[ltp] cron vs. suspend (was: suspend resume works fine for sh ort suspends - fails for longer suspends)

[Tino Keitel]

On Tue, Apr 06, 2004 at 06:49:20 -0500, Ivarsson, Torbjorn (T) wrote:
> > -----Original Message-----
> > From: Ivarsson, Torbjorn (T) 
> > Sent: Friday, April 02, 2004 8:35 AM
> > 
> > > From: Bradley W. Langhorst [mailto:brad@langhorst.com]
> > > 
> > > I have a T40 running debian testing  APM, kernel 2.6.4
> > > 
> > > suspend/resume works fine if i test it out 20 times quickly 
> > > (up to about 30 minutes delay between suspend and resume)
> > > but if i leave the machine suspended overnight it invariably
> > > fails to resume
> >  
> > I have a R40 running Mandrake with APM, kernel 2.6.3. Gnome 
> > suspends and resumes without any problems (even overnight). 
> 
> I may have spoken too soon. I left my R40 suspended for a couple of
> days, suspended from the GUI log-in screen (i.e., no KDE, no Gnome),
> and I couldn't wake it up - though the backlit was on. Checking the
> log files after the next boot told me that cron is waking up the
> computer and runs a (standard) job at 01:00am every day and then
> suspends the computer.
> 
> It seems like this cron-wakeup may be partly responsible for the
> hang-up. I was under the impression that a suspend-to-RAM (APM) will
> stop most of the activities in the computer, but I guess I had the
> wrong impression...

No, you are right. Per definition, during suspend to RAM, the machine
is nearly switched off compelely. At least the operating system doesn't
run anymore. Only the RAM has power so it doesn't lose its content. On
my A30, the little moon light will light up during suspend to RAM.

Regards,
Tino