Am 31.08.20 um 09:23 wrote Stefan Krusche:
> I had the same problem. This command disables the power saving feature
> of the monitor/X-server completely:
>
> $ xset -dpms
>
> You also can set parameters for the time values. See man xset.
>
> This command will show you the current settings in seconds on your
> system (600s = 10m):

Thanks. It's a good idea to read man xset. I hate it to dependant on
graphical interfaces. xset -q showed me that the power manager which I
had installed didn't change the value.

Greetings Frank