Comment # 24 on bug 935086 from Takashi Iwai

Hm, then uswsuspend might be also broken with the recent kernel.  This method
isn't used by many distros, so little tested, I'm afraid.

As of now, the current solution seems to go to the direction to change the
default sleep method.  Many things have been discussed in bug 925873.  So,
further debugging of /usr/sbin/resume might not help much...

Maybe it's better to concentrate on stabilization of kernel hibernation.  That
is, check more details about the S4 resume failure (not hang) with
DEFAULT_SLEEP=kernel.  For example, whether this happens really only with
pm-utils or not, etc.