Installing packages from https://launchpad.net/~ubuntu-x-swat/+archive/x-updates/ fixed my problems with white screen at reboot/shutdown on my M1330 with Ubuntu 9.04.
Installing packages from https:/ /launchpad. net/~ubuntu- x-swat/ +archive/ x-updates/ fixed my problems with white screen at reboot/shutdown on my M1330 with Ubuntu 9.04.