Testing or playing with your USB graphics adatper on Linux.Now, on reboot, you should (hopefully!) see your login come up on your DisplayLink USB attached display! In that case, change /dev/fb0 in the “Device” section above to /dev/fb1
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. Lastly, create an X config file called nf (or similar) with the following contents and place it in /usr/share/X11/ (on recent distros on older distros, make this your nf): This option is already enabled by default in kernels 3.2+. This will turn on defio (page fault change detection) support.
To do this, create or edit a file likeĪnd reboot (or run “sudo depmod -a” and unplug/replug your adapter). Third, if you’re running kernel versions between 2.6.35 to 3.1, enable the fb_defio option of udlfb. Search for Login Screen, Double-click to display, Choose Unlock and enter your password, Select Ubuntu Classic as default session. Here’s how on Ubuntu:Ĭlick on the power button in the upper right corner (mine looks like a light switch) and choose the last option, System Settings. 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. This means that at the driver built into the Linux kernel is happy, healthy, and talking to the device. On these kernel versions, when you plug in your DisplayLink-based USB graphics device, you should get a green screen. For older kernel versions, you’ll need to update udlfb and run a modified fbdev X server (not covered in this post). The single-display case is relatively easy to set up, and we’ll cover that here.įirst, make sure you’re running kernel version 2.6.35 or later (Ubuntu 10.10 or later).
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. 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).
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