[2.6.12-rc2][suspend] Suspending Thinkpad: drive bay light in S3 mode stays on

[2.6.12-rc2][suspend] Suspending Thinkpad: drive bay light in S3 mode stays on

[Shawn Starr]

I notice in Linux and in XP the drive bay light
remains on while the laptop is in suspend-to-RAM. I
know the ACPI  thinkpad extras added to the kernel
recently can turn this off. I wonder if we can/or need
to write hooks to turn the light off so to conserve
power when we're in S3

Thoughts?

Shawn.


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Re: [2.6.12-rc2][suspend] Suspending Thinkpad: drive bay light in S3 mode stays on

[Pavel Machek]

Hi!

> I notice in Linux and in XP the drive bay light
> remains on while the laptop is in suspend-to-RAM. I
> know the ACPI  thinkpad extras added to the kernel
> recently can turn this off. I wonder if we can/or need
> to write hooks to turn the light off so to conserve
> power when we're in S3
> 
> Thoughts?

You probably want to expand the extras driver to turn it off during
S3.

								Pavel
-- 
Boycott Kodak -- for their patent abuse against Java.


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Re: [2.6.12-rc2][suspend] Suspending Thinkpad: drive bay light in S3 mode stays on

[Matthew Garrett]

On Mon, 2005-04-11 at 16:03 -0400, Shawn Starr wrote:
> I notice in Linux and in XP the drive bay light
> remains on while the laptop is in suspend-to-RAM. I
> know the ACPI  thinkpad extras added to the kernel
> recently can turn this off. I wonder if we can/or need
> to write hooks to turn the light off so to conserve
> power when we're in S3

Just disable it in your suspend script. There's no reason to push that
sort of policy into the kernel.

-- 
Matthew Garrett | mjg59-1xO5oi07KQx4cg9Nei1l7Q@public.gmane.org



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Re: [2.6.12-rc2][suspend] Suspending Thinkpad: drive bay light in S3 mode stays on

[Shawn Starr]

Sure, I suppose you can, but most suspend tools just
echo stuff to /sys (or still /proc/acpi/sleep) which
makes it harder to script it. Besides, when a laptop
goes into suspend to RAM there should be no extra
power   on except a Moon or some other icon.

That said, the ACPI thinkpad extras was designed to do
all of this so why shouldn't the driver do S3 suspend
if it hooks into it already?

Shawn.

--- Matthew Garrett <mjg59-1xO5oi07KQx4cg9Nei1l7Q@public.gmane.org> wrote:
> On Mon, 2005-04-11 at 16:03 -0400, Shawn Starr
> wrote:
> > I notice in Linux and in XP the drive bay light
> > remains on while the laptop is in suspend-to-RAM.
> I
> > know the ACPI  thinkpad extras added to the kernel
> > recently can turn this off. I wonder if we can/or
> need
> > to write hooks to turn the light off so to
> conserve
> > power when we're in S3
> 
> Just disable it in your suspend script. There's no
> reason to push that
> sort of policy into the kernel.
> 
> -- 
> Matthew Garrett | mjg59-1xO5oi07KQx4cg9Nei1l7Q@public.gmane.org
> 
> 


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Re: [2.6.12-rc2][suspend] Suspending Thinkpad: drive bay light in S3 mode stays on

[Matthew Garrett]

On Mon, 2005-04-11 at 16:17 -0400, Shawn Starr wrote:
> Sure, I suppose you can, but most suspend tools just
> echo stuff to /sys (or still /proc/acpi/sleep) which
> makes it harder to script it. Besides, when a laptop
> goes into suspend to RAM there should be no extra
> power   on except a Moon or some other icon.

Most suspend tools are depressingly stupid. That's not a good reason to
push functionality into the kernel. The vast majority of hardware won't
work with that approach at the moment.

> That said, the ACPI thinkpad extras was designed to do
> all of this so why shouldn't the driver do S3 suspend
> if it hooks into it already?

Because, well, strictly it wasn't. The LED control functionality in the
IBM-acpi code exists because it exposes methods that are used by the
BIOS in normal usage. It gives some degree of extra flexibility -
there's no point in removing that for the sake of having one fewer line
of shell in a suspend script. I might want the LEDs to be in different
states depending on what triggered the suspend.

-- 
Matthew Garrett | mjg59-1xO5oi07KQx4cg9Nei1l7Q@public.gmane.org



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