drm/radeon: disable native backlight control on pre-r6xx asics (v2)
commit b7bc596e upstream. Just use the acpi interface. That's what windows uses on this generation and it's the only thing that seems to work reliably on these generation parts. You can still force the native backlight interface by setting radeon.backlight=1 Bug: https://bugzilla.kernel.org/show_bug.cgi?id=88501 v2: merge into above if/else block Signed-off-by:Alex Deucher <alexander.deucher@amd.com> Signed-off-by:
Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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