• Karol Herbst's avatar
    drm/nouveau: workaround runpm fail by disabling PCI power management on certain intel bridges · 434fdb51
    Karol Herbst authored
    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: default avatarKarol 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: default avatarBen Skeggs <bskeggs@redhat.com>
    434fdb51
nouveau_drm.c 34.4 KB