| Summary: | Flickering and graphical glitching after upgrading to Plasma 6.4 (NVIDIA, Wayland) | ||
|---|---|---|---|
| Product: | [Plasma] kwin | Reporter: | German <kde-bugtracker> |
| Component: | compositing | Assignee: | KWin default assignee <kwin-bugs-null> |
| Status: | REPORTED --- | ||
| Severity: | normal | CC: | filip.kendes1, jakub, nate, thorry |
| Priority: | NOR | ||
| Version First Reported In: | 6.4.0 | ||
| Target Milestone: | --- | ||
| Platform: | Arch Linux | ||
| OS: | Linux | ||
| Latest Commit: | Version Fixed In: | ||
| Sentry Crash Report: | |||
| Attachments: | Video demonstrating the issue | ||
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Description
German
2025-07-11 00:24:12 UTC
Can't help you, but can ask a few questions. To try to find the cause so that the devs have easier time later. Do you have freesync/g-sync enabled, did you try to disable them? Change the resfresh rate. Change the color accuracy in the display configuration section of system settings. (https://bugs.kde.org/show_bug.cgi?id=506895) Do you want to try nvidia proprietary drivers or nouveau for a second? Sorry, posted wrong bug ticket in my first comment, wanted to link https://bugs.kde.org/show_bug.cgi?id=503458 I'm seeing this too on Plasma 6.4.2, nvidia 575.64 RTX 4000, but only on the open-modules driver + GSP. Proprietary modules without GSP seem to be artifact free. I get the most intense flickering artifacts when switching virtual desktops and alt-tabbing. Some windows (primarily Brave browser) also have a weird corrupted border/line that renders below my window, way beyond the actual window dimensions. I also force ozone to use the wayland backend. There are some other issues with stuttering/freezing with electron (so chrome-based) apps, but those seem to be universal on open & proprietary kernel, and on xwayland and wayland backends of ozone. Not sure if they're related to this one. (In reply to Filip from comment #1) > Can't help you, but can ask a few questions. To try to find the cause so > that the devs have easier time later. > > Do you have freesync/g-sync enabled, did you try to disable them? > Change the resfresh rate. > Change the color accuracy in the display configuration section of system > settings. (https://bugs.kde.org/show_bug.cgi?id=506895) > Do you want to try nvidia proprietary drivers or nouveau for a second? Sure, I’ll answer anything to help. 1. My monitor is FreeSync-capable (connected over DP to an NV card) and it always stays on. I was under the impression that’s not really supported on Linux/KDE. Regardless, I've just verified that the issue is still present with it off on the monitor level. 2. My current refresh rate is 144.00 Hz. I've switched to 120.00 Hz and the issue remained. Same with 99.98 Hz, and even 59.97 Hz. 3. My color accuracy was indeed set to prefer efficiency. I've now set it to prefer color accuracy, but the issue remained. Strangely it seems to occur even more, but the nature of the issue is pretty random so I can't say if it's causation or correlation. I was actually using the proprietary drivers when I updated to 6.4 and encountered the problem. I switched to nvidia-open but alas it was still glitching out. I don't particularly want to go through the trouble of switching to nouveau (and, besides, that has its own slew of issues). HDR is off, Adaptive sync or VRR is also set to never. Fractional scaling is off as well with the scale being set to 100%. Screen tearing is allowed in fullscreen windows (which I also tried turning off, the issue remained). Also, I realize now that I forgot to provide my Qt version. It's 6.9.1. Thanks for checking all that, sorry it didn't help. Hopefully someone can fix the bug. Can confirm I have the exact same issues as OP, ever since I upgraded from 6.3 to 6.4. I'm running pretty much the same setup as OP, the combination of 6.4 and Nvidia might be the issue, I haven't had the chance to check another videocard. Just like OP I've been messing with a bunch of different settings and nothing seems to change. It's very intermittent, sometimes it's perfectly fine for 30 mins, then it will become almost unusable with glitches all over the place. It's possible a change in Plasma 6.4 triggered or exacerbated a pre-existing NVIDIA driver issue. |