I’m still affected by this issue despite the alleged driver fix. I’ve been running Ubuntu 20.04 for quite some time with a conventional GSYNC monitor and have upgraded to an Asus XG27UQ GSYNC Compatible monitor and this display loses sync if the framerate drops below the VRR threshold and regains sync after blanking out within a few seconds then loses sync again in-game only if the framerate drops below the VRR threshold.
I have tested with the DP cable supplied with the monitor and after experiencing the issue I then purchased a shorter 1m Comsol DP cable (DPDP8K01). Both cables are compliant with DP 1.4 spec and support up to 8K, no adapter is being used, it is plugged directly to the GPU’s DP port and I have tested all DP ports, the problem still persists. The behavior has been observed so far first within the game “Doom Eternal” using the Proton Windows-to-Linux compatibility layer within Linux, I then tested it with the game “Black Mesa” which is a native Linux application using OpenGL and observed the same fault, in both cases upon every replication attempt. Disabling GSYNC/Adaptive Sync within the driver or alternatively via the monitor OSD totally prevents the behavior from occurring. I upgraded to the 495.44 driver from 470.82 with no change in behaviour, I uninstalled this and installed the 470.86 driver in hopes that it would resolve the issue, it has not. This issue is not reproducible under Windows 10, I have tested it thoroughly and the display never blanks out under Windows and I’ve confirmed VRR is engaged via the GSYNC indicator within the driver, this only happens for me on Linux with all the drivers I’ve tried (470.82, 495.44, 470.86). I still have my conventional GSYNC monitor in my possession, the issue cannot be reproduced under Linux using the Dell S2616DG with GSYNC enabled after swapping back to it when troubleshooting. After swapping back to the XG27UQ I have since also tried driver 460.91, no change in behaviour, problem still persists. I have already raised this with Nvidia’s Customer Care team and their representative has declined to offer further assistance or an escalation pathway to resolution on the basis that Nvidia’s support channel doesn’t support Linux. -- You received this bug notification because you are a member of Kernel Packages, which is subscribed to nvidia-graphics-drivers-470 in Ubuntu. 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. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/nvidia-graphics-drivers-470/+bug/1950720/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : kernel-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp
