Slow X after kernel update to 2.6.27.39 [SOLVED]

English Install/Boot/Login
1

As the title says. System is openSUSE 11.1 running KDE3.5 with KDE4.3 also installed to use desktop effects in KDE3.5.

After update X uses 90% CPU to scroll down a page in FF, OOo or even in text editor, either with KWin and KWin4. With KWin4 desktop effects can’t be enabled in system config.

From Xorg.conf:

Section "Device"
  BoardName    "ATI Radeon HD 3200 Graphics"
  Driver       "fglrx"
  Identifier   "Device[0]"
  Option       "XAANoOffscreenPixmaps" "true"
  Option       "Capabilities" "0x00000000"
  Option       "OpenGLOverlay" "off"
  Option       "FSAAScale" "0"
  Option       "FSAAEnable" "off"
  Option       "VideoOverlay" "on"
  Screen       0
  VendorName   "ATI"

Rolling back to kernel 2.6.27.37 fixed the problem.

2

In another machine with NVidia graphics there is no problem with the updated kernel. It seems to be related to the ATI graphics/driver.