[Bug 30872] New: With KMS, fading effect is unusably slow (recent regression)

[bugzilla-daemon at freedesktop.org]

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: xorg-driver-ati at lists.x.org
        ReportedBy: crosser at average.org
         QAContact: xorg-team at lists.x.org


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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