On Sep 20, 2016 7:31 AM, "Dusty Mabe" <du...@dustymabe.com> wrote:
> Several times over the past month my t460s has just blank screens
> when I come back to it after some time. I don't know if the thing
> froze up completely or if it is just the display not working. I lock
> my screens (laptop + 2 external monitors) and then leave for an hour
> or so. When I come back no attempt at input will get the lockscreen
> to appear. I have to power down and then back up.
> After boot I look at the journal and I always tend to see some of
> these:
> [drm:intel_cpu_fifo_underrun_irq_handler [i915]] *ERROR* CPU pipe A FIFO

Sadly, i915 has had issues on and off with Skylake.

> [drm:intel_pipe_update_end [i915]] *ERROR* Atomic update failure on pipe
C (start=167156 end=167157) time 146 us, min 1073, max 1079, scanline start
1072, end 1082

This smells like a bug that was fixed in the 4.8 series a bit late IIRC.
Search for i915 SAGV.
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