[Bug 109376] FIFO underrun, visual glitches and instability with dual monitors

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=109376

--- Comment #15 from Lakshmi <lakshminarayana.vudum at intel.com> ---
(In reply to Ville Syrjala from comment #7)
> We seem to have fixed the original issue so I'm tempted to just close this
> bug.
> 
> However it might be interesting to know whether 4.19 and 4.20 are also
> affected. 4.18 is a lost cause since it's no longer maintained, but we might
> want to backport some of the fixes to 4.19 and 4.20. Can you test with
> 4.19/4.20?
> 
> In relation to bug 109248 Canonical identified commit ff43bc379e16
> ("drm/i915: Move ddb/wm programming into plane update/disable hooks on
> skl+") as fixing their flickering screen problems. We might be after the
> same thing here.

Ville, We have results from Kernel 4.20 and issue is reproducible. But we do
not have results yet from 4.19. Should we wait for 4.19 results before we close
this bug?

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