https://bugs.kde.org/show_bug.cgi?id=506831
Bug ID: 506831
Summary: Wayland session hard-freezes with ASUS XG27ACDNG when
using DisplayPort 1.4 or enabling HDR
Classification: Plasma
Product: kwin
Version First 6.4.2
Reported In:
Platform: Arch Linux
OS: Linux
Status: REPORTED
Severity: crash
Priority: NOR
Component: compositing
Assignee: [email protected]
Reporter: [email protected]
Target Milestone: ---
SUMMARY
Plasma Wayland session hard crashes (full system lockup) when using the ASUS
XG27ACDNG monitor with DisplayPort 1.4 or when HDR is enabled. System is
completely unresponsive, even to TTY. Issue only occurs on Wayland; X11 works
fine.
STEPS TO REPRODUCE
1. Set monitor (ASUS XG27ACDNG) DisplayPort mode to 1.4 in monitor OSD
2. Attempt to log in to a Wayland session via SDDM or TTY (startplasma-wayland)
3. If DisplayPort 1.2 is used instead, log in and then enable HDR via KDE
System Settings
OBSERVED RESULT
With DP 1.4: After attempting to start a Wayland session, the screen goes black
and the entire system hard-freezes (requires physical reboot - no TTY
available).
With DP 1.2 + HDR enabled: Wayland session hard-freezes in the same way after
toggling HDR.
With DP 1.2 and HDR disabled: Wayland session works, but refresh rate is
limited to 179.96Hz, and HDR functionality is lost.
EXPECTED RESULT
Plasma Wayland session should successfully initialize and remain stable with
DisplayPort 1.4 and HDR enabled. High refresh rates (360Hz) and HDR should
function without freezing the system.
SOFTWARE/OS VERSIONS
Operating System: EndeavourOS
KDE Plasma Version: 6.4.2
KDE Frameworks Version: 6.15.0
Qt Version: 6.9.1
Kernel Version: 6.15.5-arch1-1 (64-bit)
Graphics Platform: Wayland
Processors: 24 × AMD Ryzen 9 7900X 12-Core Processor
Memory: 96 GiB of RAM (93.4 GiB usable)
Graphics Processor 1: NVIDIA GeForce RTX 4080/PCIe/SSE2
Graphics Processor 2: NVIDIA GeForce RTX 4080/PCIe/SSE2
ADDITIONAL INFORMATION
Problem began immediately after switching from an older monitor to the
XG27ACDNG.
X11 sessions work without issue at 360Hz and with HDR enabled.
Using Wayland, switching the monitor’s DP spec from 1.4 to 1.2 prevents
crashes, but reduces refresh rate to 179.96Hz and disables HDR.
Issue appears to be specific to the combination of:
-NVIDIA 575.64.03 driver
-DisplayPort 1.4
-HDR
-Wayland session on Plasma 6.4.2
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