turning off individual devices

turning off individual devices

[Keld Jørn Simonsen]

I try to turn off individual devices by saying

   echo -n 4 >  /sys/devices/pci0000:00/0000:00:1f.6/detach_state

But it seems that nothing happens. Am I missing something?
Kernel 2.6.3

Keld


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Re: turning off individual devices

[Dino Klein]

check kernel/Documentation/power/devices.txt
the value there indicates in which state to put the device after the driver detaches from it.

----- Original Message ----- 
From: "Keld Jørn Simonsen" <keld-6PR53cSIHaE@public.gmane.org>
To: <acpi-devel-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5f@public.gmane.org>
Sent: Friday, March 05, 2004 5:21 PM
Subject: [ACPI] turning off individual devices


> I try to turn off individual devices by saying
>
>    echo -n 4 >  /sys/devices/pci0000:00/0000:00:1f.6/detach_state
>
> But it seems that nothing happens. Am I missing something?
> Kernel 2.6.3
>
> Keld
>
>
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Re: turning off individual devices

[Keld Jørn Simonsen]

On Fri, Mar 05, 2004 at 11:21:37PM -0500, Dino Klein wrote:
> check kernel/Documentation/power/devices.txt
> the value there indicates in which state to put the device after the driver detaches from it.

Yes, I did read that document before posting. That document says that:
A value of 4 indicates that the device should be shutdown, so
->shutdown() will be called for that device.

But it does not seem to have an effect.
And I do not seem to have a driver running for that device.

But does that matter whether the device is in use or not?
Or should there be an error message if the device is in use?

> ----- Original Message ----- 
> From: "Keld Jørn Simonsen" <keld-6PR53cSIHaE@public.gmane.org>
> To: <acpi-devel-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5f@public.gmane.org>
> Sent: Friday, March 05, 2004 5:21 PM
> Subject: [ACPI] turning off individual devices
> 
> 
> > I try to turn off individual devices by saying
> >
> >    echo -n 4 >  /sys/devices/pci0000:00/0000:00:1f.6/detach_state
> >
> > But it seems that nothing happens. Am I missing something?
> > Kernel 2.6.3
> >
> > Keld


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Re: turning off individual devices

[Dino Klein]

As I said, according to the docs "detach_state" is the state in which to put the device after you "rmmod" its driver, so I wouldn't
expect any immediate results when you put any value into it.
Also, you might want to take a look at a posting I just did to the kernel list, titled "PCI, PM, & sysfs interaction", which is the
result of playing around with "/sys/..../power/state", trying to get my NIC into D1/D2/D3. The conclusions from my experiment is
that it is rather broken.


----- Original Message ----- 
From: "Keld Jørn Simonsen" <keld-6PR53cSIHaE@public.gmane.org>
To: "Dino Klein" <dinoklein-PkbjNfxxIARBDgjK7y7TUQ@public.gmane.org>
Cc: "Keld Jørn Simonsen" <keld-6PR53cSIHaE@public.gmane.org>; <acpi-devel@lists.sourceforge.net>
Sent: Sunday, March 07, 2004 4:06 AM
Subject: Re: [ACPI] turning off individual devices


On Fri, Mar 05, 2004 at 11:21:37PM -0500, Dino Klein wrote:
> check kernel/Documentation/power/devices.txt
> the value there indicates in which state to put the device after the driver detaches from it.

Yes, I did read that document before posting. That document says that:
A value of 4 indicates that the device should be shutdown, so
->shutdown() will be called for that device.

But it does not seem to have an effect.
And I do not seem to have a driver running for that device.

But does that matter whether the device is in use or not?
Or should there be an error message if the device is in use?

> ----- Original Message ----- 
> From: "Keld Jørn Simonsen" <keld-6PR53cSIHaE@public.gmane.org>
> To: <acpi-devel-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5f@public.gmane.org>
> Sent: Friday, March 05, 2004 5:21 PM
> Subject: [ACPI] turning off individual devices
>
>
> > I try to turn off individual devices by saying
> >
> >    echo -n 4 >  /sys/devices/pci0000:00/0000:00:1f.6/detach_state
> >
> > But it seems that nothing happens. Am I missing something?
> > Kernel 2.6.3
> >
> > Keld



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