https://bugs.freedesktop.org/show_bug.cgi?id=30872
Summary: With KMS, fading effect is unusably slow (recent
regression)
Product: xorg
Version: 7.5
Platform: All
OS/Version: Linux (All)
Status: NEW
Severity: normal
Priority: medium
Component: Driver/Radeon
AssignedTo: [email protected]
ReportedBy: [email protected]
QAContact: [email protected]
Some time late in Ubuntu Maverick 'alpha' period, visual effects that involve
"fading" became unusably slow. The following javascript web slideshow, when
viewed with Firefox, makes this effect very obvious:
http://www.electricprism.com/aeron/slideshow/example1.html
but it is also apparent with e.g. F-Spot slideshow.
Disabling KMS by adding "radeon.modeset=0" to the kernel command line makes the
problem go away.
The current version of X server on which I can reproduce the problem is
1:7.5+6ubuntu3. I observed the effect on three different machines with
different Radeon models.
It looks somewhat similar to the bug #23513, but in my case, 3D performance is
unaffected.
I can provide more information on request, though in fact I think that anyone
can reproduce it at will; I see it when I boot from "live USB" containing
Maverick.
Eugene
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