Hi Daniel, I've updated the description and added a video of the behaviour for your reference.
Hopefully it's a bit clearer for you now. Thanks ** Description changed: - 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. + [ Description ] - Hardware is: - - NVIDIA GeForce RTX 2080 Super - - Dell 27" S2721DGF G-Sync Compatible monitor - - High quality DisplayPort cable (This was replaced previously under suspicion) + Video of signal loss with flipping enabled: https://youtu.be/V5DGcHN-BJs + + In NVIDIA the 495 driver for Ubuntu 21.10, with G-SYNC enabled in OpenGL + Settings of NVIDIA Settings, the G-SYNC compatible monitor loses sync + momentarily (1~2 seconds) when switching to GPU accelerated application. + Examples of this are; when launching a game full-screen game, launching + a GPU accelerated Windows game, launching Steam, launching kitty + terminal https://sw.kovidgoyal.net/kitty/. 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. + Note: that this example doesn't explicitly show G-SYNC being the issue, + rather when G-SYNC is enabled in the settings, it will produce this + behaviour. - I then upgraded to Ubuntu 21.10, and the problem didn't seem to be - present, but as of today I've noticed again. + [ Hardware ] - 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. + - NVIDIA GeForce RTX 2080 Super + - Dell 27" S2721DGF G-Sync Compatible monitor + - High quality DisplayPort cable - 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. + [ Settings ] - Let me know if there are any tests you'd like me to try. + In OpenGL the following settings are enabled: + - Sync to VBlank Enabled + - Allow Flipping Enabled + - Image Setting: High Performance + - Allow G-SYNC-/G-SYNC Compatible Enabled + - Use Conformant Texture Clamping Enabled + + [ Observations ] + + When I disable Allow Flipping, the issue goes away. No signal is lost + when changing to different GPU accelerated applications. However, + Flipping is required for G-SYNC to function, therefore losing the + benefit of G-SYNC. + + [ Correlation to previous bug ] + + This issue was present in 21.04, eventually driver 495.44 resolve this + problem on the 5.14.1 kernel. I will add that when I first had this + machine and screen in 21.04, it was not experiencing the flipping issue. + + The bug described in the launchpad bug seems to reference the type of + regression I experienced https://launchpad.net/bugs/1950665. + + [ Troubleshooting ] + + Full driver purges between trying different drivers: + + - Tried downgrading to 470.82 + - Went back to the standard kernel for 21.10 (5.13.0-21-generic) at the time + - Tried deleting ~/.nv, ~/.cache/nvidia + - Reverted to previous X11 settings + - Tried 5.14.1 which was working in Ubuntu 21.04 + - Tried kernels 5.14.17, 5.15.6 + - Persists in 470.94 (NVIDIA bundle and Graphics Drivers PPA) + - Persists in 495.46 (NVIDIA bundle and Graphics Drivers PPA) + - Persists in 510.39.01 (NVIDIA bundle) ** Description changed: [ Description ] Video of signal loss with flipping enabled: https://youtu.be/V5DGcHN-BJs In NVIDIA the 495 driver for Ubuntu 21.10, with G-SYNC enabled in OpenGL Settings of NVIDIA Settings, the G-SYNC compatible monitor loses sync momentarily (1~2 seconds) when switching to GPU accelerated application. Examples of this are; when launching a game full-screen game, launching a GPU accelerated Windows game, launching Steam, launching kitty terminal https://sw.kovidgoyal.net/kitty/. This issue happens at all refresh rates: 60 Hz, 120 Hz, 144 Hz and 165 Hz. - Note: that this example doesn't explicitly show G-SYNC being the issue, + Note: that this example doesn't explicitly show G-SYNC being enabled, rather when G-SYNC is enabled in the settings, it will produce this - behaviour. + behaviour. If I disable G-SYNC, but leave flipping enabled, the issue is + not present. If I enabled G-SYNC, but disable flipping, the issue is not + present. [ Hardware ] - NVIDIA GeForce RTX 2080 Super - Dell 27" S2721DGF G-Sync Compatible monitor - High quality DisplayPort cable [ Settings ] In OpenGL the following settings are enabled: - Sync to VBlank Enabled - Allow Flipping Enabled - Image Setting: High Performance - Allow G-SYNC-/G-SYNC Compatible Enabled - Use Conformant Texture Clamping Enabled - + [ Observations ] When I disable Allow Flipping, the issue goes away. No signal is lost when changing to different GPU accelerated applications. However, Flipping is required for G-SYNC to