The workaround to restart lightdm makes me think this *may* be lightdm-
related. I'll try and gather some logs next time I get a low graphics
mode message and post them here.
** Also affects: lightdm
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/1070150
Title:
Intermittent low graphics mode with Intel HD graphics
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