[Bug 106341] CPU pipe A FIFO underrun on drm-tip

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=106341

--- Comment #4 from Ville Syrjala <ville.syrjala at linux.intel.com> ---
(In reply to Paulo Zanoni from comment #3)
> The bug is not in FBC. The bug is that we have a FIFO underrun. FBC plays on
> the safe side and disables itself in case we have a FIFO underrun.
> 
> We should fix the FIFO underrun. I've seen FIFO underruns everywhere,
> including in CI, so this is a known problem.

The fact that the flickering stops after FBC has been disabled may implicate
FBC. Do we have an option to force FBC to stay on despite underruns? That could
help in figuring out whether FBC is just the victim or the purpetrator.

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