Plugable

Plugable’s New USB 2.0 Switch for Sharing a Device or Hub Between Two Computers

Posted on 02. Feb, 2012 by Aaron Knopf in USB2-SWITCH2

Here’s a scenario our customers frequently describe: “I just got a new USB-based printer and want to share it between two computers. But the printer isn’t networkable. What should I do?”

The inexpensive solution: Plug the printer’s USB cable into the computer where you have something to print. Repeat as needed.

The easier solution: Get the Plugable USB2-SWITCH2 for fast, one-touch switching of the printer–well, really any USB 1.1/2.0 device or hub–between two computers. One computer has access to the device at a time.

For anyone who’s been involved with information technology for a while, the practice of using a switch to share access between multiple computers and a device is not new. But the power of USB dramatically enhances the potential of what can be shared.

In the days before USB, you had to buy a specialized switch that was compatible with the connection cable used by the device to which you wanted to share access. For example, a keyboard-video-mouse switch–abbreviated as a KVM switch–provided switched access to just those three devices.

A USB switch enables two computers to access a single USB device, like a printer.

Now with a USB-based switch, you can set up switched access between two computers to any USB 1.1/2.0 device–no specialized switch boxes necessary for each device. And if you connect the switch to a USB hub, you’ll have switched access to all the devices connected to the hub. This can offer a lot of flexibility.

Attach a USB hub to a USB switch to enable two computers to access all the devices connected to the hub.

Here’s an example from our lab of the way you can maximize the USB2-SWITCH2’s potential:

• Connect a PC running Windows 7 and a Mac Mini running OS/X.
• Attach a Plugable USB2-HUB-AG7 powered seven-port hub to the switch.
• Plug the following devices into the hub:
• A Plugable USB-VGA-165 display adapter (set to mirror the main display)
• A Plugable USB2-E100 10/100 Ethernet adapter
• A USB-based keyboard and mouse

With a single button press, you can switch access to a mouse, a keyboard, a display, and a network connection between two computers running different operating systems. And you’ll still have three ports in the hub to spare for a printer, scanner, external hard drive, webcam, or any of the multitude of USB-based devices that exist. Watch the video below to see our configuration in action.

The switch requires no drivers. Just connect it to any two computers with USB 1.1/2.0 ports via the included five-foot USB A/B cables, attach a device or hub, and that’s it. Be aware that the attached device might require drivers to use it with your computer’s operating system. The first time you switch access to the device, you may either be asked to install drivers if you haven’t already or receive an error if your computer’s operating system can’t recognize the device. If you switch to a hub connected to multiple devices, you may have to go through driver installs for all those devices.

The USB2-SWITCH2 comes with two five-foot USB A/B cables.

The USB2-SWITCH2 is available at Amazon.com. We’d love to hear your stories about how you use this incredibly simple but highly effective device in your home or office. If you have any questions about its functionality or have trouble getting it set up, write us at support@plugable.com. We’re here to help.

Plugable USB 2.0 Switch for One-Button Swapping of USB Device/Hub Between Two Computers

Product Details

$14.99

Plugable’s New USB 2.0 2-Port Hub

Posted on 30. Dec, 2011 by Bernie Thompson in USB2-2PORT

The newest small and light laptops and tablets don’t have enough USB ports.

Because of that, it’s nice to be able to throw a small USB hub in your bag for extra connectivity when you’re travelling. You want a durable hub without any parts sticking out that are easy to break. Where the hub is a single integrated unit, so nothing will get disconnected and lost. With ports that are in line with the cable, so cables aren’t running all directions on your desk when you’re using it. And a hub without so many ports that it needs its own power adapter anyway (which would be too bulky).

It’s for these kinds of needs that we’re targeting our simple new USB 2.0 2-Port Hub.

It features a clean, compact design. With a standard USB 2.0 High Speed hub controller inside (NEC/Renesas µPD720114 2-port), it enables two devices to share a single available USB port with full USB 2.0 compatibility and performance.

