Comment 49 for bug 443318

Not sure what's the correct procedure, but here's what I did to supply the requested acpidump:

1) enable acer_wmi (because I have it blacklisted)
sudo modprobe acer_wmi

2) held down key "t", periodic hickups (freezes) happened

3) sudo acpidump > /tmp/acpidump.out

4) uname -a
Linux as5520g 2.6.31-21-generic #59-Ubuntu SMP Wed Mar 24 07:28:27 UTC 2010 x86_64 GNU/Linux

5) lsb_release -a
No LSB modules are available.
Distributor ID: Ubuntu
Description: Ubuntu 9.10
Release: 9.10
Codename: karmic

6) I've got an Acer Aspire 5520G