[Bug 1950890] [NEW] Latest Xorg-Server 21.1.1 Breaks NVIDIA Driver 340.108 after Upgrade: Temporary Fix in xorg.conf

[Ejmarkow]

Public bug reported:

Xorg Server doesn't start anymore after an upgrade to
xorg-x11-server-21.1.1 from xorg-x11-server-1.20.13 which breaks NVIDIA
Driver 340.108. NVIDIA driver compiles fine without any issue. Using
Linux Kernel 5.15 with all patches.

Content of /var/log/Xorg.0.log:

================ WARNING WARNING WARNING WARNING ================
This server has a video driver ABI version of 25.2 that this
driver does not officially support.  Please check
http://www.nvidia.com/ for driver updates or downgrade to an X
server with a supported driver ABI.
=================================================================

To fix the ABI version issue (until a patch is introduced), adjust
/etc/X11/xorg.conf with the following content:

Section "ServerFlags"
    Option "IgnoreABI" "true"
EndSection

After this xorg.conf adjustment, Xorg-server starts and works well.

** Affects: command-not-found (Ubuntu)
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1950890

Title:
  Latest Xorg-Server 21.1.1 Breaks NVIDIA Driver 340.108 after Upgrade:
  Temporary Fix in xorg.conf

Status in command-not-found package in Ubuntu:
  New

Bug description:
  Xorg Server doesn't start anymore after an upgrade to
  xorg-x11-server-21.1.1 from xorg-x11-server-1.20.13 which breaks
  NVIDIA Driver 340.108. NVIDIA driver compiles fine without any issue.
  Using Linux Kernel 5.15 with all patches.

  Content of /var/log/Xorg.0.log:

  ================ WARNING WARNING WARNING WARNING ================
  This server has a video driver ABI version of 25.2 that this
  driver does not officially support.  Please check
  http://www.nvidia.com/ for driver updates or downgrade to an X
  server with a supported driver ABI.
  =================================================================

  To fix the ABI version issue (until a patch is introduced), adjust
  /etc/X11/xorg.conf with the following content:

  Section "ServerFlags"
      Option "IgnoreABI" "true"
  EndSection

  After this xorg.conf adjustment, Xorg-server starts and works well.

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