Re: Understanding the hibernation sequence

[Celejar <celejar@gmail.com>]

On Thu, 9 Feb 2012 16:28:55 +0000 (UTC)
Camaleón <noelamac@gmail.com> wrote:

> On Tue, 07 Feb 2012 16:08:18 -0500, Celejar wrote:
> 
> > I'm trying to debug / figure out why resuming from hibernation often
> > results in a kernel panic on my machine. One thing I don't understand,
> > although I don't know whether it is in any way related to the problem,
> > is why the hibernate script seems to only sometimes actually do what its
> > supposed to do
> > 
> > E.g., sometimes I get this, which looks right:
> 
> (...)
> 
> > hibernate: [91] Executing ModulesUnloadBlacklist ... 
> > Unloading blacklisted modules listed /etc/hibernate/blacklisted-modules 
> > Module version for ipw2100 is
> > Module version for ipw2200 is
> > Unloading blacklisted module psmouse (and dependencies) Unloading psmouse ...
> > Removing modules with rmmod.
> > Unloading blacklisted module ehci_hcd (and dependencies) Unloading ehci_hcd ...
> > Unloading blacklisted module uhci_hcd (and dependencies) Unloading uhci_hcd ...
> > Module version for snd_bt_sco is
> > Module version for ndiswrapper is
> > Unloading blacklisted module mac80211 (and dependencies) Unloading iwl4965 ...
> > Unloading iwl_legacy ...
> > Unloading mac80211 ...
> 
> (...)
> 
> > But sometimes I just get the 'hibernate' lines, but no action seems to
> > actually occur:
> 
> (...)
> 
> > hibernate: [91] Executing ModulesUnloadBlacklist
> > ... hibernate: 
> 
> (...)
> 
> > Does this mean that for some reason, the bad modules are not getting
> > unloaded (among other things)? If so, I suppose that this could be
> > causing my problems - but why is this happening? I can find no rhyme or
> > reason for when things happen and when they don't.
> 
> There are some tips for debugging hibernation/resuming at 
> "/usr/share/doc/pm-utils/README.debugging". Personally, I would start by 
> increasing the verbosity of the logs (PM_DEBUG="true").

Thanks - I actually started playing with that (with the hibernate
command's '-v n' option), but I got distracted. 

> Sorry for not being more detailed or concise but hibernation/suspend/thawing 
> look to me like wizardry words pertaining to an unexplored magical realm :-)

Thanks for the help!

> Greetings,

Celejar