No - is it needed for suspend to RAM?
Suspend to RAM is working on the command line using
echo mem > /sys/power/state
just not any other way.
There is probably some hook that pm-suspend is failing on and pm-suspends handles a lot of quirks that sit on top of a hardware suspend.
Take a look at
/var/log/pm-suspend.log
and see if you have any failure messages.
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