I had the same problem at first with my HP Pavilion DV5-1124CA , using
Intrepid, but now, I can successfully suspend and resume.  Here's what I
did (3 steps):

1.  I'm now using kernel 2.26.7.11-generic kernel, as provided in the
default repositories (and following recommended upgrade on Intrepid);
With this kernel, I can suspend/resume, but then, keyboard/mouse are not
functional.  Other st


2.  I'm using the kernel boot option i8042.reset, that must be added to the 
Grub menu.lst file, in /boot/grub, as in the following:

title           Ubuntu 8.10, kernel 2.6.27-11-generic
root            (hd0,4)
kernel          /boot/vmlinuz-2.6.27-11-generic 
root=UUID=e805a537-55fa-4e4f-8f3d-866780911afc ro quiet splash i8042.reset
initrd          /boot/initrd.img-2.6.27-11-generic
quiet
savedefault


3.  Finally, I'm not sure if it's necessary, but I did a BIOS upgrade, that has 
been identified as a potential fix for another bug:  
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/301353

This BIOS upgrade is provided by HP (the link here is for my specific
model; other DV5 models could have a similar upgrade available):
http://h10025.www1.hp.com/ewfrf/wc/softwareList?os=2093&lc=en&dlc=en&cc=ca&lang=en&product=3828098

-- 
[HP Pavilion dv5 Notebook PC] suspend/resume problem [non-free: nvidia]
https://bugs.launchpad.net/bugs/332805
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