APM gets re-enabled after awake from suspend

[Karol Babioch]

Hi,

my hard drive suffers from the "clicking" problem, therefore I
deactivated the APM (Advanced Power Management) totally.

I'm doing this using hdparm in the /etc/rc.local, making sure that it
gets executed every time I boot up my machine.

However I noticed that the APM gets re-enabled after I wake my machine
up from Suspend-to-RAM, which makes the hard drive clicking again.

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?

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 ;).

--
Best regards,
Karol Babioch <karol@...>

[darose]

On 11/03/2009 03:40 PM, Karol Babioch wrote:
> Hi,
>
> my hard drive suffers from the "clicking" problem, therefore I
> deactivated the APM (Advanced Power Management) totally.

 From what I've heard, clicking means that your drive is dying.  Maybe
time to buy a new one?

HTH,

DR

[Adrian C. (anrxc)]

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.


--
Adrian C. (anrxc) | anrxc..sysphere.org | PGP ID: D20A0618
PGP FP: 02A5 628A D8EE 2A93 996E  929F D5CB 31B7 D20A 0618

[Adrian C. (anrxc)]

On Wed, 4 Nov 2009, Adrian C. wrote:

> Usual practice is that hardware hooks have low or high numbers
> (depending on what they do) and those dealing with software are in
> between.

I found this documented in pm-suspend (8) manual page, Hook Ordering
Convention. Best to read that.


--
Adrian C. (anrxc) | anrxc..sysphere.org | PGP ID: D20A0618
PGP FP: 02A5 628A D8EE 2A93 996E  929F D5CB 31B7 D20A 0618

[Karol Babioch]

Thanks very much, will try to implement a own hook, as there is more to
be done, it was just a sort of simplification, but nevertheless I should
get it working.

--
Best regards,
Karol Babioch <karol@...>