Ubuntu 12.04 hangs on shutdown

[Neil C Smith]

Extra information requested as per #991977

ProblemType: Bug
DistroRelease: Ubuntu 12.04
Package: linux-image-3.2.0-23-lowlatency 3.2.0-23.31
ProcVersionSignature: Ubuntu 3.2.0-23.31-lowlatency 3.2.14
Uname: Linux 3.2.0-23-lowlatency x86_64
NonfreeKernelModules: fglrx wl
ApportVersion: 2.0.1-0ubuntu7
Architecture: amd64
Date: Tue May 22 11:41:45 2012
InstallationMedia: Ubuntu 12.04 LTS "Precise Pangolin" - Release amd64 (20120425)
ProcEnviron:
 LANGUAGE=en_GB:en
 TERM=xterm
 PATH=(custom, user)
 LANG=en_GB.UTF-8
 SHELL=/bin/bash
SourcePackage: linux-lowlatency
UpgradeStatus: No upgrade log present (probably fresh install)

[Neil C Smith (neilcsmith-net)]

Extra info -

* System is a Dell Studio 1558 laptop.
* I'm using low-latency but get same behaviour with generic kernel.
* Only seems to happen when using fglrx. Open-source radeon driver hasn't triggered though has other issues for me.
* Seems far more likely to happen when on battery power than mains.
* Have switched off splash. When this bug happens there is a kernel oops and mention of DBus and flgrx. Will attempt to upload a photograph of the screen if/when it happens again.

[penalvch (penalvch)]

Neil C Smith, please be sure to confirm this issue exists with the latest development release of Ubuntu. ISO CD images are available from http://cdimage.ubuntu.com/daily/current/ . If the issue remains, please run the following command in the development release from a Terminal (Applications->Accessories->Terminal). It will automatically gather and attach updated debug information to this report.

apport-collect -p linux <replace-with-bug-number>

Also, if you could test the latest upstream kernel available that would be great. It will allow additional upstream developers to examine the issue. Refer to https://wiki.ubuntu.com/KernelMainlineBuilds . Once you've tested the upstream kernel, please remove the 'needs-upstream-testing' tag. This can be done by clicking on the yellow pencil icon next to the tag located at the bottom of the bug description and deleting the 'needs-upstream-testing' text.

If this bug is fixed in the mainline kernel, please add the following tag 'kernel-fixed-upstream'.

If the mainline kernel does not fix this bug, please add the tag: 'kernel-bug-exists-upstream'.

If you are unable to test the mainline kernel, for example it will not boot, please add the tag: 'kernel-unable-to-test-upstream'.

Please let us know your results. Thanks in advance.

[Neil C Smith (neilcsmith-net)]

Screenshot of kernel panic message when this happens.

As mentioned, I'm now using the low-latency kernel, and have threadirqs set. It may be coincidence, but this error now hardly ever happens on mains power. Reproducible consistently on battery though.

[Launchpad Janitor (janitor)]

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