The Curse of the Mad Power-Saver

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This is F16 fully updated, under KDE (ditto). For no readily apparent
reason my monitor goes black, and shortly thereafter enters power-saving
mode. Looks like a screensaver, right? However:

It only happens under KDE.

It doesn't happen in every session, just sometimes.

When it happens, the timeout before blanking the monitor is on the order
of 2 to 3 seconds, making it impossible to use the system without
constantly jiggling the mouse.

KDE Settings (unchanged since F15 and earlier, when this problem did not
exist) have the screensaver OFF. Also the Power-save profile is set to
Performance with timers unset.

The machine is an always on desktop (Intel Mobo, Intel graphics). The
monitor is a Flatron W2243S.

Some insight would be appreciated.

poc

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