powersave-policy-sata-link-power breaks pm-powersave: 
I stumbled upon the same problem when looking why my own powersave script 
/usr/lib/pm-utils/power.d/zztlp is not executed. 

How to reproduce: 
The problem occurs when an sata controller is run in compatible mode. 
pm-powersave.log then shows

/usr/lib/pm-utils/power.d/95hdparm-apm false:
/dev/sda:
 setting Advanced Power Management level to 0xfe (254)
 APM_level      = 254
success.
/usr/lib/pm-utils/power.d/anacron false:success.
/usr/lib/pm-utils/power.d/powersave-policy-dirty-writeback false:success.
/usr/lib/pm-utils/power.d/powersave-policy-hda-powerdown false:success.
/usr/lib/pm-utils/power.d/powersave-policy-sata-link-power false:Returned exit 
code 1.
<<< remaining scripts are not executed >>>

When I switch the controller to AHCI-Mode everything is fine:

/usr/lib/pm-utils/power.d/95hdparm-apm false:
/dev/sda:
 setting Advanced Power Management level to 0xfe (254)
 APM_level      = 254
success.
/usr/lib/pm-utils/power.d/anacron false:start: Job is already running: anacron
success.
/usr/lib/pm-utils/power.d/powersave-policy-dirty-writeback false:success.
/usr/lib/pm-utils/power.d/powersave-policy-hda-powerdown false:success.
/usr/lib/pm-utils/power.d/powersave-policy-sata-link-power false:success.
/usr/lib/pm-utils/power.d/sched-powersave false:**sched policy powersave OFF
success.
/etc/pm/power.d/tlp-userdaemons false:success.
/usr/lib/pm-utils/power.d/zztlp false:success.

Hardware tested: ThinkPad T43, T60, X200

I suspect the problem is the same with pata controllers, but i lack the
hardware to test.

-- 
powersave-policy-sata-link-power false:Returned exit code 1.
https://bugs.launchpad.net/bugs/514881
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