Comment 5 for bug 362816

Ubuntu 9.10 Karmic Koala also suffers from this bug. However, the workaround I applied in 9.04 (mentioned in the first post in this thread) causes kernel instability in 9.10. I found out, that this was because I put the blacklist command in the wrong file.

That's because the blacklisting should be done by editing the existing /etc/modeprobe.d/blacklist.conf. And not by creating a new file named blacklist.

Blacklist.conf by default already contains a list of blacklisted kernel modules. You can simply add the following lines for acer_wmi:

# switch the wireless chipset on
blacklist acer_wmi

You can use the following command for editing:
gksudo gedit /etc/modprobe.d/blacklist.conf