[Bug 28670] New: some 2D apps way too slow, fast with noaccel (regression)

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=28670

           Summary: some 2D apps way too slow, fast with noaccel
                    (regression)
           Product: xorg
           Version: git
          Platform: x86-64 (AMD64)
        OS/Version: Linux (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: Driver/Radeon
        AssignedTo: xorg-driver-ati at lists.x.org
        ReportedBy: martinxyz at gmx.ch
         QAContact: xorg-team at lists.x.org


Original bugreport: https://gna.org/bugs/?16122 (Summary: zooming in MyPaint is
horribly slow, same with fading effects in Firefox)

Disabling acceleration (noaccel) solves the problem.
Chipset: "ATI Radeon X300 (RV370) 5B60 (PCIE)"
Bug 26225 looks very similar to this.

The ati/radeon module version 1.7.7 does not have this problem. The problem
exists in version 6.12.192 (debian testing package) and in current git.

I have tried to "git bisect" this but failed to build the older versions. The
problem was introduced somewhere between the 1.7.7 tag and commit 6990f2ac647
(dated 2009-09-08).

I'm using kernel 2.6.32-5-amd64. Please let me know if you need more
information.

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