I've done some testing with pm-suspend and its flags. pm-suspend outputs
nothing during suspend in any case. However I've found that there is an
option which makes resume work. The flags and associated behaviours are:

- Without any flags, the computer suspends. When it comes back from
resume, the disks spin up, USB becomes active and nothing else happens.
Keyboard is usually responsive (I can toggle NumLock and use SysRq to
reboot). If I try to switch to the graphical environment with
Ctrl+Shift+F7, the machine hangs (keyboard not responsive anymore).

- With --quirk-s3-bios, the machine hangs before activating USB.

- With --quirk-vbestate-restore, resume does work. The screen doesn't
turn itself on unless I hit Ctrl-Shift-F7.

- With --quirk-vbestate-restore --quirk-dpms-on, resume works and the
screen turns itself on.

- The behaviour when using other flags is like that when using none.

I suspect the driver for my ATI xpress 200 card. Until Intrepid, I used
the fglrx driver because the free one wouldn't work. Now it does, and
does a great job most of the time, but there are sporadic X crashes (see
bug #336320) and I wouldn't be surprised if the driver was behind the
suspend problem.

Let me know if I can produce any additional information to further
diagnose this.

-- 
[Hewlett-Packard HP Compaq dc5750 Microtower] suspend/resume failure
https://bugs.launchpad.net/bugs/336680
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