[PATCH] acpi: fan after suspend-to-mem fix

[PATCH] acpi: fan after suspend-to-mem fix

[Tommi Kyntola]

acpi_fan_suspend should probably set state to ACPI_D3, rather than ACPI_D0.
With this change the fan works after S3 suspend atleast on HP nw8000 laptop,
for which the suspended fan has been broken since sword-and-stone.

Signed-off-by: Tommi Kyntola <tommi.kyntola@ray.fi>
---
Why this was ACPI_D0 beats me, but it's been that way since
the _suspend/_resume functios got added in the commit
0feabb01d93e5801d1127416a66cfc3963280bca (2.6.18-rc1, I think).

The fan hasn't worked on my HP nw8000 laptop after an S3 suspend
ever, but fixing that to ACPI_D3 there finally makes it work as
expected.

If there was some hidden reason why that was set to ACPI_D0,
then perhaps a config option for some ICH4 or HP laptops
is called for.

         Kynde

diff --git a/drivers/acpi/fan.c b/drivers/acpi/fan.c
index 045c894..7ae70b0 100644
--- a/drivers/acpi/fan.c
+++ b/drivers/acpi/fan.c
@@ -243,7 +243,7 @@ static int acpi_fan_suspend(struct acpi_device *device, int state)
         if (!device)
                 return -EINVAL;

-       acpi_bus_set_power(device->handle, ACPI_STATE_D0);
+       acpi_bus_set_power(device->handle, ACPI_STATE_D3);

         return AE_OK;
  }

Re: [PATCH] acpi: fan after suspend-to-mem fix

[Pavel Machek]

Hi!

> The fan hasn't worked on my HP nw8000 laptop after an S3 
> suspend
> ever, but fixing that to ACPI_D3 there finally makes it 
> work as
> expected.
> 
> If there was some hidden reason why that was set to 
> ACPI_D0,

You do not want to overheat while suspending.

(Yep, I'm doing some time travel in my spare time, sorry about that).


> @@ -243,7 +243,7 @@ static int acpi_fan_suspend(struct 
> acpi_device *device, int state)
>         if (!device)
>                 return -EINVAL;
> 
> -       acpi_bus_set_power(device->handle, 
> ACPI_STATE_D0);
> +       acpi_bus_set_power(device->handle, 
> ACPI_STATE_D3);
> 
>         return AE_OK;
>  }
> 
> -
> To unsubscribe from this list: send the line 
> "unsubscribe linux-kernel" in
> the body of a message to majordomo@vger.kernel.org
> More majordomo info at  
> http://vger.kernel.org/majordomo-info.html
> Please read the FAQ at  http://www.tux.org/lkml/

-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html