1 files changed, 8 insertions, 0 deletions

diff --git a/drivers/video/matrox/g450_pll.c b/drivers/video/matrox/g450_pll.c
index 440272ad10e7..7c76e079ca7d 100644
--- a/drivers/video/matrox/g450_pll.c
+++ b/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);