Lockup on AC cable unplugged

Bug #198144 reported by Nicolay Doytchev on 2008-03-03
Affects Status Importance Assigned to Milestone
gnome-power-manager (Ubuntu)

Bug Description

Binary package hint: gnome-power-manager

DISTRIB_DESCRIPTION="Ubuntu hardy (development branch)"




My laptop computer (Clevo D400S / Intel P4 1.8GHz / SiS 650 Chipset) has strange behaviour in Ubuntu 7.10 and 8.04 when suspending. I have experienced lockups on some resumes usually 1 of 3 and narrowed the behaviour by extensive testing and here is how I can reproduce it:

1. I startup the book on battery;
2. I suspend after loaded to desktop;
3. Then when suspended I plug in the AC;
4. I resume it;
4.5. With 2.6.22 there was a very fast libnotify popup on g-p-m which I succeeded to screen / see attachment /
5. Everything goes fine;
6. And here if I unplug the AC my book locksup;

There is no output in /var/log/syslog or kernlog, and the suspend log goes normal.

I have tested this with the stock 7.10 kernel, as well as with Debian's 2.6.24 kernel and same story repeats.

What I discovered is that if I kill gnome-power-manager after step 5 and before step 6 - there is no lockup and
system continues to function properly. If I restart it after killing it - everything continues to work properly. I decided that I will try to upgrade to 8.04 and see if this has been fixed - and indeed there was no such problem with 2.6.24 , but gnome-power-manager didn't measure battery at all only #acpi did. Then I started 8.04 with the 2.6.22 kernel and gnome-power-manager measured everything fine but the initial problem reappeared.

Now I am not totally sure that the bug is in gnome-power-manager or in the connection between that and the acpi system or in the kernel itself. But it looks like the rest of the system works fine if gnome-power-manager doesnt interfere too much with it (8.04 + 2.6.24). I hope it is an isolated problemon my machine - I will just execute a script to kill and restart g-p-m on resume but if it is a bug it needs to be fixed imo.

04 Mar | Update:

After yesterday's updates (2.6.24-10 to 11):
1. g-p-m detects battery life correctly.
2. lockups are back as well the fast popup is missing.

description: updated
Nicolay Doytchev (lightrush) wrote :
description: updated
Pedro Villavicencio (pedro) wrote :

Thank you for taking the time to report this bug and helping to make Ubuntu better. You reported this bug a while ago and there hasn't been any activity in it recently. We were wondering is this still an issue for you? Thanks in advance.

Changed in gnome-power-manager:
importance: Undecided → Low
status: New → Incomplete
Nicolay Doytchev (lightrush) wrote :

Well, I dont use this laptop anymore, and I havent trued the latest Hardy on it. Considering it is a fairly rare chipset being used nowadays as well a very rare laptop - I dont think this should be considered important anymore. What do you think?

Pedro Villavicencio (pedro) wrote :

well since there's no duplicates, i'll close this bug , feel free to re open it if you experience the same again. thanks.

Changed in gnome-power-manager:
status: Incomplete → Invalid
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