Bug 511394 - Brightness option stops working after waking from sleep (Powerdevil)
Summary: Brightness option stops working after waking from sleep (Powerdevil)
Status: REPORTED
Alias: None
Product: plasmashell
Classification: Plasma
Component: Power management & brightness (other bugs)
Version First Reported In: 6.5.0
Platform: EndeavourOS Linux
: NOR normal
Target Milestone: 1.0
Assignee: Plasma Bugs List
URL:
Keywords:
Depends on:
Blocks:
 
Reported: 2025-10-30 19:15 UTC by angel
Modified: 2025-10-30 19:15 UTC (History)
0 users

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Description angel 2025-10-30 19:15:45 UTC 
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.