i am having the same problem on gutsy, trying for weeks, now it finally
works somehow (network still does not resume)

i think what made the difference is commenting this:
file: /usr/share/acpi-support/screenblank
#               if [ x$LOCK_SCREEN = xtrue ]; then      
#               su $user -c "(xscreensaver-command -lock)"
#       fi

and  /etc/default/acpi-support
#SAVE_VBE_STATE=true
# The file that we use to save the vbestate
#VBESTATE=/var/lib/acpi-support/vbestate

you may also try to disable compiz
good luck!

-- 
Resume from suspend leads to blank screen with i810 driver on Samsung X20 
(Intel GM915 Chipset)
https://bugs.launchpad.net/bugs/153329
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