drm/nouveau/acpi: fix check for power resources support
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: 692a17dc ("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@gmail.com> Reviewed-by:
Mika Westerberg <mika.westerberg@linux.intel.com> Cc: stable@vger.kernel.org # v4.8+ Signed-off-by:
Peter Wu <peter@lekensteyn.nl> Signed-off-by:
Dave Airlie <airlied@redhat.com>
parent
5f7f8f6e
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