"System halted" but system will not powerdown

[elParaguayo]

Binary package hint: apport

When shutting down the screen says "System will now halt" and then it sounds like the drives power down, however the display remains on as does the CPU fan.
If I remove the "quiet" option from the boot menu it then says "system halted" but with the same end result.

This is a new build PC.
Mobo: GA-870A-UD3
OS: Mythbuntu 10.10 (kernel 2.6.35-25)
GPU: Nvidia 210

ProblemType: Bug
DistroRelease: Ubuntu 10.10
Package: apport 1.14.1-0ubuntu8.1
ProcVersionSignature: Ubuntu 2.6.35-25.44-generic-pae 2.6.35.10
Uname: Linux 2.6.35-25-generic-pae i686
NonfreeKernelModules: nvidia
Architecture: i386
Date: Sat Feb 19 09:32:50 2011
InstallationMedia: Mythbuntu 10.10 "Maverick Meerkat" - Release i386 (20101007)
PackageArchitecture: all
ProcEnviron:
 LANG=en_GB.utf8
 SHELL=/bin/bash
SourcePackage: apport

[Philip Muškovac (yofel)]

Thanks for taking your time to report this bug. This isn't a bug in apport though so I'm reassigning it.

[elParaguayo (elparaguayo)]

Thanks Philip.

FYI - the system reboots fine, it's just the powerdown that's not working. I haven't yet tested the suspend/hibernate options.

Also, I don't know if this is relevant, but I have the "too many connections" message when the system boots. There's a thread about this on the forums (http://ubuntuforums.org/showthread.php?t=1635278) as well as a bug tracker (https://bugs.launchpad.net/ubuntu/+source/linux/+bug/595448)

[elParaguayo (elparaguayo)]

A quick update.

It looks like this is to do with an irq conflict.

I can get the machine to powerdown in two scenarios:
1) disabling one core of my Athlon X2 245e
2) removing the TV tuner card

[Philip Muškovac (yofel)]

Assigning to the kernel then.

[Brad Figg (brad-figg)]

This bug is missing log files that will aid in diagnosing the problem. From a terminal window please run:

apport-collect 721706

and then change the status of the bug to 'Confirmed'.

If, due to the nature of the issue you have encountered, you are unable to run this command, please add a comment stating that fact and change the bug status to 'Confirmed'.

This change has been made by an automated script, maintained by the Ubuntu Kernel Team.

[Launchpad Janitor (janitor)]

[Expired for linux (Ubuntu) because there has been no activity for 60 days.]

[Engineeringtech (jim00c)]

I have the same problem with my machine. XP and Ubuntu 10.10 dual boot, controlled by Grub2. I can shutdown from XP, but can't from Ubuntu. Sure I can always mash the power button, but why can Windows do it when Ubuntu can't? I have tried most of the things suggested here, like disabling the wireless, etc. . Gigabyte GA-EP45-UD3P motherboard.