https://bugs.kde.org/show_bug.cgi?id=477016
Bug ID: 477016
Summary: VRR always enabled in full-screen, ignores/overrides
drirc.d config
Classification: Plasma
Product: kwin
Version: 5.27.9
Platform: Archlinux
OS: Linux
Status: REPORTED
Severity: normal
Priority: NOR
Component: platform-drm
Assignee: kwin-bugs-n...@kde.org
Reporter: mequer...@gmail.com
Target Milestone: ---
When adaptive sync / VRR is set to "Automatic" in "Display Configuration", it's
always enabled in full-screen programs, even when `adaptive_sync` is set to
`false` for that particular program in
`/usr/share/drirc.d/00-mesa-defaults.conf`. E.g. adaptive sync is blocked by
default for Firefox in `00-mesa-defaults.conf`, but adaptive sync still gets
enabled when setting Firefox to full-screen in KDE. Because of this, moving
(and stopping) the cursor in full-screen mode in Firefox causes the refresh
rate to rapidly fluctuate between the lowest refresh rate (e.g. 48 Hz) and
highest refresh rate (e.g. 240 Hz). This causes a lot of brightness flickering
on VA monitors (and possibly some IPS monitors as well). There also doesn't
seem to be a way in KDE to disable VRR for a specific program. The only related
rule property that can be added in "Window Rules" is to block compositing,
which doesn't help.
So two problems:
1. KDE seems to ignore `/usr/share/drirc.d/*.conf`, at least for
`adaptive_sync`. Is this a KDE bug or is there a problem somewhere else?
2. KDE doesn't have any way to force disable (nor enable) VRR just for a
specific program. Adding an "adaptive sync" rule property to "Window Rules"
seems like a simple solution.
SOFTWARE/OS VERSIONS
KDE Plasma Version: 5.27.9
KDE Frameworks Version: 5.112.0
Qt Version: 5.15.11
Kernel Version: 6.6.1-arch1-1 (64-bit)
Graphics Platform: Wayland
Graphics Processor: AMD Radeon RX 6650 XT (driver: amdgpu)
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