[Bug 59695] Re: High frequency of load/unload cycles on some hard disks may shorten lifetime

Ralph Corderoy ralph at inputplus.co.uk
Thu Jan 15 11:16:03 UTC 2009


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.

-- 
High frequency of load/unload cycles on some hard disks may shorten lifetime
https://bugs.launchpad.net/bugs/59695
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