| Summary: | Graphical glitches in plasma 6.1 when AMD GPU is used on AMD/NVIDIA hybrid GPU system | ||
|---|---|---|---|
| Product: | [Plasma] kwin | Reporter: | Lucas Lima <lima.lucas.ma> |
| Component: | wayland-generic | Assignee: | KWin default assignee <kwin-bugs-null> |
| Status: | RESOLVED FIXED | ||
| Severity: | normal | CC: | andreas.d.korb, fanzhuyifan, kde, nate, postix, pranav.3943, vlad.zahorodnii, xaver.hugl |
| Priority: | NOR | ||
| Version: | 6.1.90 | ||
| Target Milestone: | --- | ||
| Platform: | Other | ||
| OS: | Linux | ||
| Latest Commit: | https://invent.kde.org/plasma/kwin/-/commit/b437c65815b2898564748f3be48c4145671a750f | Version Fixed In: | 6.1.3 |
| Sentry Crash Report: | |||
| Attachments: |
Graphical Glitches in 6.1.90 with triple buffering
Screen Cast when running with Tripple Buffering |
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Description
Lucas Lima
2024-05-31 12:26:07 UTC
Does it only happen with Konsole? Is your konsole slightly transparent? No, it happens around many applications. I'm not using any transparency in Konsole. As mentioned, it also happens when displaying a YouTube video in full-screen. Here's an example of it happening in Firefox: https://youtu.be/xUSUyo_cfNo Thank you quite anooying indeed. To which card are the screens connected? So my hardware is the following: ~ lspci -nnk | grep VGA 01:00.0 VGA compatible controller [0300]: NVIDIA Corporation GA104M [GeForce RTX 3080 Mobile / Max-Q 8GB/16GB] [10de:249c] (rev a1) 06:00.0 VGA compatible controller [0300]: Advanced Micro Devices, Inc. [AMD/ATI] Cezanne [Radeon Vega Series / Radeon Vega Mobile Series] [1002:1638] (rev c4) --- I have a setup to change the main renderer using KWIN_DRM_DEVICES as the following line in /etc/enviroment (please note that there are udev rules to setup those paths mentioned here) 1. KWIN_DRM_DEVICES=/dev/dri/fixed-reference/amd-card:/dev/dri/fixed-reference/nvidia-card Or when I want when I want to use the nvidia card: 2. KWIN_DRM_DEVICES=/dev/dri/fixed-reference/nvidia-card:/dev/dri/fixed-reference/amd-card Surprisingly enough, the issue seems to happen only when I'm using the amd-card as the primary renderer. When using 2., the issue doens't seem to happen. Can reproduce with Intel + NVidia as well. Replacing the egl explicit sync code used for multi gpu copies in the drm backend with glFinish() makes the glitches go away, so this might be a driver issue. Looks like more users are facing the same issue in reddit: https://www.reddit.com/r/kde/comments/1dt0wlj/display_issues_after_nvidia_555_driver_update/ As the egl explicit sync code was already used in 6.0, I bisected this to figure out what changed and the glitches only happen with triple buffering. As a workaround you can set KWIN_DRM_DISABLE_TRIPLE_BUFFERING=1 for KWin. A possibly relevant merge request was started @ https://invent.kde.org/plasma/kwin/-/merge_requests/6033 Git commit b437c65815b2898564748f3be48c4145671a750f by Xaver Hugl. Committed on 02/07/2024 at 12:48. Pushed by zamundaaa into branch 'Plasma/6.1'. backends/drm: disable triple buffering on NVidia Until we figure out what's wrong, it's best to leave it disabled M +1 -1 src/backends/drm/drm_output.cpp https://invent.kde.org/plasma/kwin/-/commit/b437c65815b2898564748f3be48c4145671a750f Hey guys, sorry to bring the bad news but this is still happening in kwin_wayland 6.1.2 when using the AMD graphics as the primary. Using KWIN_DRM_DISABLE_TRIPLE_BUFFERING=1 makes it go away. Here's some evidence: https://youtu.be/Bp9Lkkh_On8 The patch didn't make it into 6.1.2, it's only in 6.1.3 Apologies! Thought it was included based on the change log: https://kde.org/announcements/changelogs/plasma/6/6.1.1-6.1.2/ The changelog for the Nvidia driver 550.100 [0]: > Fixed a bug that caused OpenGL triple buffering to behave like double buffering. [0] https://www.nvidia.com/Download/driverResults.aspx/228542/en-us/ That's about a different thing, but also great to see that fixed Hi,
Sadly, I have to re-open this since the situation seems to have gotten worse with 6.1.2.
Here's the behavior and the configuration that causes it:
- Desktop corruption:
KWIN_DRM_DEVICES=/dev/dri/by-vendor/amd:/dev/dri/by-vendor/nvidia, with KWIN_DRM_DISABLE_TRIPLE_BUFFERING unset, or
KWIN_DRM_DEVICES=/dev/dri/by-vendor/nvidia:/dev/dri/by-vendor/amd and KWIN_DRM_DISABLE_TRIPLE_BUFFERING=0
- No corruption:
KWIN_DRM_DEVICES=/dev/dri/by-vendor/amd:/dev/dri/by-vendor/nvidia, with KWIN_DRM_DISABLE_TRIPLE_BUFFERING=1 or
KWIN_DRM_DEVICES=/dev/dri/by-vendor/nvidia:/dev/dri/by-vendor/amd and KWIN_DRM_DISABLE_TRIPLE_BUFFERING unset
I've attached a video highlighting the issue. I've also attached a screen recording that interestingly doesn't capture the issue.
Here are the system details again:
Operating System: Arch Linux
KDE Plasma Version: 6.1.90
KDE Frameworks Version: 6.6.0
Qt Version: 6.8.0
Kernel Version: 6.11.1-arch1-1 (64-bit)
Graphics Platform: Wayland
Processors: 16 × AMD Ryzen 9 5900HS with Radeon Graphics
Memory: 15,0 GiB of RAM
Graphics Processor: Advanced Micro Devices, Inc. [AMD/ATI] Cezanne / NVIDIA GeForce RTX 3080 Laptop GPU/PCIe/SSE2
Manufacturer: ASUSTeK COMPUTER INC.
Product Name: ROG Zephyrus G15 GA503QS_GA503QS
System Version: 1.0
Created attachment 174463 [details]
Graphical Glitches in 6.1.90 with triple buffering
Captured when running with AMD card as primary and KWIN_DRM_DISABLE_TRIPLE_BUFFERING unset
Created attachment 174464 [details]
Screen Cast when running with Tripple Buffering
This is a screen recording done with Triple Buffering enabled, which interestingly enough doesn't show the issue.
Updating to the 6.2.0 release fixed the issue. |