diff --git a/src/radeon_output.c b/src/radeon_output.c
index 0429088..3d92f6e 100644
--- a/src/radeon_output.c
+++ b/src/radeon_output.c
@@ -1316,7 +1316,7 @@ radeon_create_resources(xf86OutputPtr output)
 		       "RRConfigureOutputProperty error, %d\n", err);
 	}
 
-	data = 1; /* coherent mode on by default */
+	data = 0; /* coherent mode off by default */
 
 	err = RRChangeOutputProperty(output->randr_output, coherent_mode_atom,
 				     XA_INTEGER, 32, PropModeReplace, 1, &data,
@@ -2026,7 +2026,7 @@ 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);