that devices can draw as much power as they want, without being shut off.  This is an obvious advantage, as it allows for the usage of devices like the Raspberry Pi that perform no power negotiation, and can draw upwards of 1.5A with devices connected to the Raspberry Pi.  You can read more about the USB2-HUB-AG7 with the Raspberry Pi here.

While it looks like the voltage was quite low at the end of the test–and it is–this is because we were drawing nearly double the rated current capacity of the AC adapter.  At its rated current (3A), the voltage was still high enough to prevent USB device disconnections.  Past its rated current, it did continue to function, but the voltage was too low for some devices to function properly, and may reduce the life of the AC adapter.

PS12-USB2 Surge Protector Charging Port

USB Output Rating: 5V 2.1A


PS12-USB2 Results

Our surge protector is another device that properly handles an overcurrent situation.  On the surge protector, it states “2.1A Shared” between the two USB ports.  The test data show that when the current draw is increased above ~2.3A, the surge protector cuts voltage in order to reduce the current draw.  The regulator on this device is “smarter” than a simple polyfuse, and tries to reduce voltage so that the device will still receive some power, if at a lower voltage.  The voltage regulator in this device also did the best job of maintaining the supply voltage at 5 volts under greater loads.

Questions? Comments? Feel free to comment below!


DisplayLink Graphics, Ethernet, and Audio Limitations on OS X 10.8.4

Plugable uses DisplayLink chips in all our USB 3.0 universal docking stations and graphics devices. DisplayLink’s chip and drivers can provide an extra display or two, along with audio and networking ports, all via one USB cable. For users seeking an affordable way to expand their Mac, this can both simplify connecting everything and increase the number of devices you are able to use – especially for thin and light Macs and MacBooks with few expansion ports.

Unfortunately, at the moment there are significant limitations, especially for USB 3.0, that will require fixes from both Apple and DisplayLink to solve. We list these limitations and known workarounds below.

Click the categories listed to the right to skip ahead for the status of open issues on OS X 10.8.4, however please note that older OS X versions may have different and unique issues as described below.

OS X Versions

Because of important Apple fixes in 10.8.3 that solve login screen problems and others, applying all available OS X updates prior to installation is recommended. OS X versions 10.8.1 and 10.8.2 are not supported, and must be updated before driver installation.

The latest updates for of 10.6 Snow Leopard and 10.7 Lion are also required for installation.

Older OS X versions such as 10.5 Leopard and 10.4 Tiger have a totally different beta-quality driver which is no longer supported: as a result, we do not recommend our USB display adapters for Macs running these OS X versions.


UPDATE: As of OS X 10.8.5, audio is working well over both USB 3.0 and USB 2.0 connections.

As of 10.8.4, OS X does not support USB 3.0 audio, so connecting via USB 2.0 instead of USB 3.0 is the only way to use the audio features on devices like the Plugable UD-3000 docking station or USB3-HDMI-DVI graphics adapter.

This issue is due to Apple not yet having a USB 3.0 audio class driver in OS X. However, we have reason to believe OS X update 10.8.5 may add this support. Resolution of this issue is dependent on future Apple OS X updates, so we cannot estimate a timeframe to resolve this issue.

If audio is important, our UD-160-A Universal Docking Station avoids this issue, since it is USB 2.0 only.


For our USB 3.0 DisplayLink based products with Ethernet, like our Plugable UD-3000 docking station, there are special USB Ethernet issues on OS X. To date, we are aware of two issues:

  1. IPv6 related kernel panics on OS X 10.8.4 (workaround available below).
  2. Network disconnects on OS X 10.8.x (ethernet detected as unplugged even when connected, or no network access when a valid IP is reported).

To date, all cases of IPv6 related kernel panics have been resolved by disabling IPv6 support only for the UD-3000′s ethernet port using the following command at a terminal window:

networksetup -setv6off "Plugable UD-3000"

For the command to complete, an administrative users password must be entered.

If you are experiencing issues where your UD-3000′s ethernet network connection is plugged in, however the connection is listed as cable unplugged in Network Preferences, please submit the output from the DisplayLink support tool, available here:

DisplayLink Support Tool


For basic use scenarios like working with documents, web browsing, managing media libraries, or even streaming video, most users shouldn’t see any issues – however it is important to note some expected limitations of USB graphics devices. On OS X, any displays that aren’t “traditionally” attached via DisplayPort or Thunderbolt, users should be aware that a systems GPU will NOT be available to the USB attached displays. Since USB attached displays are reliant on CPU power alone, any additional load on the system (running additional programs, etc) may reduce video performance.

For a real world example, it is entirely reasonable to expect that a system would have enough CPU power to drive a USB attached display, and to update it quickly enough to reveal no issues when simply streaming video from YouTube or Netflix. If the same system is also running other CPU intensive processes (things like video editing, working with large 3d CAD files, or gaming) the performance on the USB attached display might drop- even when the “traditionally” attached displays are running well thanks to their access to the system’s GPU. This is why we recommend USB graphics only for “productivity” and “light video” usage on secondary (not primary) monitors. For a list of specific known issues and available workarounds, read on.

