SUMMARY *** Powerdevil updated to 5.27.9-2 with ddcutil to 2.0.0-1. Update was 2 days ago. The Power module is broken every since. Using journalctl I got the following for you. "org.kde.powerdevil: org.kde.powerdevil.chargethresholdhelper.getthreshold failed “Charge thresholds are not supported by the kernel for this hardware” Oct 30 10:51:46 attish-archLinux org_kde_powerdevil[3705]: org.kde.powerdevil: org.kde.powerdevil.backlighthelper.brightness failed Oct 30 10:51:51 attish-archLinux systemd[901]: plasma-powerdevil.service: start operation timed out. Terminating. Oct 30 10:51:51 attish-archLinux systemd[901]: plasma-powerdevil.service: Failed with result ‘timeout’. Oct 30 10:51:51 attish-archLinux systemd[901]: plasma-powerdevil.service: Consumed 1.745s CPU time. Oct 30 10:51:51 attish-archLinux systemd[901]: plasma-powerdevil.service: Scheduled restart job, restart counter is at 46." This restart loop never ends. Downgrading to previous versions work. After downgrade, this is what pacman spits out after using pacman -Syu so you know which version I am using currently. warning: ddcutil: ignoring package upgrade (1.4.1-1 => 2.0.0-1) warning: powerdevil: ignoring package upgrade (5.27.8-2 => 5.27.9-2) *** STEPS TO REPRODUCE 1. Upgrade ddcutil and powerdevil to the versions that I have stated above. OBSERVED RESULT The power devil service always crashes and tries to restart itself and whenever it does, it freezes the computer for a second. Restart loop causes this every 5 or so seconds. EXPECTED RESULT The power devil module and service should work fine after update and the power module should be loaded in System Settings SOFTWARE/OS VERSIONS Windows: macOS: Linux/KDE Plasma: (available in About System) KDE Plasma Version: 5.27.9 KDE Frameworks Version: 5.111.0 Qt Version: 5.15.11 ADDITIONAL INFORMATION In order to make it work I have to use the following commands: killall org_kde_powerdevil kstart5 /usr/lib/org_kde_powerdevil It spits out: org.kde.powerdevil: org.kde.powerdevil.chargethresholdhelper.getthreshold failed “Charge thresholds are not supported by the kernel for this hardware” org.kde.powerdevil: org.kde.powerdevil.backlighthelper.brightness failed org.kde.powerdevil: Handle button events action could not check for screen configuration org.kde.powerdevil: org.kde.powerdevil.chargethresholdhelper.getthreshold failed “Charge thresholds are not supported by the kernel for this hardware” The restart loop breaks this way.
Similar to bug https://bugs.kde.org/show_bug.cgi?id=476375 I had to downgrade both ddcutil and powerdevil to get it to work again. The last known working combination is: ddcutil-1.4.1-1 (downgraded from ddcutil-2.0.0-1) powerdevil-5.27.9-1 (downgraded from powerdevil-5.27.9-2) sudo pacman -U https://archive.archlinux.org/packages/d/ddcutil/ddcutil-1.4.1-1-x86_64.pkg.tar.zst https://archive.archlinux.org/packages/p/powerdevil/powerdevil-5.27.9-1-x86_64.pkg.tar.zst
*** This bug has been marked as a duplicate of bug 476375 ***