https://bugs.kde.org/show_bug.cgi?id=514957
Bug ID: 514957
Summary: HDR Tonemapping issues on "Prefer Color Accuracy" mode
in Color Accuracy settings
Classification: Plasma
Product: kwin
Version First unspecified
Reported In:
Platform: CachyOS
OS: Linux
Status: REPORTED
Severity: normal
Priority: NOR
Component: colour-management
Assignee: [email protected]
Reporter: [email protected]
CC: [email protected]
Target Milestone: ---
On launching a game using PROTON_ENABLE_WAYLAND=1 and PROTON_ENABLE_HDR=1, HDR
works as intended *unless* your KDE color settings are set to "Prefer Color
Accuracy." When using "Prefer Efficiency," the game produces HDR content
correctly to the screen, but upon entering a menu (I.E. Elden Ring inventory
screen and settings menus), the game reverts the highlights to being clamped.
Disabling Tonemapping using KWIN_DISABLE_TONEMAPPING=1 in environment settings
fixes the issue by disabling the tonemapper entirely.
STEPS TO REPRODUCE
1. Open Display Configuration system settings
2. Set "Color Accuracy" to "Prefer Color Accuracy"
3. Open a game that supports HDR output (Elden Ring: Nightreign was a good
testing example for me due to the giant Grace in the middle of the starting
room being a large highlight that pushes peak brightness)
OBSERVED RESULT:
The highlights are washed out, not pushing peak brightness, as they do when
using Efficiency mode.
EXPECTED RESULT
Highlights and other peak-brightness-pushing elements push the peak brightness
set by the monitor's config regardless of color accuracy mode
SOFTWARE/OS VERSIONS:
CachyOS using KDE Plasma:
KDE Plasma Version: 6.5.5
KDE Frameworks Version: 6.22.0
Qt Version: 6.10.1
ADDITIONAL INFORMATION
Efficiency mode incorrectly raises black levels by a noticeable amount on my
OLED monitor, regardless of brightness settings. The only fix to this for me is
to set Prefer Color Accuracy as the setting for color accuracy, but doing so
breaks the HDR output in-game. Additionally, using Efficiency and then trying
to enable HDR through gamescope results in the same brightness issues, whereas
PROTON_ENABLE_WAYLAND=1 and PROTON_ENABLE_HDR=1 work fine.
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