How to debug resume (suspend) problems?

Konstantin Svist fry.kun at
Fri Aug 27 20:09:57 UTC 2010

  On 08/27/2010 12:54 PM, Felix Schwarz wrote:
> Hi,
> I'm using F13 x86_64 on a Dell Vostro 1500 laptop and with the last
> kernels in F13, I have the problem that my laptop does not properly
> resume from sleep. Most of the time, I just see the "blue screen" with
> the fedora logo but nothing happens afterwards...
> This happens not always but most of the time (~ 80%). No lines in the
> system, the system is just "dead". Kernel is not tainted...
> How can I debug that? I think before opening a bz report, I first need
> to gather some data but how?
> fs

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

edit /etc/sysctl.conf and set sysreq = 1. After that, when you get a 
freeze, try using REISUB ( to reboot


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