https://bugs.kde.org/show_bug.cgi?id=511394
Bug ID: 511394
Summary: Brightness option stops working after waking from
sleep (Powerdevil)
Classification: Plasma
Product: plasmashell
Version First 6.5.0
Reported In:
Platform: EndeavourOS
OS: Linux
Status: REPORTED
Severity: normal
Priority: NOR
Component: Power management & brightness
Assignee: [email protected]
Reporter: [email protected]
Target Milestone: 1.0
Hi, I have been having an issue that I recognised mostly when I leave my PC to
go to sleep naturally. After turning it back on and logging on, the brightness
option seems to disappear. I have found this is linked to the powerdevil
service and that appears to die for some reason, I can't pinpoint why.
STEPS TO REPRODUCE
1. Change settings so PC goes to sleep by itself.
2. Wait for screen to go black and you are logged out
3. Wake PC up (login screen should only have option to switch user) and login
OBSERVED RESULT
No Brightness option is system tray is visible
EXPECTED RESULT
Brightness option should be visible in system tray
SOFTWARE/OS VERSIONS
Operating System: EndeavourOS
KDE Plasma Version: 6.5.0
KDE Frameworks Version: 6.19.0
Qt Version: 6.10.0
Kernel Version: 6.12.55-1-lts (64-bit)
Graphics Platform: Wayland
Processors: 12 × AMD Ryzen 5 5600X 6-Core Processor
Memory: 32 GiB of RAM (31.3 GiB usable)
Graphics Processor: AMD Radeon RX 7800 XT
ADDITIONAL INFORMATION
Powerdevil service:
○ plasma-powerdevil.service - Powerdevil
Loaded: loaded (/usr/lib/systemd/user/plasma-powerdevil.service; static)
Active: inactive (dead) since Thu 2025-10-30 18:22:25 GMT;
Duration: 44min 15.315s
Invocation: 8004e8cd57774df6ae46127c8cfa744a
Process: 1264 ExecStart=/usr/lib/org_kde_powerdevil (code=killed,
signal=TERM)
Main PID: 1264 (code=killed, signal=TERM)
Mem peak: 12.7M
CPU: 2.018s
Oct 30 18:22:24 endeavour org_kde_powerdevil[1264]: Failed to write to the
pipe: Bad file descriptor.
Oct 30 18:22:24 endeavour org_kde_powerdevil[1264]: There are no outputs -
creating placeholder screen
Oct 30 18:22:24 endeavour org_kde_powerdevil[1264]: X connection to :1 broken
(explicit kill or server shutdown).
Oct 30 18:22:24 endeavour org_kde_powerdevil[1264]: QtDBus: cannot relay
signals from parent QObject(0x5772a131b080 "") unless they are emitted in the
object's thread QThread(0x5772a12fe400 "Qt mainThread"). Current thread is
QThread(0x5772a13ad470 "").
Oct 30 18:22:24 endeavour org_kde_powerdevil[1264]: QSocketNotifier: Socket
notifiers cannot be enabled or disabled from another thread
Oct 30 18:22:24 endeavour org_kde_powerdevil[1264]: [ 4004] Watch thread
terminated.
Oct 30 18:22:24 endeavour org_kde_powerdevil[1264]: QMutex: destroying locked
mutex
Oct 30 18:22:24 endeavour org_kde_powerdevil[1264]: [ 4003] recheck thread
terminating because watch thread terminated
Oct 30 18:22:25 endeavour org_kde_powerdevil[1264]: [DDCutilDisplay]:
ddca_get_non_table_vcp_value -3007
Oct 30 18:22:25 endeavour systemd[866]: plasma-powerdevil.service: Consumed
2.018s CPU time, 12.7M memory peak.
Additionally, the brightness seems to be different from what the actually
brightness level is, not sure if this is related.
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