https://bugs.kde.org/show_bug.cgi?id=506650
Bug ID: 506650
Summary: Regression: HDMI signal lost on EDID change
Classification: Plasma
Product: kwin
Version First 6.4.2
Reported In:
Platform: Other
OS: Linux
Status: REPORTED
Severity: normal
Priority: NOR
Component: output configuration
Assignee: kwin-bugs-n...@kde.org
Reporter: ja...@okonski.org
CC: xaver.h...@kde.org
Target Milestone: ---
SUMMARY
I use an LG OLED TV connected to my RTX 4000 card on KDE 6.4.2 using Wayland.
When I toggle the VRR & G-sync option in the TV OSD, it broadcasts a different
EDID and
STEPS TO REPRODUCE
1. Set this HDMI TV as the only enabled output
2. Toggle the VRR switch to start/stop advertising VRR support
OBSERVED RESULT
Lose signal although `kscreen-doctor -o` still claims this display is enabled
and primary. The workaround is to use win+p, switch to another output and then
back
EXPECTED RESULT
VRR toggles but the display keeps working. This used to work as recently as the
6.3.x series I believe
SOFTWARE/OS VERSIONS
Operating System: NixOS 25.11
KDE Plasma Version: 6.4.2
KDE Frameworks Version: 6.15.0
Qt Version: 6.9.0
Nvidia 570 and 575 (tested both) on Linux 6.15.4 running Wayland
ADDITIONAL INFORMATION
journalctl logs:
```
Jul 05 21:26:45 vautera plasma_waitforname[129439]: org.kde.plasma.waitforname:
WaitForName: Service was not registered within timeout
Jul 05 21:26:45 vautera systemd[1411]: dbus-:1.2-org.kde.KSplash@13.service:
Main process exited, code=exited, status=1/FAILURE
Jul 05 21:26:45 vautera systemd[1411]: dbus-:1.2-org.kde.KSplash@13.service:
Failed with result 'exit-code'.
Jul 05 21:26:47 vautera kwin_wayland[2385]: kwin_wayland_drm: Atomic modeset
test failed! Invalid argument
Jul 05 21:26:47 vautera kwin_wayland[2385]: kwin_wayland_drm: Atomic modeset
test failed! Invalid argument
Jul 05 21:26:47 vautera kwin_wayland[2385]: kwin_xwl: Could not find a matching
X RandR CRTC/output to set as primary for KWin::DrmOutput(0x247a7990,
name="HDMI-A-1", geometry=QRect(0,0 3840x2160), scale=1)
```
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