[Bug 95063] [SKL] random system hang with RC6 enabled

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=95063

--- Comment #30 from Tomas Janousek <tomi at nomi.cz> ---
Hi,

(In reply to Lakshmi from comment #28)
> There are few bugs related to this error (FIFO underrun) are open and few
> are closed as it got resolved with the latest drm-tip.
> Can you please elaborate the issue like what are steps that caused this
> error? What is the impact of this error? 
> Also, have you verified this issue with latest drm-tip?

I've only experienced it a few times, it happens cca once a month, and always
it's docked, driving 2 external screens and the eDP display. When I leave it
like this for a while and DPMS kicks in, there's a small chance that when I
later try to log back in, one of the displays won't come back online and then I
usually have a few seconds until the machine freezes completely. Yesterday I
managed a "sync" before that happened, so this dmesg snippet is all I have now.

I turned DPMS off as a workaround but I'll try to get to testing drm-tip sooner
or later.

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