On my current system, connected via HDMI to a TV, I have used Plasma 5 and 6. I never had this problem with 5, but now with 6, the screen is dimming after some timeout (I’ve not set a stopwatch to find out how long it takes), despite all such power settings disabled. Moving the mouse does not “undim” it, I have to minimize the window, and wait some fraction of a second before restoring it, to make the brightness reset. Even active video (e.g. a game or a web browser showing animations or movies) doesn’t prevent this. Without regular typing or mouse movement, it dims. I’ve verfied that all the power-saving settings are disabled, and I’ve put POWERDEVIL_NO_DDCUTIL=1 in my environment to no effect. Where else can I look to possibly fix this? It’s quite annoying.
hi, welcome.
so you followed this procedure?
# to keep brightness levels from changing, disable brightness control slider in system tray
systemctl --user edit plasma-powerdevil.service
# add these two lines to the file that opens
[Service]
Environment=POWERDEVIL_NO_DDCUTIL=1
# save and logout
# to reverse, just delete the directory created at
~/.config/systemd/user/plasma-powerdevil.service.d
# add this package for stand alone GUI control of monitor settings
gddccontrol
and still having issues?
try using the GUI utility to check your monitor for it’s own powersaving settings that may be causing this behavior separate from plasma.
also might be worth considering the cable is bad.
No, I did not follow that procedure, as I’m not using systemd. Just thought I’d try it despite ddcutil claiming my screen doesn’t even support DDC. It’s not the monitor or the cable; as I said, everything worked fine before I upgraded to Plasma 6.