Comment 8 for bug 21440

Preceding comment is about a guy using Gentoo, not Ubuntu.
Unless you are pretty at ease with this kind of stuff, you should probably wait package maintainer opinion.

Also, giving the usual information should help.

Typing the following in a Terminal (console) [after the bug happened]:
cd
mkdir bug21440
cd bug 21440
uname -a > DR_uname.txt
lspci -vvnn > DR_lspci.txt
lsmod > DR_lsmod.txt
cat /etc/default/acpi-support > DR_etc_default_support.txt
dmesg > DR_dmesg.txt

And then attaching each of the file in the bug21440 directory inside your home directory to this bug report, should help
better diagnose the problem.

Thank you for taking time to report bugs and making Ubuntu better!