Comment 7 for bug 1157458

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Chris Wilson (ickle) wrote : Re: visual glitch

The relevence of whether it is captured in a screenshot is that it gives a clue as to whereabout in the driver it fails - or rather it rules out several potential candidates. A GPU hang will indeed be first noticed by a stutter and be recorded in the kernel log - on your system, it should not require a reboot except in exceptional circumstances.

Not sure about the libreoffice glitch, that I would say is more likely to be a gui issue rather than driver, but you already have too many weirds things happening that one more wouldn't surprise me.