I started off with suspend and switched to hibernate as it seemed to work 
little better. 
Anyway I have tried suspend using the info from the wiki. It looks like the 
machine suspends  correctly: it switches off the fans and in the end the screen 
too (although I have set the boot parameter 'no_console_suspend') and power-led 
starts blinking slowly. 
However when I wake the machine by presing any key on the keyboard, it turns on 
the fans but the screen remains off and it seems too hang. I have tried to type 
'reboot' in the blind (should be possible as I was logged in as root before 
suspend)  but the machine does not react. The only way to get out is to hold 
the powerbutton 5 seconds.

For hibernate, this will hang up the machine (black screen, fans on, no 
reaction on keyboard):
echo devices > /sys/power/pm_test
echo platform > /sys/power/disk
echo disk > /sys/power/state

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https://bugs.launchpad.net/bugs/797922

Title:
  kernel hangs in pm-hibernate on saving to disk

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