shutdown restarts laptop (and disables kb)

[Firesam]

On Thu, 2011-07-21 at 09:07 +0530, d~_*b wrote:
> On 21 July 2011 08:21, Firesam <ubuntu at e17th.com> wrote:
> >
> > I am having a very strange (to me at least) problem with my laptop
> > computer. It took a while until I was able to replicate the exact
> > circumstances that caused it. Whenever I shutdown the laptop restarts
> > and does not power off. Just incase that is not annoying enough when it
> > restarts the internal kb and mouse are disabled. Interstingly enough mot
> > only that this is not caused by choosing restart (the kb/mouse thing)
> > but restart fixes it and re-enables the kb and mouse.
> >
> > I don't know if this is related but in grub choosing a command line and
> > typing halt just freezes and does not power off. reboot does reboot.
> >
> > I can supply (I think) any files/logs etc.. that will help.
> >
> > Thanks.
> >
> 
> Just to make sure if all is proper, the next time you want to shut
> down, try this command and see if this works OK.
> 
> sudo shutdown -P now # This will power off the sys immediately
> 
> BTW could you give details of the Desk Env you are using ?
> 
> --
> & Ru Chelladurai
> 

shutdown -P also does not power off. The computer still restarts. I am
using gnome desktop and uname -a outputs
        Linux xxx 2.6.38-10-generic #46-Ubuntu SMP Tue Jun 28 15:07:17
        UTC 2011 x86_64 x86_64 x86_64 GNU/Linux
        
I am not sure anymore about the mouse and keyboard bec they did not get
disabled. I tried using the shutdown menu in gnome also and this time it
did not cause the mouse and kb to not work. I don't know the exact
circumstances but sometime my internal kb and mouse stop working. How
can I track down the cause of this? Can it be related to the power off
problem?