What does dmesg say for you?
Is it similar to the one from Sean 
(https://bugs.edge.launchpad.net/ubuntu/+source/acpi-support/+bug/15372/comments/7)
 - I'm adding it also to the bug description, so it can get found easier.

** Description changed:

  With a default install of ubuntu hoary after turning on acpi suspend support
  resuming from S3 causes huge problems. After the machine resumes (the 
suspending
  seems to go fine) there is a huge amount of hard drive activity, many
  application refuse to start (such as top and ls) and the machine tends to 
freeze
  completely if I try to open the applications menu. Changing any of the options
  in /etc/default/acpi-support has no effect and neither does bypassing the
  scripts in /etc/acpi by echoing mem to /sys/acpi/state manually. I've also 
tried
  turning off laptop-mode. I've just come
  from debian unstable to ubuntu and the debian kernels 2.6.9, 2.6.10 and 2.6.11
  did not have this problem. I'm going to try a vanilla kernel from kernel.org 
to
  see if that has any effect. I managed to get top running after resuming by
  starting before I suspended but it didn't really show anything unusual though 
dd
  was running and i'm not sure why. My id in the hardware database is:
  45d24e53319bdba4f4ae97805a39a254
+ 
+ 
+ From comment below (in Ubuntu Dapper):
+ I've tested suspend on dapper today. Now X starts and i get back to my 
desktop but the hard drive still goes crazy. I've tested suspending on a 
console to see what dmesg had to say after i tried to use ls. The following 
message is shown 4 times:
+ 
+ hda: dma_intr: status=0x51 { DriveReady SeekComplete Error }
+ hda: dma_intr: error=0x10 { SectorIdNotFound }, LBAsect=7292699, 
sector=72926983
+ ide: failed opcode was: unknown
+ 
+ then the following is shown:
+ 
+ hda: DMA disabled
+ ide0: reset: success
+ 
+ then the following is repeated endlessly:
+ 
+ hda: task_out_intr: status=0x51 { DriveReady SeekComplete Error }
+ hda: task_out_intr: error=0x10 { SectorIdNotFound }, LBAsect=7292699, 
sector=72926983
+ ide: failed opcode was: unknown

** Also affects: linux (Ubuntu)
   Importance: Undecided
       Status: New

-- 
Huge hard drive activity after resuming from S3 suspend on a IBM x31
https://bugs.launchpad.net/bugs/15372
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