Following two steps fixed my problem:
.....
First: update your /etc/X11/xorg.conf and add an "Option "NvAGP" "1" line in
the "Section "Device" (note that this is necessary even for PCI-Express
graphics cards for resume to work reliably):
Section "Device"
...
Option "NvAGP" "1"
EndSection
Second: blacklist the intel_agp module from being loaded by the kernel.
This is done by editing /etc/modprobe.d/blacklist and adding the
following line:
blacklist intel_agp
......
Compaq Presario 3000 model: R3470us
Ubuntu 9.04
--
black screen on resume from suspend with Opteron 64 and GeForce Go hardware
https://bugs.launchpad.net/bugs/229806
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