https://bugs.kde.org/show_bug.cgi?id=414921
--- Comment #2 from Ralph Moenchmeyer <r...@anracon.de> ---
"Solved" it. It had nothing to do with KDE. It is/was due to some xorg.conf
setting, which probably occurred during some Nvidia driver update.
The error information which put me in the right direction was
"The X11 connection broke: Unsupported extension used (code 2)"
I studied the xorg.conf and found a statement
Option "DPMS" "false"
in the Monitor section:
Section "Monitor"
Identifier "Monitor0"
VendorName "Unknown"
ModelName "DELL U2515H"
HorizSync 30.0 - 113.0
VertRefresh 56.0 - 86.0
Option "DPMS" "false"
Commenting the statement out or setting the option to "true" did the trick.
I do not exactly know why and since when the statement happened to be there.
Probably it has to do with a monitor mix in a Xinerama configuration.
Sorry to have bothered you.
At least I have learned that powerdevil needs monitor DPMS.
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