Because it’s bus powered, the 2 ports share the available 500 mA from the single upstream port. It’s a perfect match for use with low powered devices such as keyboards and mice or self powered devices like printers, powered hubs, and powered external hard drives. Note, though, that you won’t want to use an unpowered hub like this for charging.

Features

• Standard 2 Port USB 2.0 compliant USB hub controller chipset
• Compatible with all USB 2.0 and 1.1 devices
• Supports full data rates of 1.5/12/480 Mbps
• USB bus powered
• Compact, in-line design to minimize cable clutter

Have any questions? Email support@plugable.com anytime – we’ll be happy to help.

Where to Buy

Plugable USB 2.0 2 Port Hub

Product Details

$9.20

Howto: DisplayLink USB Single Monitor on Linux

Posted on 23. Dec, 2011 by jerome in Using

Unfortunately, Linux doesn’t support multiple graphics adapters the way Windows does, which means you can’t just plug in USB graphics adapters and expect them to extend your desktop (the good news is there is progress on this support).

What is possible, however, is running a single DisplayLink adapter, or several with a Xinerama or multiseat configuration — just as long as you don’t expect to use your main GPU at the same time.

The single-display case is relatively easy to set up, and we’ll cover that here.

First, make sure you’re running kernel version 2.6.35 or later (Ubuntu 10.10 or later). For older kernel versions, you’ll need to update udlfb and run a modified fbdev X server (not covered in this post). On these kernel versions, when you plug in your DisplayLink-based USB graphics device, you should get a green screen. This means that at the driver built into the Linux kernel is happy, healthy, and talking to the device.

Second, if you are running Unity Desktop in Ubuntu 11.04 or later, you’ll need to switch back to Classic Mode so you’re running straight X. Here’s how on Ubuntu:

Click on the power button in the upper right corner (mine looks like a light switch) and choose the last option, System Settings. Search for Login Screen, Double-click to display, Choose Unlock and enter your password, Select Ubuntu Classic as default session.

Third, if you’re running kernel versions between 2.6.35 to 3.1, enable the fb_defio option of udlfb. To do this, create or edit a file like
/etc/modprobe.d/50-displaylink.conf

and add the single line

options udlfb fb_defio=1

And reboot (or run “sudo depmod -a” and unplug/replug your adapter). This will turn on defio (page fault change detection) support. This option is already enabled by default in kernels 3.2+.

Lastly, create an X config file called 60-plugable.conf (or similar) with the following contents and place it in /usr/share/X11/xorg.conf.d (on recent distros; on older distros, make this your xorg.conf):

 
Section "Device" 
  Identifier "uga" 
  driver "fbdev" 
  Option "fbdev" "/dev/fb0" 
EndSection 
 
Section "Monitor" 
  Identifier "monitor" 
EndSection 
 
Section "Screen" 
  Identifier "screen" 
  Device "uga" 
  Monitor "monitor" 
EndSection 
 
Section "ServerLayout" 
  Identifier "default" 
  Screen 0 "screen" 0 0 
EndSection

Note: if your main GPU creates a /dev/fb0 even when the USB display is not attached, then your USB display is probably getting assigned to /dev/fb1. In that case, change /dev/fb0 in the “Device” section above to /dev/fb1

Now, on reboot, you should (hopefully!) see your login come up on your DisplayLink USB attached display!

This kind of simple setup is useful for:

• Testing or playing with your USB graphics adatper on Linux.
• Embedded systems with USB but no GPU.
• As a backup method when the main GPU or its driver isn’t available or working.
• Systems where a USB graphics adapter enables higher modes (up to 2048×1152) than the main GPU screen.

Please comment if you have any trouble with this single display case. See our past posts for additional information about the DisplayLink Linux kernel driver and some more involved setups.

The instructed here work on all Plugable USB 2.0 graphics adapters and Plugable USB 2.0 docking stations and thin clients (and should also generally work on all DisplayLink based products).