function, therefore losing the benefit of G-SYNC. [ Correlation to previous bug ] This issue was present in 21.04, eventually driver 495.44 resolve this problem on the 5.14.1 kernel. I will add that when I first had this machine and screen in 21.04, it was not experiencing the flipping issue. The bug described in the launchpad bug seems to reference the type of regression I experienced https://launchpad.net/bugs/1950665. [ Troubleshooting ] Full driver purges between trying different drivers: - Tried downgrading to 470.82 - Went back to the standard kernel for 21.10 (5.13.0-21-generic) at the time - Tried deleting ~/.nv, ~/.cache/nvidia - Reverted to previous X11 settings - Tried 5.14.1 which was working in Ubuntu 21.04 - Tried kernels 5.14.17, 5.15.6 - Persists in 470.94 (NVIDIA bundle and Graphics Drivers PPA) - Persists in 495.46 (NVIDIA bundle and Graphics Drivers PPA) - Persists in 510.39.01 (NVIDIA bundle) ** Description changed: [ Description ] Video of signal loss with flipping enabled: https://youtu.be/V5DGcHN-BJs In NVIDIA the 495 driver for Ubuntu 21.10, with G-SYNC enabled in OpenGL Settings of NVIDIA Settings, the G-SYNC compatible monitor loses sync momentarily (1~2 seconds) when switching to GPU accelerated application. Examples of this are; when launching a game full-screen game, launching a GPU accelerated Windows game, launching Steam, launching kitty terminal https://sw.kovidgoyal.net/kitty/. This issue happens at all refresh rates: 60 Hz, 120 Hz, 144 Hz and 165 Hz. Note: that this example doesn't explicitly show G-SYNC being enabled, rather when G-SYNC is enabled in the settings, it will produce this behaviour. If I disable G-SYNC, but leave flipping enabled, the issue is not present. If I enabled G-SYNC, but disable flipping, the issue is not present. [ Hardware ] - NVIDIA GeForce RTX 2080 Super - Dell 27" S2721DGF G-Sync Compatible monitor - High quality DisplayPort cable [ Settings ] In OpenGL the following settings are enabled: - Sync to VBlank Enabled - Allow Flipping Enabled - Image Setting: High Performance - Allow G-SYNC-/G-SYNC Compatible Enabled - Use Conformant Texture Clamping Enabled [ Observations ] When I disable Allow Flipping, the issue goes away. No signal is lost - when changing to different GPU accelerated applications. However, - Flipping is required for G-SYNC to function, therefore losing the - benefit of G-SYNC. + when changing to different GPU accelerated applications. Sometimes there + is a brief flicker when opening a GPU accelerated program with flipping + disabled, but it's not a single loss, rather a very fast few frame + flicker. Flipping is required for G-SYNC to function, therefore losing + the benefit of G-SYNC if I were to disable flipping. [ Correlation to previous bug ] This issue was present in 21.04, eventually driver 495.44 resolve this problem on the 5.14.1 kernel. I will add that when I first had this machine and screen in 21.04, it was not experiencing the flipping issue. The bug described in the launchpad bug seems to reference the type of regression I experienced https://launchpad.net/bugs/1950665. [ Troubleshooting ] Full driver purges between trying different drivers: - Tried downgrading to 470.82 - Went back to the standard kernel for 21.10 (5.13.0-21-generic) at the time - Tried deleting ~/.nv, ~/.cache/nvidia - Reverted to previous X11 settings - Tried 5.14.1 which was working in Ubuntu 21.04 - Tried kernels 5.14.17, 5.15.6 - Persists in 470.94 (NVIDIA bundle and Graphics Drivers PPA) - Persists in 495.46 (NVIDIA bundle and Graphics Drivers PPA) - Persists in 510.39.01 (NVIDIA bundle) ** Description changed: [ Description ] Video of signal loss with flipping enabled: https://youtu.be/V5DGcHN-BJs In NVIDIA the 495 driver for Ubuntu 21.10, with G-SYNC enabled in OpenGL Settings of NVIDIA Settings, the G-SYNC compatible monitor loses sync momentarily (1~2 seconds) when switching to GPU accelerated application. Examples of this are; when launching a game full-screen game, launching a GPU accelerated Windows game, launching Steam, launching kitty terminal https://sw.kovidgoyal.net/kitty/. This issue happens at all refresh rates: 60 Hz, 120 Hz, 144 Hz and 165 Hz. Note: that this example doesn't explicitly show G-SYNC being enabled, rather when G-SYNC is enabled in the settings, it will produce this behaviour. If I disable G-SYNC, but leave flipping enabled, the issue is not present. If I enabled G-SYNC, but disable flipping, the issue is