xorg intel drivers issues with kde effects unless xorg is restarted at logout

[Sergio Callegari]

On oneiric, with kde 4.7.2 and intel mobile 4 card.

Trying to enable kwin effects from system settings -> OK, works
Using effects -> OK, works
KDE logout + login -> xorg crashes, kdm restarts it, kde starts without effects

Conversely if kdm is configured to terminate the server at logout all is fine.

ProblemType: Bug
DistroRelease: Ubuntu 11.10
Package: xorg 1:7.6+7ubuntu7
ProcVersionSignature: Ubuntu 3.0.0-12.20-generic 3.0.4
Uname: Linux 3.0.0-12-generic x86_64
ApportVersion: 1.23-0ubuntu3
Architecture: amd64
Date: Sun Oct 16 19:25:36 2011
InstallationMedia: Kubuntu 9.10 "Karmic Koala" - Release amd64 (20091027)
SourcePackage: xorg
UpgradeStatus: Upgraded to oneiric on 2011-10-16 (0 days ago)