[ubuntu-za] Random Freezes

[David Nel]

Yeah I was refering to the magic keys but that didn't seem to have any
affect either. I even tried using ctrl with the alt button as I read
somewhere that gnome tends to just spit out screengrabs without using the
ctrl button as well. Didn't work though. I also made sure to hold each key
for 2-5 seconds, still no response.



On 21 December 2010 16:41, Trevor Hughes <linux at thewildfig.co.za> wrote:

> On Tue, Dec 21, 2010 at 3:53 PM, David Nel <david.uberdiablo at gmail.com>
> wrote:
> > My system would also go in to a dead freeze where I could not access any
> > shortcut commands to gain access to the console or even force a reboot.
> I've
> > now installed the latest kernel within the maverick release and will have
> to
> > see how it goes. Hopefully it doesn't give anymore freezes.
>
> Are you talking about the magic keys Alt-SysReq R-E-I-S-U-B
>
> SysReq is the same key as PrtScn!
>
> B boots and the others reset and sync and do other nice stuff
>
> Quite often those keys will work even when your system seems frozen
> solid. If it responds to these keys it was not completely dead!
>
> from wikipedia
>
> unRaw      (take control of keyboard back from X),
>  tErminate (send SIGTERM to all processes, allowing them to terminate
> gracefully),
>  kIll      (send SIGKILL to all processes, forcing them to terminate
> immediately),
>  Sync     (flush data to disk),
>  Unmount  (remount all filesystems read-only),
> reBoot.
>
> This can prevent a fsck being required on reboot and gives some
> programs a chance to save emergency backups of unsaved work.
>
> In practice, each command may require a few seconds to complete,
> especially if feedback is unavailable from the screen due to a freeze
> or display corruption. For example, sending SIGKILL to processes which
> have not yet finished terminating can cause data loss.
>
> Trev
>
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