I spoke too soon - it started happening again with ohci1394 unloaded.
Thus, I'm still completely baffled as to what introduced the issue...

** Summary changed:

- New in 2.6.22-13: ohci1394 causes system to take a LONG time to resume from 
suspend
+ New in 2.6.22-13: system takes a LONG time to resume from suspend

** Description changed:

  Binary package hint: linux-image-2.6.22-13-generic
  
  On my MacBook Core Duo (first generation, 32-bit), in the newest Ubuntu
  kernel I have no video after resuming from suspend-to-RAM on my MacBook
  for a *long* time (like 5-10 minutes) about 1 out of every 4 or 5
  suspend/resume cycles.  This only started after the recent update to the
  kernel - things worked fine in Gutsy up until that time.  This occurs
  whether I use X.org's "intel" or "i810" video drivers and seemed to
  begin happening around the time of the kernel update - hence my belief
  that it is somehow kernel-related.
  
- NOTE: I have since traced this issue to the "ohci1394" module -
- evidently an update between -12 and -13 makes it not play nice with
- suspend.
- 
  I have attached the following logs from /var/log - 
  dmesg
  acpid
  kern.log
  user.log
  
  Please note that the "suspend failed" in the user.log is erroneous - in
  that case, suspend actually succeeded but gnome-power-manager is known
  to be erroneously reporting failure (bug 137738 - there is a patch in
  that bug but it hasn't been applied).

-- 
New in 2.6.22-13: system takes a LONG time to resume from suspend
https://bugs.launchpad.net/bugs/151016
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