Sorry for a very late update. Today I faced the same issue again. Here
is the output of 'free':
$ free
total used free shared buffers cached
Mem: 1034380 502044 532336 0 2476 144716
-/+ buffers/cache: 354852 679528
Swap: 2097136 48340 2048796
I could see the following lines in my syslog:
Mar 10 08:28:06 localhost kernel: [22793.956000] swsusp: critical section:
Mar 10 08:28:06 localhost kernel: [22793.956000] swsusp: Need to copy 130764
pages
Mar 10 08:28:06 localhost kernel: [22793.956000] swsusp: Normal pages needed:
114560 + 1024 + 24, available pages: 114870
Mar 10 08:28:06 localhost kernel: [22793.956000] swsusp: Not enough free memory
Mar 10 08:28:06 localhost kernel: [22793.956000] Error -12 suspending
--
computer doesn't hibernate
https://bugs.launchpad.net/bugs/165328
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