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

1. I'm now using kernel 2.26.7.11-generic kernel, as provided in the
default repositories (and following recommended upgrade on Intrepid).

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

3. I'm not sure if it's necessary, but I did a BIOS upgrade, as 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,

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HP Pavilion dv5: ATA exception on resume from suspend
https://bugs.launchpad.net/bugs/301353
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