[Intel-gfx] [PATCH] drm/i915/fbc: disable FBC on FIFO underruns

[Stefan Richter]

On Jun 13 Zanoni, Paulo R wrote:
> Em Seg, 2016-06-13 às 13:47 +0200, Stefan Richter escreveu:
> > On Jun 10 Paulo Zanoni wrote:  
> > > 
> > > Since my test machines don't produce FIFO underrun errors, I tested
> > > this by
> > > creating a debugfs file that just calls
> > > intel_fbc_handle_fifo_underrun(). I'd
> > > appreciate some Tested-by tags, if possible.  
> > Since May 8 I have been using 4.6.0-rc6 patched with
> > drm-intel-nightly_2016y-05m-06d-14h-29m-58s (from what I understand,
> > something close to what is now in mainline), and fbc disabled on the
> > kernel commandline.  I have not rebooted since May 8.  
> 
> Ok, so you're saying that if you boot this Kernel with i915.fbc=1, you
> won't get any FIFO underrun messages, but the system is still going to
> freeze somehow?

Yes.

> If that's the case, then this patch won't help.

Nevertheless I will try to test current mainline + your patch this week or
next week, just to be sure and to have another point of reference.
-- 
Stefan Richter
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