https://bugs.kde.org/show_bug.cgi?id=523183
Bug ID: 523183
Summary: System freeze on battery power when changing
brightness via function key
Classification: Plasma
Product: plasmashell
Version First master
Reported In:
Platform: Other
OS: Linux
Status: REPORTED
Severity: normal
Priority: NOR
Component: Power management & brightness
Assignee: [email protected]
Reporter: [email protected]
Target Milestone: 1.0
DESCRIPTION
Pressing the brightness function key while running on battery power causes a
full system freeze requiring a hard reboot. The freeze does not occur on AC
power.
STEPS TO REPRODUCE
1. Unplug laptop from AC power, wait a few seconds
2. Press function key to lower display brightness
3. System freezes immediately, requires hard reboot.
OBSERVED RESULT
The system freezes completely. Unable to access tty. Hard reboot needed.
EXPECTED RESULT
Birghtness lowers normally.
SOFTWARE/OS VERSIONS
Laptop: Lenovo Yoga Pro 7 14ARP8 (model 83AU)
GPU: AMD Radeon 680M (Rembrandt iGPU)
OS: Fedora Linux 44 (KDE Plasma Desktop Edition)
Kernel: 7.1.3-201.fc44.x86_64
Plasma: 6.7.2 / KWin 6.7.2 (Wayland)
linux-firmware: 20260622-1.fc44
ddcutil: 2.2.1-3.fc44
ADDITIONAL INFORMATION
No relevant journalctl output appears at the moment of freeze from
plasma-powerdevil itself.
WORKAROUND
Disabling DDC/CI external-monitor brightness control resolves the freeze
entirely.
Added the following to my config:
kwriteconfig6 --file powerdevilrc --group AC --key DDCutilBrightnessControl
false
kwriteconfig6 --file powerdevilrc --group Battery --key
DDCutilBrightnessControl false
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