kernel lockup on resume

[Leann Ogasawara]

On Sat, 2010-01-02 at 20:12 +0100, John Zoidberg wrote:
> Hi,
> 
> Suspend to RAM has never worked on my laptop (suspend to disk works)
> and I would really like to help fix this issue.
> 
> When I try to resume, I always get a black screen and the kernel seems
> to be locked up: caps-lock key has no effect, ctrl+alt+del and sysrq
> keys not working.
> I have to keep the power button pressed to shut down the machine.
> 
> According to this page: http://en.opensuse.org/S2ram
> 
> "If none of the methods described here seem to work, it is important
> to check if the machine is completely dead on resume or only the video
> is not resumed properly. A good way to check this is to start with a
> minimal system (init=/bin/bash), run s2ram -f, and after resume, when
> the display is still off, check if the "Caps Lock" key still works
> (you should see a reaction of the Caps Lock LED on the keyboard). If
> it does, it is most likely really a video initialization problem. If
> it doesn't, then it is most likely a BIOS problem or a bug in the
> Linux kernel."
> 
> I did this and since the caps lock key is not working, I'm assuming
> it's a BIOS or kernel problem. (I did try the different s2ram options
> too a while ago, but nothing worked).
> 
> I then tried to use pm_trace as described here:
> https://wiki.ubuntu.com/DebuggingKernelSuspend
> 
> I attached the resulting dmesg.txt to this e-mail.
> 
> Here is some more system info:
> ======================
> [30][~]$  lsb_release -a
> No LSB modules are available.
> Distributor ID:	Ubuntu
> Description:	Ubuntu 9.10
> Release:	9.10
> Codename:	karmic
> [31][~]$  uname -a
> Linux my-laptop 2.6.31-16-generic #53-Ubuntu SMP Tue Dec 8 04:01:29
> UTC 2009 i686 GNU/Linux
> [32][~]$  sudo s2ram -n
> Machine unknown
> This machine can be identified by:
>     sys_vendor   = "Hewlett-Packard        "
>     sys_product  = "Presario 2500 (DF855A)   "
>     sys_version  = "KH.F.08                  "
>     bios_version = "KF_KH.F.08"
> See http://suspend.sf.net/s2ram-support.html for details.
> 
> If you report a problem, please include the complete output above.
> 
> ======================
> 
> I also attached the output of "sudo lspci -vvvxxx".
> 
> I'm willing to recompile the kernel if necessary, but I'm not sure
> where to begin.
> Could somebody please guide me in debugging this issue?
> 
> Of course any direct solution to the resume problem is also appreciated. :)

Hi John,

Can you file a bug in launchpad with the information you've provided
here.  It will be easier for us to then track the issue.  I'd suggest
using the following command to file the bug in Launchpad:

ubuntu-bug linux

Thanks,
Leann