Some rs780 asics seem to be affected as well.

See:
http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=91f3a6aaf280294b07c05dfe606e6c27b7ba3c72
to rs780 as well.

Fixes:
https://bugzilla.kernel.org/show_bug.cgi?id=60791

Signed-off-by: Alex Deucher <alexander.deuc...@amd.com>
Cc: sta...@vger.kernel.org
---
 drivers/gpu/drm/radeon/atombios_encoders.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/radeon/atombios_encoders.c 
b/drivers/gpu/drm/radeon/atombios_encoders.c
index 32923d2..2a761f2 100644
--- a/drivers/gpu/drm/radeon/atombios_encoders.c
+++ b/drivers/gpu/drm/radeon/atombios_encoders.c
@@ -1655,7 +1655,7 @@ radeon_atom_encoder_dpms_dig(struct drm_encoder *encoder, 
int mode)
                         * does the same thing and more.
                         */
                        if ((rdev->family != CHIP_RV710) && (rdev->family != 
CHIP_RV730) &&
-                           (rdev->family != CHIP_RS880))
+                           (rdev->family != CHIP_RS780) && (rdev->family != 
CHIP_RS880))
                                atombios_dig_transmitter_setup(encoder, 
ATOM_TRANSMITTER_ACTION_ENABLE_OUTPUT, 0, 0);
                }
                if (ENCODER_MODE_IS_DP(atombios_get_encoder_mode(encoder)) && 
connector) {
-- 
1.8.3.1

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