drm/nouveau: workaround runpm fail by disabling PCI power management on certain intel bridges
Fixes the infamous 'runtime PM' bug many users are facing on Laptops with Nvidia Pascal GPUs by skipping said PCI power state changes on the GPU. Depending on the used kernel there might be messages like those in demsg: "nouveau 0000:01:00.0: Refused to change power state, currently in D3" "nouveau 0000:01:00.0: can't change power state from D3cold to D0 (config space inaccessible)" followed by backtraces of kernel crashes or timeouts within nouveau. It's still unkown why this issue exists, but this is a reliable workaround and solves a very annoying issue for user having to choose between a crashing kernel or higher power consumption of their Laptops. Signed-off-by:Karol Herbst <kherbst@redhat.com> Cc: Bjorn Helgaas <bhelgaas@google.com> Cc: Lyude Paul <lyude@redhat.com> Cc: Rafael J. Wysocki <rjw@rjwysocki.net> Cc: Mika Westerberg <mika.westerberg@intel.com> Cc: linux-pci@vger.kernel.org Cc: linux-pm@vger.kernel.org Cc: dri-devel@lists.freedesktop.org Cc: nouveau@lists.freedesktop.org Bugzilla: https://bugzilla.kernel.org/show_bug.cgi?id=205623Signed-off-by:
Ben Skeggs <bskeggs@redhat.com>
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