As I also own a Z61m but use Gentoo on it... I just tried an upgrade to
2.6.22, and I noticed just like [1] that the new SLUB allocator breaks
fglrx. Reverting to SLAB fixes the problem for me and I can
suspend/resume just fine.

Ubuntu sets CONFIG_SLUB=y in its generic 2.6.22 kernel. If this would be
reverted to CONFIG_SLAB=y (instead of using still "experimental" code,
although the problem probably lies in fglrx) suspend/resume should work
again.

[1] http://lkml.org/lkml/2007/6/17/96

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[gutsy] Suspend to Ram does not work on Z61m
https://bugs.launchpad.net/bugs/121653
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