Re: Using netconsole for debugging suspend/resume

[Auke Kok <auke-jan.h.kok@intel.com>]

Jeremy Fitzhardinge wrote:
> I've been trying to get suspend/resume working well on my new laptop.  
> In general, netconsole has been pretty useful for extracting oopses and 
> other messages, but it is of more limited help in debugging the actual 
> suspend/resume cycle.  The problem looks like the e1000 driver won't 
> suspend while netconsole is using it, so I have to rmmod/modprobe 
> netconsole around the actual suspend/resume.
> 
> This is a big problem during resume because the screen is also blank, so 
> I get no useful clue as to what went wrong when things go wrong.  I'm 
> wondering if there's some way to keep netconsole alive to the last 
> possible moment during suspend, and re-woken as soon as possible during 
> resume.  It would be nice to have a clean solution, but I'm willing to 
> use a bletcherous hack if that's what it takes.
> 
> Any ideas?

Have you tried using different cards/drivers? This might or might not be 
either a netconsole problem (generic) or driver related (which could impact 
other drivers too).

 From the top of my head I don't see any reason why the e1000 shouldn't handle 
the suspend event - but mind you that a fix for e1000/WoL impacting shutdown 
handlers was only recently added. Which kernels does this impact?

Auke