I observer two additional phenomena on the same computer:

* Screensaver doesn't turn on. Screen just blinks when screensaver should be 
activated.
* When the power cord is detached, the screen goes black. I assume that the 
driver tries to lower the backlight, however I'm not sure whether the laptop 
has this functionality at all.

Is it possible that they have the same root cause?

-- 
System testing: cycle between video modes didn't happen
https://bugs.launchpad.net/bugs/437151
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