[arch-general] APM gets re-enabled after awake from suspend

[Adrian C.]

On Tue, 3 Nov 2009, Karol Babioch wrote:

> I'm now wondering whether this is "normal"? I guess so, as the hard
> drive gets disabled during the suspend, and after a wake-up it gets
> re-enabled, so any changed made with hdparm don't get stored. Is this
> intention right?

Your BIOS probably resets it to 127.


> Secondly I want to know what would be the right file (place) to fix
> this. I'll have to execute the hdparm command again, but don't quite
> know where to put it, or at least where it should be put ;).

I just replied to another e-mail from you, regarding pm-utils... and I 
said that it exposes a nice way for writing your own hooks. For example 
you create an executable hook (script) 
/etc/pm/sleep.d/03disk-power-management with contents:


#!/bin/sh
#
# Set HDD advanced power management to it's lowest value.

case "$1" in
         thaw|resume)
                 /sbin/hdparm -B 254 /dev/sda >/dev/null
                 ;;
         *)
                 ;;
esac


Notice I prefixed the name with 03. You can see other pm-utils hooks in 
/usr/lib/pm-utils. When machine is suspending they are executed by the 
order of their names, on resume they are executed in reverse. Above hook 
does nothing on suspend or hibernate, but when waking up it is executed, 
at the end. Usual practice is that hardware hooks have low or high 
numbers (depending on what they do) and those dealing with software are 
in between.


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Adrian C. (anrxc) | anrxc..sysphere.org | PGP ID: D20A0618
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