In those cases where hibernate hangs indefinitely, I get the following
entries in /var/log/messages:

Jan 19 23:47:36 w00t kernel: [15880.054108] ieee1394: sbp2: resp 0x1, 
sbp_status 0xff
Jan 19 23:47:37 w00t kernel: [15881.050417] ieee1394: sbp2: resp 0x1, 
sbp_status 0xff
Jan 19 23:47:37 w00t kernel: [15881.051365] ieee1394: sbp2: resp 0x1, 
sbp_status 0xff
Jan 19 23:47:37 w00t kernel: [15881.052244] ieee1394: sbp2: resp 0x1, 
sbp_status 0xff
Jan 19 23:47:37 w00t kernel: [15881.053181] ieee1394: sbp2: resp 0x1, 
sbp_status 0xff
Jan 19 23:47:37 w00t kernel: [15881.054071] ieee1394: sbp2: resp 0x1, 
sbp_status 0xff
Jan 19 23:47:49 w00t kernel: [15893.534572] ieee1394: sbp2: resp 0x1, 
sbp_status 0xff
Jan 19 23:47:49 w00t kernel: [15893.535283] ieee1394: sbp2: resp 0x1, 
sbp_status 0xff

These are the last messages and they appear in large quantities when I
try to hibernate my computer. Needless to say these messages do not
appear when the drobo is not plugged in through firewire and hibernate
succeeds. The first message following the stream of these messages is:

Jan 20 00:00:03 w00t kernel: imklog 4.2.0, log source = /var/run/rsyslog/kmsg 
started.
Jan 20 00:00:03 w00t rsyslogd: [origin software="rsyslogd" swVersion="4.2.0" 
x-pid="1177" x-info="http://www.rsyslog.com";] (re)start
Jan 20 00:00:03 w00t rsyslogd: rsyslogd's groupid changed to 103
Jan 20 00:00:03 w00t rsyslogd: rsyslogd's userid changed to 102
Jan 20 00:00:03 w00t kernel: [    0.000000] Initializing cgroup subsys cpuset
Jan 20 00:00:03 w00t kernel: [    0.000000] Initializing cgroup subsys cpu
Jan 20 00:00:03 w00t kernel: [    0.000000] Linux version 2.6.31-17-server 
(bui...@crested) (gcc version 4.4.1 (Ub


which appears to be start of the typical reboot sequence (after I forced it 
through holding down the power button).

I hope this helps pinning down the problem ...

-- 
hibernate hangs, when firewire disk is plugged in
https://bugs.launchpad.net/bugs/509302
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