Closing again. In my case this was probably caused by a hardware
failure: the fan on the graphics card had died.

** Changed in: nvidia-graphics-drivers-180 (Ubuntu)
       Status: New => Invalid

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Display gets corrupted and garbled every 5-7 minutes when using compiz. VT 
switch which takes ~1min required to reset screen
https://bugs.launchpad.net/bugs/309739
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