Comment 716 for bug 59695

After installing acpi-support 0.109-0hardy1 this morning on 8.04, the motherboard's drive LED on the case stayed on. Executing a `hdparm -B 254 /dev/sdb' half an hour later turned it off. /var/log/apt/term.log shows

    * Checking battery state...
   /dev/sdb:
    setting Advanced Power Management level to 0x80 (128)

and hdparm -I confirmed this was the setting while the LED was stuck on. This is not a laptop; there's no battery and I don't want a -B of 128 but 254. It seems the scripts don't distinguish between on_ac_power(1) returning 1, we know system is not on mains, and 255, we couldn't find out either way. On this machine,

    $ on_ac_power; echo $?
    255

I think it should err on the side of this probably not being a laptop with a battery if the hardware is such, e.g. old, that on_ac_power returns 255.