I have the same issue on my Dell Dimension 3000 but hibernate is effected as
well:
https://bugs.edge.launchpad.net/ubuntu/+source/linux-source-2.6.22/+bug/146690
<-- full dmesg and lspci and other info regarding this bug
** Also affects: linux-ubuntu-modules-2.6.22 (Ubuntu)
Importance: Undecided
Status: New
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Suspend not working on Inspiron 6400 (gutsy)
https://bugs.launchpad.net/bugs/140766
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