** 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/. + 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: 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 + 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. + 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 OpenGL the following settings are enabled: + 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 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. + 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 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. + 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 launchpad bug seems to reference the type of - regression I experienced https://launchpad.net/bugs/1950665. + 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)
-- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1950720 Title: GSYNC bug regression in 495.44 Ubuntu 21.10 To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/nvidia-graphics-drivers-470/+bug/1950720/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
