https://bugs.kde.org/show_bug.cgi?id=462712
Bug ID: 462712
Summary: DRM: Allow to specify the output BPC
Classification: Plasma
Product: kwin
Version: master
Platform: Other
OS: Linux
Status: REPORTED
Severity: normal
Priority: NOR
Component: platform-drm
Assignee: kwin-bugs-n...@kde.org
Reporter: niels_...@salscheider-online.de
Target Milestone: ---
SUMMARY
***
I have a projector connected to my RX480 over HDMI which I use with
kwin_wayland.
When I connect the projector, kwin_wayland configures the output with the
following settings:
- 3840 x 2160 resolution
- 60 Hz refresh rate
- 10 bpc (instead of 8 bpc)
- No chroma subsampling (YUV444 instead of YUV420)
The HDMI port of the GPU supports HDMI 2.0b. I think the bandwidth of that
output is enough to support any 3 of the 4 settings, but not all 4 at once.
With the default settings the display stays just black (it works fine with
another computer that has a newer GPU). If I reduce the resolution or the
refresh rate the display lights up.
I would however prefer to reduce the BPC of the connection since my input
anyway only has 8 bpc. Please make this configurable.
***
STEPS TO REPRODUCE
1. Connect a display that supports 4K, 60Hz, 10bpc to an HDMI 2.0b port.
OBSERVED RESULT
The default configuration results in a black screen, I can only change the
resolution or refresh rate to fix it.
EXPECTED RESULT
The default configuration should work. The BPC of the output configuration
should be adjustable.
SOFTWARE/OS VERSIONS
Linux/KDE Plasma:
KDE Plasma Version: 5.26.4
KDE Frameworks Version: 5.100.0
Qt Version: 5.15.7
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