https://bugs.kde.org/show_bug.cgi?id=500835
Bug ID: 500835
Summary: powerdevil high CPU usage with ddcutil 2.2.0
Classification: Plasma
Product: plasmashell
Version: 6.3.2
Platform: Gentoo Packages
OS: Linux
Status: REPORTED
Severity: normal
Priority: NOR
Component: Power management & brightness
Assignee: plasma-b...@kde.org
Reporter: anhollander...@gmail.com
Target Milestone: 1.0
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SUMMARY
Powerdevil's CPU usage spikes every second or so with ddcutil 2.2.0.
Downgrading to ddcutil 2.1.4 and restarting the service solved the problem.
STEPS TO REPRODUCE
1. Upgrade to ddcutil 2.2.0
2. Restart powerdevil
OBSERVED RESULT
Powerdevil has relatively high CPU usage
EXPECTED RESULT
Powerdevil works as expected
SOFTWARE/OS VERSIONS
Operating System: Gentoo Linux 2.17
KDE Plasma Version: 6.3.2
KDE Frameworks Version: 6.11.0
Qt Version: 6.8.2
Kernel Version: 6.13.5-tkg-sched-ext-latency (64-bit)
Graphics Platform: Wayland
Processors: 12 × AMD Ryzen 5 5600G with Radeon Graphics
Memory: 15.4 GiB of RAM
Graphics Processor: AMD Radeon RX 6600
ADDITIONAL INFORMATION
Log with ddcutil 2.1.4:
Feb 26 19:25:22 buildbox systemd[752]: Starting Powerdevil...
Feb 26 19:25:22 buildbox org_kde_powerdevil[1046]: Initializing libddcutil.
ddcutil version: 2.1.4, shared library: /usr/lib64/libddcutil.so.5.1.2
Feb 26 19:25:22 buildbox org_kde_powerdevil[1046]: Options passed from client:
Feb 26 19:25:22 buildbox org_kde_powerdevil[1046]: Applying combined options:
Feb 26 19:25:22 buildbox org_kde_powerdevil[1046]: Library initialization
complete.
Log with ddcutil 2.2.0:
Feb 27 15:01:47 buildbox systemd[750]: Starting Powerdevil...
Feb 27 15:01:47 buildbox org_kde_powerdevil[1043]: Starting libddcutil. library
built Feb 27 2025 at 10:54:40. stdout_stderr_redirected=true
Feb 27 15:01:47 buildbox org_kde_powerdevil[1043]: Initializing libddcutil.
ddcutil version: 2.2.0, shared library: /usr/lib64/libddcutil.so.5.2.0
Feb 27 15:01:47 buildbox org_kde_powerdevil[1043]: [ 1043] Options passed from
client:
Feb 27 15:01:47 buildbox org_kde_powerdevil[1043]: [ 1043] Applying combined
libddcutil options:
Feb 27 15:01:48 buildbox org_kde_powerdevil[1043]: Library initialization
complete.
Feb 27 15:01:48 buildbox org_kde_powerdevil[1043]: [ 1043] Watching for
display connection changes, resolved watch mode = Watch_Mode_Poll, poll loop
interval = 2000 millisec
Feb 27 15:01:48 buildbox org_kde_powerdevil[1043]: [ 1043]
extra_stabilization_millisec: 0,
stabilization_poll_millisec: 100
Feb 27 15:01:48 buildbox org_kde_powerdevil[1043]: [ 1043] libddcutil recheck
thread (nil) started
Feb 27 15:01:48 buildbox org_kde_powerdevil[1043]: [ 1043] libddcutil watch
thread 0x5e7452737fe0 started
Feb 27 15:01:48 buildbox org_kde_powerdevil[1043]: [ 1173]
(dw_recheck_displays_func) Recheck interval: Slept for 200 millisec
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