Comment 42 for bug 424877

This has actually started to affect me again. It doesn't sleep anymore, and I get this in the suspend log :

Wed Jan 6 20:37:50 GMT 2010: Running hooks for suspend.
/usr/lib/pm-utils/sleep.d/000record suspend suspend: success.
/usr/lib/pm-utils/sleep.d/00auto-quirk suspend suspend: Adding quirks from HAL: --quirk-none
success.
/usr/lib/pm-utils/sleep.d/00logging suspend suspend: Linux Defiant 2.6.31-16-generic #53-Ubuntu SMP Tue Dec 8 04:01:29 UTC 2009 i686 GNU/Linux
Module Size Used by

<Module list removed for space>

             total used free shared buffers cached
Mem: 949224 477420 471804 0 56100 235696
-/+ buffers/cache: 185624 763600
Swap: 385520 0 385520
success.
/usr/lib/pm-utils/sleep.d/00powersave suspend suspend: success.
/usr/lib/pm-utils/sleep.d/01PulseAudio suspend suspend: success.
/etc/pm/sleep.d/10_grub-common suspend suspend: success.
/etc/pm/sleep.d/10_unattended-upgrades-hibernate suspend suspend: success.
/etc/pm/sleep.d/11_mmc_mounts suspend suspend: umount2: Device or resource busy
umount: /home: device is busy.
        (In some cases useful info about processes that use
         the device is found by lsof(8) or fuser(1))
umount2: Device or resource busy
Returned exit code 1.
Wed Jan 6 20:37:50 GMT 2010: Inhibit found, will not perform suspend
Wed Jan 6 20:37:50 GMT 2010: Running hooks for resume
/etc/pm/sleep.d/10_unattended-upgrades-hibernate resume suspend: success.
/etc/pm/sleep.d/10_grub-common resume suspend: success.
/usr/lib/pm-utils/sleep.d/01PulseAudio resume suspend: success.
/usr/lib/pm-utils/sleep.d/00powersave resume suspend: success.
/usr/lib/pm-utils/sleep.d/00logging resume suspend: success.
/usr/lib/pm-utils/sleep.d/00auto-quirk resume suspend: success.
/usr/lib/pm-utils/sleep.d/000record resume suspend: success.

I added the -f switch to umount in the script, but to no avail.