https://bugs.kde.org/show_bug.cgi?id=478658
Bug ID: 478658
Summary: LG 27gl850 is falsely detected as Vrr: incapable
Classification: Plasma
Product: KScreen
Version: 5.90.0
Platform: Other
OS: Linux
Status: REPORTED
Severity: normal
Priority: NOR
Component: common
Assignee: kscreen-bugs-n...@kde.org
Reporter: chrno-sphe...@hotmail.com
Target Milestone: ---
Created attachment 164256
--> https://bugs.kde.org/attachment.cgi?id=164256&action=edit
output of kscreen-doctor --outputs
SUMMARY
***
This is the first time I'm trying to get VRR working on linux and wayland, so
I'm not sure where to look.
I have an LG 27gl850 Monitor which is Freesync capable according to AMD itself
[1]. I read there is supposed to be a toggle to enable VRR for the monitor in
display settings, but there is none. kscreen-doctor reports "Vrr: incapable"
both over HDMI and DisplayPort (via HP Thunderbolt Dock G4). The monitor OSD
displays "Adaptive-Sync: ON".
***
STEPS TO REPRODUCE
1. Connect via DisplayPort (or HDMI)
2. Make sure FreeSync Premium is enabled in Monitor internal settings (Menu ->
Game Adjust -> Adaptive-Sync -> On)
3. Run kscreen-doctor --outputs
OBSERVED RESULT
The monitor is listed as "Vrr: incapable" both via HDMI and DisplayPort
EXPECTED RESULT
The monitor should be listed as "Vrr: capable/enabled", I guess?
SOFTWARE/OS VERSIONS
Linux/KDE Plasma: arch linux
KDE Plasma Version: 5.90 (Beta 1)
KDE Frameworks Version: 5.246.0
Qt Version: 6.6.1
ADDITIONAL INFORMATION
I am not sure if this is something on kscreen or drm side, attaching both
output of kscreen-doctor and drm_info while the monitor is attached via
DisplayPort.
[1]
https://www.amd.com/en/products/graphics/technologies/freesync/monitors.html
(page 3 if you filter by manufacturer -> LG)
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