[Nouveau] [PATCH v2] drm/nouveau/acpi: fix check for power resources support

[Alex Deucher]

On Tue, Nov 1, 2016 at 12:55 AM, Dave Airlie <airlied at gmail.com> wrote:
> On 1 November 2016 at 08:48, Peter Wu <peter at lekensteyn.nl> wrote:
>> Check whether the kernel really supports power resources for a device,
>> otherwise the power might not be removed when the device is runtime
>> suspended (DSM should still work in these cases where PR does not).
>>
>> This is a workaround for a problem where ACPICA and Windows 10 differ in
>> behavior. ACPICA does not correctly enumerate power resources within a
>> conditional block (due to delayed execution of such blocks) and as a
>> result power_resources is set to false even if _PR3 exists.
>>
>> Fixes: 692a17dcc292 ("drm/nouveau/acpi: fix lockup with PCIe runtime PM")
>> Link: https://bugs.freedesktop.org/show_bug.cgi?id=98398
>> Reported-and-tested-by: Rick Kerkhof <rick.2889 at gmail.com>
>> Reviewed-by: Mika Westerberg <mika.westerberg at linux.intel.com>
>> Signed-off-by: Peter Wu <peter at lekensteyn.nl>
>
> I've appled it this and cc'ed stable to drm-fixes.
>
> Are we going to get ACPICA fixed?

Looks like we may have hit this on radeon/amdgpu as well:
https://bugs.freedesktop.org/show_bug.cgi?id=98505

Alex

>
> Dave.
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