drm/nouveau: Fix backlight control on PPC machines with an internal TMDS panel.
This commit fixes fdo bug 29685. Reported-by: NVlado Plaga <rechner@vlado-do.de> Signed-off-by: NFrancisco Jerez <currojerez@riseup.net> Signed-off-by: NBen Skeggs <bskeggs@redhat.com>
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