Ubuntu
xserver-xorg-video-nouveau package

  1. Bug #1597437
  2. Comment #5

Comment 5 for bug 1597437

Revision history for this message
Oleg Moiseichuk (berroll) wrote :

I met with the same bug in Ubuntu 16.04.1 (amd64): 2 NVIDIA adapters with DVI and HDMI connectors on each of them, 4 identical Samsung monitors, 4th monitor is dead, 3rd is sometimes garbled, sometimes is OK. All the error messages described by Martin are the same.
Luckily in #2 he provided the method which cures the bug with ATI cards in Fedora. I decided to try it with Nouveau driver in Ubuntu and it worked!
I downloaded the sources using 'apt-get source xserver-xorg-video-nouveau', found the string in drmmode_display.c which checks whether HAS_DIRTYTRACKING2 is defined and fixed it. Then I compiled the driver and replaced '/usr/lib/xorg/modules/drivers/nouveau_drv.so' with the fixed version. After reboot all 4 monitors were working on login screen, '~/.config/monitors.xml' was created properly and all monitors were present when I logged in.
I'm attaching the patch. Maybe the developers will notice it and fix the Nouveau driver?
(BTW, ATI driver in Ubuntu 16.04 seems already fixed - I checked its sources and the mentioned string is already in place in drmmode_display.c)