External HDMI monitor is laggy on NVIDIA-525 reverse PRIME system

If you experience this problem in Wayland sessions then that's bug 1970291.

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

Also seen in bug 2007079 and bug 2004349

Mauro mentioned that downgrading from 525 to 515 was a workaround for him. Does that sound like the same issue?

Can Mauro try the xorg-server in kinetic with NV 525 driver? if it fix the issue, we can know if they are the same issue.

He already was using kinetic when the problem occurred (bug 2004349). Although has since upgraded to lunar.

Bug 2007079 also shows the problem is in kinetic.

Hi Daniel,

The fix for this issue not only requires xorg 1.21.1.4, but also a newer version of the Nvidia driver. We have confirmed that the combination that fixes this issue is (1) xorg 1.21.1.4 (from Kinetic) + (2) a development version of the Nvidia driver, which is under NDA.

To be honest, Nvidia is also a black box for us. We don't know the root cause of the lag or whether it affects only the Nvidia-525.

OK since a full fix will require a new driver I've added an Nvidia task to track that... So the Xorg task here either shouldn't exist or should be Fix Released??

Yes, a nvidia tracker is needed. There are some questions we need to sync with nvidia.

The Xorg task is needed (for jammy) because the nvidia driver will check the version of Xorg (need 1.21.1.4+) to turn-on some features.

This might become a "Won't fix" for 525 but let's track it more accurately there for the time being.

Sounds like a fix is in 525.105.17:

> Fixed an issue which could cause applications to run at 1 FPS
> when using an NVIDIA PRIME Display Offload sink as the only
> active display.

[https://www.nvidia.com/Download/driverResults.aspx/202351/en-us/]

https://launchpad.net/ubuntu/+source/nvidia-graphics-drivers-525/525.105.17-0ubuntu1

Unfortunate that this can't be fixed with a targetted fix. The good part is that we anyway do xorg-server MRE's for HWE stack updates for LTSes - and if Timo feels comfortable enough to sponsor this backport for jammy, that's already a good clue for me.

Hello Kai-Chuan, or anyone else affected,

Accepted xorg-server into jammy-proposed. The package will build now and be available at https://launchpad.net/ubuntu/+source/xorg-server/2:21.1.4-2ubuntu1.7~22.04.1 in a few hours, and then in the -proposed repository.

Please help us by testing this new package. See https://wiki.ubuntu.com/Testing/EnableProposed for documentation on how to enable and use -proposed. Your feedback will aid us getting this update out to other Ubuntu users.

If this package fixes the bug for you, please add a comment to this bug, mentioning the version of the package you tested, what testing has been performed on the package and change the tag from verification-needed-jammy to verification-done-jammy. If it does not fix the bug for you, please add a comment stating that, and change the tag to verification-failed-jammy. In either case, without details of your testing we will not be able to proceed.

Further information regarding the verification process can be found at https://wiki.ubuntu.com/QATeam/PerformingSRUVerification . Thank you in advance for helping!

N.B. The updated package will be released to -updates after the bug(s) fixed by this package have been verified and the package has been in -proposed for a minimum of 7 days.

All autopkgtests for the newly accepted xorg-server (2:21.1.4-2ubuntu1.7~22.04.1) for jammy have finished running.
The following regressions have been reported in tests triggered by the package:

aptdaemon/1.1.1+bzr982-0ubuntu39 (amd64)
gnudatalanguage/1.0.1-3build1 (amd64)
gscan2pdf/2.12.6-1 (amd64)
nvidia-graphics-drivers-390/390.157-0ubuntu0.22.04.1 (i386)
openmsx/17.0-1ubuntu3 (amd64)

Please visit the excuses page listed below and investigate the failures, proceeding afterwards as per the StableReleaseUpdates policy regarding autopkgtest regressions [1].

https://people.canonical.com/~ubuntu-archive/proposed-migration/jammy/update_excuses.html#xorg-server

[1] https://wiki.ubuntu.com/StableReleaseUpdates#Autopkgtest_Regressions

Thank you!

Fixed in lunar with
nvidia-driver-525 525.105.17-0ubuntu1
xserver-xorg-video-nvidia-525 525.105.17-0ubuntu1

Thanks!

the only remaining failing test is just bad (nvidia 390 on i386), as it's failing always

This bug was fixed in the package xorg-server - 2:21.1.4-2ubuntu1.7~22.04.1

---------------
xorg-server (2:21.1.4-2ubuntu1.7~22.04.1) jammy; urgency=medium

  * Backport to jammy. (LP: #2009767)

 -- Timo Aaltonen <email address hidden> Tue, 04 Apr 2023 09:20:09 +0300

The verification of the Stable Release Update for xorg-server has completed successfully and the package is now being released to -updates. Subsequently, the Ubuntu Stable Release Updates Team is being unsubscribed and will not receive messages about this bug report. In the event that you encounter a regression using the package from -updates please report a new bug using ubuntu-bug and tag the bug report regression-update so we can easily find any regressions.