Status changed to 'Confirmed' because the bug affects multiple users.
** Changed in: nvidia-graphics-drivers-495 (Ubuntu)
Status: New => Confirmed
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https://bugs.launchpad.net/bugs/1950720
Title:
GSYNC bug regression in 495.44 Ubuntu 21.10
Status in nvidia-graphics-drivers-470 package in Ubuntu:
Confirmed
Status in nvidia-graphics-drivers-495 package in Ubuntu:
Confirmed
Bug description:
Similar to bug https://launchpad.net/bugs/1950665, the GSYNC
regression bug has returned in 495.44 on Ubuntu 21.10. I have tried
the standard kernel and 5.14.1 and 5.14.17, but they are all
experiencing the same bug again.
Hardware is:
- NVIDIA GeForce RTX 2080 Super
- Dell 27" S2721DGF G-Sync Compatible monitor
- High quality DisplayPort cable (This was replaced previously under
suspicion)
This issue happens at all refresh rates: 60 Hz, 120 Hz, 144 Hz and 165
Hz.
Prior to upgrading to Ubuntu 21.10, I had upgraded to 495.44 on Ubuntu
21.04 and kernel 5.14.1, and this problem was not present.
I then upgraded to Ubuntu 21.10, and the problem didn't seem to be
present, but as of today I've noticed again.
I'm not sure what the cause is, but I have tried full driver purges,
returned to 470.82, went back to the standard kernel for 21.10
(5.13.0-21-generic), 5.14.1 and 5.14.17, and the problem continues to
occur when any GPU accelerated application starts, in some cases when
switching between applications (i.e. alt tabbing out of a game). A
second or so of no signal occurs as it re-syncs.
I am unsure if X11 has been updated in this time, I know there was
work happening on GBM support, wondering if X11 has switched to using
this instead of the EGL Streams direct approach that was used
previously. Either-way, I'm still running X11 in all of these tests.
Let me know if there are any tests you'd like me to try.
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