[Bug 102221] [SKL] GPU HANG on rcs0 on Intel i915 on drm-tip

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=102221

Imre Deak <imre.deak at intel.com> changed:

           What    |Removed                     |Added
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                 CC|                            |imre.deak at intel.com

--- Comment #8 from Imre Deak <imre.deak at intel.com> ---
(In reply to Elizabeth from comment #7)
> (In reply to Imre Deak from comment #4)
> > (In reply to Chris Wilson from comment #2)
> > > No, extra drm.debug is not required. Looks like it didn't send the final
> > > context-switch interrupt.
> > > 
> > > Reasonable suspicion laid on
> > 
> > Looks like a known DMC firmware bug, where toggling DC6 enabled state can
> > corrupt registers backed by DC6 power context. There is an internal bug
> > ticket opened for this, I'm planning to provide more debug info to the
> > firmware team and convince them to fix it.
> > 
> > One register that can get corrupted is GEN8_MASTER_IRQ leaving all i915
> > interrupts disabled, that would also explain the missing ctx switch
> > interrupt.
> > ...
> Hello Imre, any relevant update for this bug that can be shared at FDO?
> Thank you.

The firmware version with the fix is planned to be released next week, so stay
tuned:)

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