Ok, so I took some time debugging the issue, I followed the guidelines
on the wiki (https://wiki.ubuntu.com/DebuggingKernelSuspend)

As I'm on a fresh install, the issue only triggered once or twice in a
series of 5-6 suspends. I suspended with "sudo sh -c "sync; echo 1 >
/sys/power/pm_trace; pm-suspend" creating a trace in dmesg.

I added the dmesg output as an attachment, and you can see two call
stacks from fglrx. The last suspend in the trace took about 2 minutes to
resume, that would be the most interesting one. Though, it could be that
this is a different issue than Joep Jansen (comment #9).

Thanks

** Attachment added: "dmesg output"
   
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/658307/+attachment/1803800/+files/dmesg23jan1100.txt

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Title:
  Slow resume from suspend on Dell Inspiron M301Z

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