Some other specific issues arising from this limitation are:

  1. Disabling hardware acceleration in both Firefox and Chrome is sometimes necessary to avoid issues with mouse cursor lag or with items being rendered in odd shapes/sizes onscreen. For instructions on disabling hardware acceleration, go here.
  2. Using a USB attached display as the primary is neither supported or recommended – although users can avoid most issues with this scenario by using Spotlight to launch applications instead of Launchpad.  For further details click here.
  3. “Coherence mode” in Parallels 8 will not work when a DisplayLink adapter is in use, although it does after unplugging the adapter.
  4. Full screen video does not work in Adobe CS6 applications when USB displays are attached. Removing the USB display devices will allow this feature to work.
  5. Safari’s frequently visited sites new tab screen may flicker on USB attached displays.  Using Chrome or Firefox with GPU acceleration disabled is a recommended workaround.
  6. CoverFlow view in finder may flicker on USB attached displays.
  7. HDCP is not supported. While Netflix works in a Chrome browser window- so trying other applications may help in case of HDCP related playback issues- applications like iTunes that require HDCP will fail on USB attached displays..

Disabling Hardware Acceleration in web browsers on OS X
Because USB attached displays cannot benefit from the system GPU hardware for graphics acceleration, disabling these features in web browsers used on USB attached displays will actually improve performance. We’ve seen noticeable differences doing this in both Chrome and Firefox. Safari does not have global options to disable hardware acceleration, so using other browsers on USB attached displays is recommended.

To disable hardware acceleration in Chrome:

  1. Open Chrome preferences by using the keyboard combination “Command” (AKA Windows) key + , (comma).  Alternatively, from the menu bar for chrome, select preferences, as pictured here:chrome preferences
  2. Next, scroll to the very bottom of the preferences page.  Find and select “show advanced settings” as shown to the right.  More options will be revealed:chrome advanced settings
  3. Scroll to the bottom of the newly revealed settings, and uncheck the box pictured below to disable hardware acceleration:Chrome HWA
  4. Last but not least, restart chrome to apply the changes (close and re-open the application, or click the pictured option to “restart” restart

To disable hardware acceleration in FireFox:

  1. Use the keyboard combination “Command” or “Windows” key and , (comma) to launch FireFox preferences. Alternatively, select preferences from the FireFox menu bar as shown here:firefox preferences
  2. Click the gear icon to access the “Advanced Settings” for Firefox, then make sure the hardware acceleration option is de-selected as shown below:disable HWA firefox

Using an external display as primary on OS X
The only recommended method for using an external display as primary on OS X (using an external monitor for your menu bar, dock, and core OS X features like Launchpad) is to use a display output built in to your Mac or MacBook.  Setting a USB attached display as primary is neither supported nor recommended.

This is because LaunchPad may have substantial delays when used on a USB attached display set as the primary display. For MacBook owners, this means that whatever display you want to use to launch programs in LaunchPad MUST be attached using one of the DisplayPort or Thunderbolt outputs on your Mac for normal operation.  

While it is possible to use several external displays on OS X (as this user photo shows, there are several limits on the USB attached displays that are not present on the “traditionally” attached displays)- keep this in mind when designing your workspace. 

Have questions, or an issue that you don’t see listed here?  Please let us know – email anytime, and we welcome your comments below. Thanks!

Windows 8.1 Preview – DisplayLink Drivers

Windows 8.1 offers some great improvements, and we’re already seeing users (particularly Surface Pro users) who are trying the preview.

The preview of Windows 8.1 just came out yesterday, and it’s important to note that it appears to break compatibility with some existing drivers. When you upgrade to 8.1, drivers are not migrated from 8.0, rather they appear to be re-enumerated and re-installed.

The most widespread change appears to be some new driver signing requirements which may cause 3rd party drivers to need an update. Also specific to USB graphics is Windows 8.1 introduces a new WDDM 1.3 graphics model, which requires some additional updates.

DisplayLink’s technology, which we use in our docks and adapters, is affected. If you upgrade to 8.1 without a driver upgrade, you’ll lose your extra screens.

Fortunately, DisplayLink appears to be doing a good job of staying ahead of all these changes (they’ve been working with earlier NDA builds, in partnership with Microsoft), and have released their preview driver with support for Windows 8.1 on the same day.


DisplayLink’s 7.4 preview driver with Windows 8.1 support is available here.

We installed Windows 8.1 when it came out yesterday, and the new DisplayLink driver, and while I’m sure there’s issues there somewhere, all of our quick tests showed good results in a production environment. If you do find any issues, let us know. Or post on DisplayLink’s forum (the link above) to get the feedback directly to them, or comment here.

So for anyone updating to Windows 8.1, please install the DisplayLink 7.4 Preview driver. You can even do this before the upgrade — the 7.4 preview works also on earlier versions of Windows, and when 8.1 does a re-enumeration it will find the driver if you’ve already converted over. A reboot may be required to get things to settle.

Hope that background helps. Thanks for going out of your way for Plugable products!