[Nouveau] Acer Aspire V7-582PG (Haswell, GTX 750M) fails to power off GPU via Power Resources

Peter Wu peter at lekensteyn.nl
Thu Oct 27 16:06:48 UTC 2016

On Thu, Oct 27, 2016 at 12:55:08PM +0300, Mika Westerberg wrote:
> On Thu, Oct 27, 2016 at 09:42:28AM +0000, Rick Kerkhof wrote:
> >    No, there are not. Here is the recursive directory listing:
> Are you able to try the following patch and send me dmesg (or attach it
> to that bug)? It should show if the ACPI core even tries to add those
> power resources.

So Rick has tested this patch now on top of 4.8.4 (mainline fails to
boot due to a kbuild issue which I reported elsewhere), but the output
is empty. That seems to indicate that flags.power_resources is unset.

Given that _PS3 exists and is indeed a package with some elements, it
seems that acpi_extract_power_resources is failing. Note that in the
SSDT, the power resource NVP3 was referenced before it was defined,
could that result in this enumeration failure? Relevant SSDT excerpt:

    Scope (\_SB.PCI0.RP05)
        Name (_PR3, Package (0x01)  // _PR3: Power Resources for D3hot
        // ...

    PowerResource (NVP3, 0x00, 0x0000)

Kind regards,

> diff --git a/drivers/acpi/power.c b/drivers/acpi/power.c
> index fcd4ce6f78d5..af9c3e15dd74 100644
> --- a/drivers/acpi/power.c
> +++ b/drivers/acpi/power.c
> @@ -444,6 +444,9 @@ void acpi_power_add_remove_device(struct acpi_device *adev, bool add)
>  	if (!adev->power.flags.power_resources)
>  		return;
> +	acpi_handle_info(adev->handle, "Adding power resources for %s\n",
> +			 dev_name(&adev->dev));
> +
>  	for (state = ACPI_STATE_D0; state <= ACPI_STATE_D3_HOT; state++)
>  		acpi_power_expose_hide(adev,
>  				       &adev->power.states[state].resources,

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