[Bug 28992] New: 2d is extremely slow with kwin-compositing (bisected)

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=28992

           Summary: 2d is extremely slow with kwin-compositing (bisected)
           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: Henning.Fleddermann at gmx.net
         QAContact: xorg-team at lists.x.org


After updating to 6.13.1, things like opening a right-click menu or a
file-dialog (which fade in) became extremely slow. I bisected this to commit
30591320ec46e491ba20904cc64f3405b51c6505.
Author: Jerome Glisse <jglisse at redhat.com>
Date:   Fri May 7 17:35:09 2010 +0200

    kms: add support for the MSC swap & sync API

    This patch is mostly a port over of Intel ddx code for
    MSC support. It needs a radeon KMS module with version
    2.4 which has the query for hw crtc id.

    Signed-off-by: Jesse Barnes <jbarnes at virtuousgeek.org>
    Signed-off-by: Jerome Glisse <jglisse at redhat.com>

:040000 040000 8f59eb7c18b2137eb88e3305db5a776fab25bdad
ed1fb660478c944ebf849c5b0b4686f4bafd5e06 M      src

So apparently this is related to the swap&sync stuff. My card is a Radeon X1900
XT. Versions of other relevant software on my system: KDE 4.5 rc1, kernel
2.6.35-rc2, Xorg-Server 1.8.1.902.

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