[Bug 107724] [CI] [BAT] [DRMTIP] igt@* - dmesg-warn / dmesg-fail - *ERROR* CPU pipe [ABC] FIFO underrun

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=107724

--- Comment #23 from Martin Peres <martin.peres at free.fr> ---
Ville has been working on it, and he has patches addressing the issue:
https://patchwork.freedesktop.org/series/58299/

They are not landed because IGT does not cope well with the additional
restrictions on plane size. The IGT test fixes are coming along, and we can
expect to close this issue in the coming week or so.

The customer impact of this issue is very high as this could lead to transient
black screens / flickering, due to exceeding the memory bandwidth available to
the display controller.

To fix these issues for good, a test is being developed by Stan to stress-test
watermark selection, which will hopefully allow us to iron out the final kinks
and make FIFO underruns a thing of the past.

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