[Bug 42849] Screen flickering on dual screen

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=42849

--- Comment #12 from Alex Deucher <agd5f at yahoo.com> 2011-11-13 12:22:06 PST ---
(In reply to comment #11)
> > 
> > Sounds like it's data underruns in the displays.
> > 
> Be honest, I don't know what "data underruns" means. Could you clarify if this
> is software or hardware issue?

It means the memory controller is not able to keep the display FIFOs fed in
certain cases.  When the data isn't there, you might end up with a flicker or
stripes on the screen.  When you are doing heavy gfx work using the drawing
engine, there is bandwidth contention between the display pipes and the drawing
engine.  The disp_priority option makes display requests to the highest
priority in the memory controller.

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