Comment 22 for bug 544548

Confirming bug and workaround on non-VIA chipset. CD/DVD stops responding to inserted media some time after boot.

In this case, the workaround is:

sudo rmmod pata_amd
sudo modprobe pata_amd

> uname -r
2.6.32-25-generic
> lsb_release -a
No LSB modules are available.
Distributor ID: Ubuntu
Description: Ubuntu 10.04.1 LTS
Release: 10.04
Codename: lucid

Motherboard is ASUS P5N-E SLI

Attached file kern.log_excerpt shows two boots and later lost interrupt/disable events.