diff --git a/[refs] b/[refs]
index 41134cb277af..5087a8721c3b 100644
--- a/[refs]
+++ b/[refs]
@@ -1,2 +1,2 @@
 ---
-refs/heads/master: 01cfaf0d12ae5fa092cc916ca4066ee1598e857d
+refs/heads/master: b8cf368944807e29b16b24588a2a35c829bc9d9a
diff --git a/trunk/drivers/video/matrox/g450_pll.c b/trunk/drivers/video/matrox/g450_pll.c
index 440272ad10e7..7c76e079ca7d 100644
--- a/trunk/drivers/video/matrox/g450_pll.c
+++ b/trunk/drivers/video/matrox/g450_pll.c
@@ -331,7 +331,15 @@ static int __g450_setclk(WPMINFO unsigned int fout, unsigned int pll,
 					tmp |= M1064_XPIXCLKCTRL_PLL_UP;
 				}
 				matroxfb_DAC_out(PMINFO M1064_XPIXCLKCTRL, tmp);
+#ifdef __powerpc__
+				/* This is necessary to avoid jitter on PowerPC
+				 * (OpenFirmware) systems, but apparently
+				 * introduces jitter, at least on a x86-64
+				 * using DVI.
+				 * A simple workaround is disable for non-PPC.
+				 */
 				matroxfb_DAC_out(PMINFO M1064_XDVICLKCTRL, 0);
+#endif /* __powerpc__ */
 				matroxfb_DAC_out(PMINFO M1064_XPWRCTRL, xpwrctrl);
 
 				matroxfb_DAC_unlock_irqrestore(flags);