present: Crash in 'present_scmd_get_crtc' and 'present_flush' (NVIDIA 495.46)

[Mazen Mardini]

This bug causes xserver to crash when using newer Nvidia drivers (NVIDIA 495.46+) with Optimus. It's apparently triggered when using the MATE desktop environment. It has been noticed on xorg-server-21.1, but it's likely affecting version 1.20.13 as well.

It has been fixed already, but could you please backport the fix?

Patch that fixes it is here: https://gitlab.freedesktop.org/xorg/xserver/-/merge_requests/841/diffs?commit_id=22d5818851967408bb7c903cb345b7ca8766094c

The bug report at freedesktop.org is here: https://gitlab.freedesktop.org/xorg/xserver/-/issues/1275

Thank you!

[Mazen Mardini (mazen-mardini)]

I can confirm that this patch works. It fixed the crash on my computer. I'm running the Nvidia 510.47 drivers.

[Martin Wimpress  (flexiondotorg)]

I confirm this issue affects users of NVIDIA 495 and 510 drivers if they use an Xpresent compositor such as Marco (the MATE Windows Manager) or Metacity 3.42. It affects Ubuntu MATE 20.04 and 21.10 users.

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.

[dlotton (yellow56)]

Same issue here. Two systems running Mint Mate 20.3.

System #1: GeForce GTX 1050 Ti
System #2: RTX A4000

[Stephen (belrik)]

Confirmed same issue as recorded here: https://github.com/mate-desktop/mate-session-manager/issues/297

Please release a fix for Ubuntu MATE as focal 20.04 currently crashes with Nvidia drivers.

[kyle (kmcclure)]

This issue affects me, too. Ubuntu mate 20.04 with Nvidia Quadro P2200 Graphics card. Please fix for the Mate desktop.

[Jacob Moroni (jakemoroni)]

This affects me in the sense that Xpresent support in Marco was temporarily disabled in 22.04 until this is fixed, which ultimately results in screen tearing with Intel Iris Xe integrated graphics.

[Sebastien Bacher (seb128)]

The fix is in this update

https://bugs.launchpad.net/ubuntu/+source/xorg-server/2:21.1.3-2ubuntu1

[Rob Pieke (robpieke)]

Apologies for my rookie message, but I'm trying to track the roadmap for a 20.04 fix/roll-out. Is this the place to ask? Virtual cookies/beers as thanks in advance :)

[Daniel van Vugt (vanvugt)]

20.04 is tracked by the 'Focal' line near the top of this page.

[Mazen Mardini (mazen-mardini)]

If you don't like to wait for the patch to be applied, here is what you can do (for focal):

If you end up having unmet dependencies at step 7, install them using "sudo apt install package-name".

1. mkdir xorg-server && cd xorg-server
2. git clone -b applied/ubuntu/focal-security https://git.launchpad.net/ubuntu/+source/xorg-server
3. cd xorg-server/debian/patches
4. wget https://bugs.launchpad.net/ubuntu/+source/xorg-server/+bug/1959995/+attachment/5572420/+files/nvidia-495-fix.patch
5. echo "nvidia-495-fix.patch" >> series
6. cd ../..
7. dpkg-buildpackage -us -uc
8. cd ..
9. sudo dpkg -i ./*.deb
10. sudo systemctl reboot

Done. Next you can install newer Nvidia drivers and there shouldn't be any issues.

Note: This is the patch from https://gitlab.freedesktop.org/xorg/xserver/-/issues/1275

[Rob Pieke (robpieke)]

Many thanks Daniel & Mazen!

[Ubuntu Foundations Team Bug Bot (crichton)]

The attachment "nvidia-495-fix.patch" seems to be a patch. If it isn't, please remove the "patch" flag from the attachment, remove the "patch" tag, and if you are a member of the ~ubuntu-reviewers, unsubscribe the team.

[This is an automated message performed by a Launchpad user owned by ~brian-murray, for any issues please contact him.]

[Martin Wimpress  (flexiondotorg)]

Xpresent is currently disabled in Marco (the MATE window manager) in Jammy. When xorg-server 2:21.1.3-2ubuntu1 migrates from Proposed, then Xpresent needs to be re-enabled.

[Martin Wimpress  (flexiondotorg)]

The i386 build failed a month ago and is preventing migration from proposed:

- https://bugs.launchpad.net/ubuntu/+source/xorg-server/2:21.1.3-2ubuntu1/+build/23194148

[Timo Aaltonen (tjaalton)]

proposed has -2ubuntu2, and it builds on i386

the blocker has been nvidia-390 and then the various kernels that can't migrate alone

[Martin Wimpress  (flexiondotorg)]

Now xorg-server 2:21.1.3-2ubuntu2 has migrated to the release pocket in Jammy, macro can have Xpresent re-enabled.

[Martin Wimpress  (flexiondotorg)]

Fixed in 22.04 via xorg-server 2:21.1.3-2ubuntu2

[Daniel van Vugt (vanvugt)]

Strictly speaking, the fix for this bug was introduced in xorg-server 2:21.1.3-2ubuntu1

[Launchpad Janitor (janitor)]

This bug was fixed in the package marco - 1.26.0-3ubuntu0

---------------
marco (1.26.0-3ubuntu0) jammy; urgency=medium

  * debian/control:
    + Add B-D: libxpresent-dev. (LP: #1959995)

 -- Martin Wimpress <email address hidden> Sat, 02 Apr 2022 10:45:19 +0000

[Brian Murray (brian-murray)]

Ubuntu 21.10 (Impish Indri) has reached end of life, so this bug will not be fixed for that specific release.