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--- xf86-video-cirrus-1.5.1/src/alp_driver.c.orig 2012-09-14 14:02:24.477314000 +0200
+++ xf86-video-cirrus-1.5.1/src/alp_driver.c 2012-09-14 14:02:28.610956000 +0200
@@ -775,6 +775,13 @@ AlpPreInit(ScrnInfoPtr pScrn, int flags)
else
xf86SetDDCproperties(pScrn,xf86PrintEDID(
xf86DoEDID_DDC2(XF86_SCRN_ARG(pScrn),pCir->I2CPtr1)));
+
+#ifdef XSERVER_LIBPCIACCESS
+ if (!pScrn->monitor->DDC &&
+ ((pCir->PciInfo->subvendor_id & 0xffff) == 0x1af4)) {
+ pCir->NoAccel = TRUE;
+ }
+#endif
/* Probe the possible LCD display */
AlpProbeLCD(pScrn);
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