Comment 6 for bug 229693

I'd be curious to see if hdparm settings were added to the pm-utils/power.d/laptop-tools script whether it would persist over a sleep cycle. Either 1) Yes, like the other settings normally do or 2) No, because there is something else going on. In this second case, we haven't got to the source of the problem -- either 1) that something outside of acpi/pm-utils is resetting or over-riding hdparm after resume from sleep (suspend) where it is allowing the apm setting to persist over power state and power cycles (shutdown/boot and reboot) or 2) hdparm normally runs on all these occasions but doesn't seem to be recognizing sleep/resume. Either way, that seems to point to a problem OUTSIDE of acpi and pm-utils.

So there are two dynamics:
1) other acpi/pm-utils hdd settings that persist over sleep cycles
2) other changes in power state (ac/batt/shutdown) that either properly execute hdparm or leave the apm alone

I am definitely not an "expert" as mentioned above, and have no clue how to chase down the culprit