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 <email@example.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 <firstname.lastname@example.org>
Signed-off-by: Jerome Glisse <email@example.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 18.104.22.1682.
Is this still an issue with current software versions?
I am only on CC, but I think that this is not an issue any more at least for me.