Re: How to debug resume (suspend) problems?

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On 08/28/2010 01:21:37 AM, Felix Schwarz wrote:
> Am 27.08.2010 22:09, schrieb Konstantin Svist:
> > Check if numlock+capslock are flashing -- if they are, kernel
> crashed
> >
> > Check if you can switch to a virtual terminal with Ctrl+Alt+F2..F6
> 
> No, I tried that before (sorry, did not mention that)
> 
> > edit /etc/sysctl.conf and set sysreq = 1. After that, when you get 
> a
> > freeze, try using REISUB (http://en.wikipedia.org/wiki/Reisub) to
> reboot
> 
> I enabled the magic sysrq and verified that I can use it when the
> system 
> is up and running. When provoked a resume failure, the system did not 
> react to any of the sysrq combinations.
> 
> So it looks to me like the system is just completely dead. Any ideas
> how 
> I can gather more information? Suspend/resume worked well in Fedora 
> 12
> 
> and in the beginnings of Fedora 13 so I really want to have that
> feature 
> back!

This is a good place to start.

http://www.mjmwired.net/kernel/Documentation/power/basic-pm-
debugging.txt

It also helps to know that /usr/sbin/pm-suspend (and related commands) 
are shell scripts, so they can be executed with 'sh -x' to follow 
what's happening.  Finally, that happens on each suspend (aka suspend 
to mem) and hibernate (aka suspend to disk) gets recorded in /var/log/
pm-suspend.log.

Good luck.

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