If i915 opregion is present, the acpi_video driver doesn't register
itself immediately; it defers that until the i915 opregion code is done.
But if that *fails*, the acpi_video driver was never getting registered.
And thus I have no backlight support on my Lenovo IdeaPad S10-3.
Call acpi_video_register() on the failure path, and it works again.
Signed-off-by: David Woodhouse <email address hidden>
Acked-by: Jesse Barnes <email address hidden>
Acked-by: Matthew Garrett <email address hidden>
Tested-by: Cameron Matheson <email address hidden>
Signed-off-by: Keng-Yu Lin <email address hidden>
Acked-by: Tim Gardner <email address hidden>
Acked-by: Stefan Bader <email address hidden>
Signed-off-by: Brad Figg <email address hidden>