https://bugs.kde.org/show_bug.cgi?id=424311
Bug ID: 424311
Summary: Severe Rendering Issues on Latest Nvidia Driver
(450.57) (Arch)
Product: kwin
Version: 5.19.3
Platform: Archlinux Packages
OS: Linux
Status: REPORTED
Severity: major
Priority: NOR
Component: compositing
Assignee: kwin-bugs-n...@kde.org
Reporter: citaa...@gmail.com
Target Milestone: ---
SUMMARY
I have the original (2017) Gigabyte Aero 15X with a GTX 1070 Max-Q. I recently
updated my Nvidia drivers from 440.100 to 450.57. After some small issues with
the drivers not installing to the correct Kernel, the new Nvidia drivers seem
to work fine now. I can load into SDDM and i3 just fine, with the Nvidia module
loaded and active and all other applications are using the dedicated GPU just
fine, so I am certain now that this is not a driver/module issue. However, kwin
is completely broken.
Loading Plasma causes severe compositing issues. I got a gray screen with
different shades of gray where windows/task manager were open. Keyboard
shortcuts still opened new windows, and their titlebars were visible and
draggable, but contents were entirely gray. Resizing a window might flicker its
contents, but it's unusable. I was at least able to get a usable desktop by
changing the KWIN_COMPOSE environment variable. O2 or not set causes the above
behaviour. KWIN_COMPOSE=X or O2ES produce a mostly normal display, but there
are several compositing issues. Image artifiacts are left on screen, such as
when opening and closing the Application Launcher, or resizing windows.
Transparency also no longer works in applications that supported it before,
though this could be a different issue, as dragging windows are still
transparent. KWIN_COMPOSE=N to disable the compositor entirely works fine, but
of course, there are no compositing effects.
I should note in case it wasn't implied, I didn't have any of these issues when
using the 440 Nvidia driver, and I've tested several other applications with
this 450 driver and they appear to work fine, including those that use OpenGL,
or picom on i3. This is also not a problem when using integrated Intel graphics
with software rendering.
STEPS TO REPRODUCE
1. Upgrade to the Nvidia 450.57 driver
2. Launch kwin/plasma with default settings
OBSERVED RESULT
Plasma is unusable, mostly gray screen except for titlebars.
EXPECTED RESULT
Compositing works normally.
SOFTWARE/OS VERSIONS
Linux/KDE Plasma: Arch Linux, Kernel Ver. 5.7.8.arch1-1
KDE Plasma Version: 5.19.3-1
KDE Frameworks Version: 5.72.0-1
Qt Version: 5.15.0-4
ADDITIONAL INFORMATION
KWin Support Information:
https://pastebin.com/GbMXunS5
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