Recently, I guess after an update, my Manjaro KDE install on my Dell XPS 9570 started to fully use a CPU thread all the time, which of course drains the battery, and makes the computer hot and noisy.
The process using 100% of a thread was systemd-udevd, and I have narrowed the problem to a package: bluez-qt. From what I could gather, there is a bug which causes and endless loop, hence taking up a lot of CPU.
So far, I have tried to roll back to the latest LTS kernel (5.4.74-1), disabled the bluetooth from the BIOS (still disabled now), removing the package bluez and bluez-qt (with pacman -Rdd, in order not to remove dependancies such as powerdevil). It seems that only removing the last one (bluez-qt) has an effect, and make the process using a lot of CPU vanish. If I had to renounce to bluetooth on my laptop, it would not be a problem, since I never used it in more than 2 years, but the problem is that for some reason, uninstalling bluez-qt breaks a dependency, and basically I cannot access the power option anymore (I can’t set the time after which the computer suspends, etc).
When I go to the Power Management settings in KDE Plasma, here’s the error I get: Cannot load library /usr/lib/qt/plugins/kcm_powerdevilactivitiesconfig.so: (libKF5BluezQt.so.6: cannot open shared object file: No such file or directory)
Could it be possible to bypass that in order to continue to have access to these settings, which are fairly important? Thanks in advance!
Also, if it helps you: the battery icon disappears from the system tray applet in a panel, but I can still access the battery percentage via the specific battery indicator widget, and I can still access the energy consumption too.