https://bugs.kde.org/show_bug.cgi?id=460288
Bug ID: 460288
Summary: second monitor image distorted on Wayland nouveau
output, but pointer OK
Classification: Plasma
Product: kwin
Version: 5.25.5
Platform: Archlinux
OS: Linux
Status: REPORTED
Severity: critical
Priority: NOR
Component: wayland-generic
Assignee: kwin-bugs-n...@kde.org
Reporter: vojt...@latal.name
Target Milestone: ---
Created attachment 152733
--> https://bugs.kde.org/attachment.cgi?id=152733&action=edit
photo of monitors
SUMMARY
Image produced by KWin on Wayland on nouveau output is distorted in kind of
"interlaced way". See attached screenshot and photo of monitors.
Note the mouse cursor/pointer is rendered OK. While background and windows are
not.
With Sway WM, it works flawlessly. The same with Wayfire. Plasma/X11 started
kernel panicking (no Magic SysRq working) lately, before it was OK.
KWin/Wayland worked for me several months ago with just a little bug:
It appeared the same as now upon startup, but to correct the second output I
had to do the following procedure:
1) Changing resolution to lower and then back to FullHD.
2) Move window from First screen to the second.
3) Voila! the output is corrected.
The procedure no longer fixes the output.
I have also tried attaching another monitor to another ouput of nouveau, the
image there was distorted the same way.
What I have tried and found the bug is not in:
* Plasma/X11 works even with second monitor
* Sway/Wayland & Wayfire/Wayland works even with second monitor
* Plasma/Wayland with only internal display (possibly Intel output) works
STEPS TO REPRODUCE
1. Have nvidia card with nouveau driver.
2. Start the "Plasma (Wayland)" through DM (SDDM).
3. Observer result.
OBSERVED RESULT
Distorted image produced on second and following outputs in kind of "interlaced
way". See attachments.
EXPECTED RESULT
Correct image produced on all outputs.
SOFTWARE/OS VERSIONS
Linux/KDE Plasma: Arch Linux up-to-date
Operating System: Arch Linux
KDE Plasma Version: 5.25.5
KDE Frameworks Version: 5.99.0
Qt Version: 5.15.6+kde+r177
Kernel Version: 5.19.13-zen1-1-zen (64-bit)
Graphics Platform: Wayland
Processors: 8 × Intel® Core™ i7-2760QM CPU @ 2.40GHz
Memory: 23,4 GiB of RAM
Graphics Processor: Mesa Intel® HD Graphics 3000
Manufacturer: LENOVO
Product Name: 4282CL7
System Version: ThinkPad W520
ADDITIONAL INFORMATION
$ lsmod | grep "nouv\|i915"
i915 3387392 63
drm_buddy 20480 1 i915
intel_gtt 28672 1 i915
nouveau 2904064 5
mxm_wmi 16384 1 nouveau
drm_ttm_helper 16384 1 nouveau
ttm 98304 3 drm_ttm_helper,i915,nouveau
drm_display_helper 192512 2 i915,nouveau
cec 90112 2 drm_display_helper,i915
wmi 40960 4 wmi_bmof,think_lmi,mxm_wmi,nouveau
video 61440 3 thinkpad_acpi,i915,nouveau
$ lspci | grep VGA
00:02.0 VGA compatible controller: Intel Corporation 2nd Generation Core
Processor Family Integrated Graphics Controller (rev 09)
01:00.0 VGA compatible controller: NVIDIA Corporation GF108GLM [Quadro 1000M]
(rev a1)
$ xrandr --listmonitors
Monitors: 2
0: +*XWAYLAND0 1920/340x1080/190+0+0 XWAYLAND0
1: +XWAYLAND1 1920/510x1080/290+1920+0 XWAYLAND1
$ xrandr --listproviders
Providers: number : 0
Feel free to ask for more details. I would love to help with that.
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