https://bugs.kde.org/show_bug.cgi?id=513601
Bug ID: 513601
Summary: kwin choose higher refresh rate not support by default
Classification: Plasma
Product: kwin
Version First 6.5.4
Reported In:
Platform: Kubuntu
OS: Linux
Status: REPORTED
Severity: critical
Priority: NOR
Component: output configuration
Assignee: [email protected]
Reporter: [email protected]
CC: [email protected]
Target Milestone: ---
Product: kwin
Component: wayland
Version: 6.5.4
SUMMARY
On a system with an Intel i5-3470 (Ivy Bridge iGPU) running Kubuntu 25.10, KWin
automatically selects 75Hz as the default refresh rate for a 1024x768 monitor
connected via VGA. This causes the monitor to display an "Out of Range" error
immediately upon login. While the monitor's EDID seems to incorrectly advertise
70Hz and 75Hz as supported, KWin chooses the highest available rate instead of
a safe 60Hz default, rendering the system unusable without manual TTY
intervention.
STEPS TO REPRODUCE
Connect a 1024x768 monitor via VGA to an Intel i5-3470 system.
Boot into Kubuntu 25.10 (Plasma 6.5.4).
Log in to the desktop session.
OBSERVED RESULT
The monitor immediately goes black and displays "Out of Range" because KWin has
defaulted to 75Hz.
EXPECTED RESULT
KWin should either default to a safer 60Hz or provide a failsafe
mechanism/cooldown period where it reverts to the previous setting if the user
cannot confirm the new refresh rate.
SOFTWARE/OS VERSIONS
Linux/KDE Plasma: Kubuntu 25.10
KDE Plasma Version: 6.5.4
Windowing System: Wayland
ADDITIONAL INFORMATION
GPU: Intel HD Graphics 2500 (i5-3470)
Connection: VGA
Resolution: 1024x768
Note: The monitor's EDID is likely faulty as it claims to support 75Hz, but the
OS should allow a way to force or prioritize 60Hz to prevent "Out of Range"
lockouts.
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