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-rw-r--r--src/atombios_output.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/src/atombios_output.c b/src/atombios_output.c
index 003b8f88..5ccf50d1 100644
--- a/src/atombios_output.c
+++ b/src/atombios_output.c
@@ -729,7 +729,7 @@ atombios_output_dig_transmitter_setup(xf86OutputPtr output, int action, uint8_t
}
// select the PLL for the UNIPHY
- if (radeon_output->MonType == MT_DP)
+ if (radeon_output->MonType == MT_DP && info->dp_extclk)
disp_data.v3.acConfig.ucRefClkSource = 2; /* ext clk */
else
disp_data.v3.acConfig.ucRefClkSource = radeon_output->pll_id;