1 files changed, 2 insertions, 0 deletions

diff --git a/drivers/gpu/drm/radeon/radeon_atombios.c b/drivers/gpu/drm/radeon/radeon_atombios.c
index f0ea7f8da67..1fff95505cf 100644
--- a/drivers/gpu/drm/radeon/radeon_atombios.c
+++ b/drivers/gpu/drm/radeon/radeon_atombios.c
@@ -264,6 +264,8 @@ static bool radeon_atom_apply_quirks(struct drm_device *dev,
                 if ((supported_device == ATOM_DEVICE_CRT1_SUPPORT) ||
                     (supported_device == ATOM_DEVICE_DFP2_SUPPORT))
                         return false;
+                if (supported_device == ATOM_DEVICE_CRT2_SUPPORT)
+                        *line_mux = 0x90;
         }
 
         /* ASUS HD 3600 XT board lists the DVI port as HDMI */