diff --git a/src/radeon_output.c b/src/radeon_output.c
index 712ac5f..88e5088 100644
--- a/src/radeon_output.c
+++ b/src/radeon_output.c
@@ -1163,7 +1163,7 @@ radeon_create_resources(xf86OutputPtr output)
 		       "RRConfigureOutputProperty error, %d\n", err);
 	}
 
-	data = 1; /* coherent mode on by default */
+	data = 0; /* coherent mode on by default */
 
 	err = RRChangeOutputProperty(output->randr_output, coherent_mode_atom,
 				     XA_INTEGER, 32, PropModeReplace, 1, &data,
@@ -1862,7 +1862,7 @@ void RADEONInitConnector(xf86OutputPtr output)
 	RADEONGetTVInfo(output);
 
     if (radeon_output->devices & (ATOM_DEVICE_DFP_SUPPORT))
-	radeon_output->coherent_mode = TRUE;
+	radeon_output->coherent_mode = FALSE;
 
     if (radeon_output->ddc_i2c.valid)
 	RADEONI2CInit(pScrn, &radeon_output->pI2CBus, output->name, &radeon_output->ddc_i2c);