It turned out, that the graphics card was shutting down because it got
to hot. A proper flow of air was impeded because the holes of the tower
were not completely free.
** Changed in: xorg (Ubuntu)
Status: Incomplete = Invalid
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** Package changed: dasher (Ubuntu) = ubuntu
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https://bugs.launchpad.net/bugs/898761
Title:
Display falls into sleep after a bit of use in Unity but not in Unity
2D
To manage
In the meantime, it also happened while I was not running dasher; so it
probably is not dasher's fault. Thus, I removed dasher from the
affected package field.
Moreover, the problem also happened once in GNOME 3.
But, I never saw it in Unity 2D, though I have been using unity 2D quite
a lot
** Tags added: a11y
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https://bugs.launchpad.net/bugs/898761
Title:
Display falls into sleep after a bit of use in Unity but not in Unity
2D
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