I am unable to reproduce the symptoms, although they have occurred a few
times: perhaps one out of 10 resumes. I'm not exactly sure what to look
for, but kern.log said this: (seemed appropriate to "cut")

Mar 25 13:36:08 AmesMacBook kernel: [ 3395.290644] ------------[ cut here 
]------------
Mar 25 13:36:08 AmesMacBook kernel: [ 3395.290648] WARNING: at 
/build/buildd/linux-2.6.28/kernel/power/main.c:177 
suspend_test_finish+0x80/0x90()
Mar 25 13:36:08 AmesMacBook kernel: [ 3395.290652] Component: resume devices
Mar 25 13:36:08 AmesMacBook kernel: [ 3395.290654] Modules linked in: i915 drm 
binfmt_misc ppdev lp parport bridge stp bnep vboxnetflt vboxdrv uvcvideo 
compat_ioctl32 videodev v4l1_compat snd_hda_intel snd_pcm_oss snd_mixer_oss 
snd_pcm arc4 ecb snd_seq_dummy snd_seq_oss snd_seq_midi snd_rawmidi ath5k 
snd_seq_midi_event snd_seq snd_timer snd_seq_device joydev mac80211 applesmc 
iTCO_wdt iTCO_vendor_support snd led_class video soundcore cfg80211 appletouch 
isight_firmware pcspkr input_polldev intel_agp agpgart tpm_infineon tpm 
tpm_bios output snd_page_alloc hid_apple usbhid ohci1394 ieee1394 sky2 vesafb 
fbcon tileblit font bitblit softcursor
Mar 25 13:36:08 AmesMacBook kernel: [ 3395.290722] Pid: 6482, comm: pm-suspend 
Not tainted 2.6.28-11-generic #37-Ubuntu
Mar 25 13:36:08 AmesMacBook kernel: [ 3395.290726] Call Trace:
Mar 25 13:36:08 AmesMacBook kernel: [ 3395.290734]  [<c0139a60>] 
warn_slowpath+0x60/0x80
Mar 25 13:36:08 AmesMacBook kernel: [ 3395.290740]  [<c015378a>] ? 
down_trylock+0x2a/0x40
Mar 25 13:36:08 AmesMacBook kernel: [ 3395.290747]  [<c013a0bd>] ? 
try_acquire_console_sem+0xd/0x30
Mar 25 13:36:08 AmesMacBook kernel: [ 3395.290754]  [<c02c7060>] ? 
kobject_put+0x20/0x50
Mar 25 13:36:08 AmesMacBook kernel: [ 3395.290760]  [<c0500ae1>] ? 
printk+0x18/0x1f
Mar 25 13:36:08 AmesMacBook kernel: [ 3395.290766]  [<c0164f00>] 
suspend_test_finish+0x80/0x90
Mar 25 13:36:08 AmesMacBook kernel: [ 3395.290772]  [<c0164fd6>] 
suspend_devices_and_enter+0xc6/0x160
Mar 25 13:36:08 AmesMacBook kernel: [ 3395.290776]  [<c0500ae1>] ? 
printk+0x18/0x1f
Mar 25 13:36:08 AmesMacBook kernel: [ 3395.290782]  [<c0165259>] 
enter_state+0xc9/0x100
Mar 25 13:36:08 AmesMacBook kernel: [ 3395.290787]  [<c016530d>] 
state_store+0x7d/0xc0
Mar 25 13:36:08 AmesMacBook kernel: [ 3395.290792]  [<c0165290>] ? 
state_store+0x0/0xc0
Mar 25 13:36:08 AmesMacBook kernel: [ 3395.290797]  [<c02c6f24>] 
kobj_attr_store+0x24/0x30
Mar 25 13:36:08 AmesMacBook kernel: [ 3395.290803]  [<c020a962>] 
sysfs_write_file+0x92/0xf0
Mar 25 13:36:08 AmesMacBook kernel: [ 3395.290810]  [<c01bd998>] 
vfs_write+0x98/0x110
Mar 25 13:36:08 AmesMacBook kernel: [ 3395.290815]  [<c020a8d0>] ? 
sysfs_write_file+0x0/0xf0
Mar 25 13:36:08 AmesMacBook kernel: [ 3395.290820]  [<c01bdacd>] 
sys_write+0x3d/0x70
Mar 25 13:36:08 AmesMacBook kernel: [ 3395.290826]  [<c0103f6b>] 
sysenter_do_call+0x12/0x2f
Mar 25 13:36:08 AmesMacBook kernel: [ 3395.290830] ---[ end trace 
f76e98f35461a6e5 ]---

I'm not sure if that's of any pertinence, it seems to do that every time it 
resumes.
The log is also filled with this, and it spews into the virtual terminals:
Mar 27 08:45:16 AmesMacBook kernel: [ 2553.576219] hub 1-0:1.0: unable to 
enumerate USB device on port 7
(sometimes it's port 1)

If it happens again I'll try to ssh or ping.

-- 
[Apple Computer, Inc. MacBook1,1] suspend/resume failure
https://bugs.launchpad.net/bugs/348516
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