[Bug 100302] [GLK] Fifo underrun when changing resolution

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=100302

--- Comment #5 from Ander Conselvan de Oliveira <conselvan2 at gmail.com> ---
Created attachment 130742
  --> https://bugs.freedesktop.org/attachment.cgi?id=130742&action=edit
Workaround patch

I haven't been able to root cause the issue. The attached patch works around it
by disabling underrun reporting on the first frame when enabling the pipe
scaler.

I'm now also seeing an underrun with FBC, but that happens even without
changing resolution and goes away with i915.enable_fbc=0.

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