Comment 8 for bug 164016

Try if it's working with:
echo mem > /sys/power/state

if not working, try
echo 1 > /proc/sys/kernel/acpi_video_flags
it can be different modes 1, 2, 3
more you can read here:

http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git;a=blob;f=Documentation/power/video.txt;h=2b358498d095b59d8ddf950b1c1ec109c2c6e7d8;hb=HEAD

Ist suspend working with kernel boot option nosmp?