[Bug 52330] Triple monitor desktop intermittent slow updates

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=52330

--- Comment #4 from Michel Dänzer <michel at daenzer.net> 2012-07-31 17:50:18 UTC ---
(In reply to comment #2)
> When there is a software fallback the pixmap where fallback has to be handled
> has to be migrated into CPU accessible memory and the larger the pixmap, the
> more data has to be migrated.  That's why it's more noticeable when you have a
> larger desktop.

That doesn't explain why switching to a smaller (or supposedly even bigger?)
desktop and back, or even just re-setting the (supposedly) same size, seems to
improve performance.

Submitter, can you attach your xorg.conf file? It seems like you're using
rotation, maybe that isn't taken into account correctly for the initial front
buffer size:

(II) RADEON(0): Front buffer size: 40000K

That matches 2560x1600 + 2*1920x1080, not + 2*1080x1920.

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