Comment 5 for bug 366156

I found a workaround for the problem described above (at least it works on my computer, too):
https://bugs.launchpad.net/ubuntu/+source/hal-info/+bug/217482

Make sure you have a recent /usr/share/hal/fdi/information/10freedesktop/20-video-quirk-pm-samsung.fdi (from hal-info package) installed.

Use "radeonfb" kernel module instead of "vesafb":
- add kernel boot option "video=radeonfb:mode_option=1024x768-16@60" (resolution might differ of course)
- add "radeonfb" entry in /etc/initramfs-tools/modules
- run update-grub and update-initramfs
- reboot