Having thought about this for a bit, and having come up with a (just about) plausible explanation for the problem, I've reenabled hard drive power management in the AC mode change script.
The problem was hangs associated with switching from AC to battery, or vice-versa. I /think/ the cause for this may have been down to the laptop hardware sending IDE commands on power change (such as to slow down CD drive speed), and sending the APM command at the same time may have then hung the IDE bus. To get around this, I've delayed the sending of commands until a while after the state change. It's possible that this isn't the problem, and if so it's likely that it'll suddenly reappear and start biting people. So, it would be helpful if you could let me know if changing your power source suddenly results in the machine hanging (either at the time of the event, or the next time it tries any disk access). Thanks, -- Matthew Garrett | [EMAIL PROTECTED] -- laptop-testing-team mailing list [email protected] https://lists.ubuntu.com/mailman/listinfo/laptop-testing-team
