drm/radeon/kms: try to detect tv vs monitor for underscan
When enabling underscan for hdmi monitors, attempt to detect whether we are driving a TV or a monitor. The should hopefully prevent underscan from being enabled on monitors attached via hdmi that do not overscan the image. Only enable underscan if the mode is a common hdtv mode (480p, 720p, etc.). Signed-off-by: NAlex Deucher <alexdeucher@gmail.com> Signed-off-by: NDave Airlie <airlied@redhat.com>
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