not present. [ Hardware ] - NVIDIA GeForce RTX 2080 Super - Dell 27" S2721DGF G-Sync Compatible monitor - High quality DisplayPort cable [ Settings ] In OpenGL the following settings are enabled: - Sync to VBlank Enabled - Allow Flipping Enabled - Image Setting: High Performance - Allow G-SYNC-/G-SYNC Compatible Enabled - Use Conformant Texture Clamping Enabled [ Observations ] When I disable Allow Flipping, the issue goes away. No signal is lost when changing to different GPU accelerated applications. Sometimes there is a brief flicker when opening a GPU accelerated program with flipping disabled, but it's not a single loss, rather a very fast few frame flicker. Flipping is required for G-SYNC to function, therefore losing the benefit of G-SYNC if I were to disable flipping. [ Correlation to previous bug ] This issue was present in 21.04, eventually driver 495.44 resolve this problem on the 5.14.1 kernel. I will add that when I first had this machine and screen in 21.04, it was not experiencing the flipping issue. The bug described in the launchpad bug seems to reference the type of regression I experienced https://launchpad.net/bugs/1950665. [ Troubleshooting ] Full driver purges between trying different drivers: - Tried downgrading to 470.82 - Went back to the standard kernel for 21.10 (5.13.0-21-generic) at the time - Tried deleting ~/.nv, ~/.cache/nvidia - - Reverted to previous X11 settings + - Reverted to previous X11 conf - Tried 5.14.1 which was working in Ubuntu 21.04 - Tried kernels 5.14.17, 5.15.6 - Persists in 470.94 (NVIDIA bundle and Graphics Drivers PPA) - Persists in 495.46 (NVIDIA bundle and Graphics Drivers PPA) - Persists in 510.39.01 (NVIDIA bundle) -- 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: [ Description ] Video of signal loss with flipping enabled: https://youtu.be/V5DGcHN- BJs In NVIDIA the 495 driver for Ubuntu 21.10, with G-SYNC enabled in OpenGL Settings of NVIDIA Settings, the G-SYNC compatible monitor loses sync momentarily (1~2 seconds) when switching to GPU accelerated application. Examples of this are: - When launching a game full-screen - Launching a GPU accelerated game in Window mode - Launching Steam - Launching kitty terminal https://sw.kovidgoyal.net/kitty/ This issue happens at all refresh rates: 60 Hz, 120 Hz, 144 Hz and 165 Hz. Note: This example doesn't explicitly show G-SYNC being enabled in the onscreen indicator, rather what happens when G-SYNC is enabled in the settings. If I disable G-SYNC, but leave flipping enabled, the issue is not present. If I enabled G-SYNC, but disable flipping, the issue is not present. If both are enabled, then the issue occurs. [ Hardware ] - NVIDIA GeForce RTX 2080 Super - Dell 27" S2721DGF G-Sync Compatible monitor - High quality DisplayPort cable [ Settings ] In the NVIDIA OpenGL settings, the following settings are enabled: - Sync to VBlank Enabled - Allow Flipping Enabled - Image Setting: High Performance - Allow G-SYNC-/G-SYNC Compatible Enabled - Use Conformant Texture Clamping Enabled [ Observations ] When I disable Allow Flipping, the issue goes away. No signal is lost when changing to different GPU accelerated applications. Sometimes there is a brief flicker when opening a GPU accelerated program with flipping disabled, but it's not a signal loss, rather a very fast momentary flick of the display, but it's does not impact usability. As flipping is required for G-SYNC to function, therefore losing the benefit of G-SYNC if I were to disable flipping. [ Correlation to previous bug ] This issue was present in Ubuntu 21.04, eventually driver 495.44 resolved this problem on the 5.14.1 kernel. I will add that when I first had this machine and screen in 20.10 and 21.04, it was not experiencing the signal loss issue. The bug described in the change log in this launchpad bug seems to reference the type of regression I am experiencing https://launchpad.net/bugs/1950665. [ Troubleshooting ] Full driver purges between trying different drivers: - Tried downgrading to 470.82 - Went back to the standard kernel for 21.10 (5.13.0-21-generic) at the time - Tried deleting ~/.nv, ~/.cache/nvidia - Reverted to previous X11 conf - Tried 5.14.1 which was working in Ubuntu 21.04 - Tried kernels 5.14.17, 5.15.6 - Persists in 470.94 (NVIDIA bundle and Graphics Drivers PPA) - Persists in 495.46 (NVIDIA bundle and Graphics Drivers PPA) - Persists in 510.39.01 (NVIDIA bundle) 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
