I was having dreadful problems on my HP Laptop with KDE4 or Compiz – jaggies, slow performance, difficulty switching tabs in Firefox, the whole experience was poor.  After a spot of Google trawling, I added these to the /etc/modprobe.conf.local on my installation of 11.0 (and 11.1)

#
# please add local extensions to this file
#

options nvidia NVreg_RegistryDwords=”PerfLevelSrc=0×2222″
options nvidia NVreg_Mobile=1

This was with a Geforce 8400M GS which shows up in lspci as:

05:00.0 VGA compatible controller: nVidia Corporation GeForce 8400M GS (rev a1)

The difference was pretty dramatic.  KDE 4.1is usable with KWin display effects turned on, tab switching is smooth and generally it’s pretty usable again.  All using the NVidia 177.82 driver.

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