drm/radeon/kms: make sure LVDS panel is valid in detect()
If the panel data is bogus this can lead to problems later when the hardware trys to set the mode. If the data is invalid, report LVDS as disconnected. Should fix fdo bug 24247. Signed-off-by: NAlex Deucher <alexdeucher@gmail.com> Signed-off-by: NDave Airlie <airlied@redhat.com>
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