Comment 55 for bug 1296315

few commands output:

ubuntu@ubuntu:~/Downloads/DisplayLink-Ubuntu-1.0.68$ xrandr
Screen 0: minimum 320 x 200, current 3840 x 1080, maximum 8192 x 8192
LVDS-1 connected primary 1920x1080+0+0 (normal left inverted right x axis y axis) 382mm x 215mm
   1920x1080 60.0*+ 60.0 40.0
   1680x1050 60.0
   1400x1050 60.0
   1280x1024 59.9
   1280x960 59.9
   1152x864 60.0
   1024x768 59.9
   800x600 59.9
   640x480 59.4
   720x400 59.6
   640x400 60.0
   640x350 59.8
VGA-1 disconnected (normal left inverted right x axis y axis)
HDMI-1 disconnected (normal left inverted right x axis y axis)
DP-1 disconnected (normal left inverted right x axis y axis)
DVI-1-0 connected 1920x1080+1920+0 344mm x 194mm
   1920x1080 60.0*+
   1280x1024 75.0
   1024x768 75.1 70.1 60.0
   800x600 72.2 75.0 60.3
   640x480 75.0 72.8 60.0

ubuntu@ubuntu:~/Downloads/DisplayLink-Ubuntu-1.0.68$ xrandr --listproviders
Providers: number : 2
Provider 0: id: 0x65 cap: 0x1, Source Output crtcs: 2 outputs: 4 associated providers: 1 name:nouveau
Provider 1: id: 0x310 cap: 0x2, Sink Output crtcs: 1 outputs: 1 associated providers: 1 name:modesetting

ubuntu@ubuntu:~/Downloads/DisplayLink-Ubuntu-1.0.68$ ls -l /dev/fb*
crw-rw---- 1 root video 29, 0 Aug 16 18:29 /dev/fb0
crw-rw---- 1 root video 29, 1 Aug 16 18:35 /dev/fb1

ubuntu@ubuntu:~/Downloads/DisplayLink-Ubuntu-1.0.68$ uname -a
Linux ubuntu 3.19.0-15-generic #15-Ubuntu SMP Thu Apr 16 23:32:37 UTC 2015 x86_64 x86_64 x86_64 GNU/Linux

ubuntu@ubuntu:~/Downloads/DisplayLink-Ubuntu-1.0.68$ lsb_release -d
Description: Ubuntu 15.04