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diff -up xf86-video-cirrus-1.3.2/src/alp_driver.c.jx xf86-video-cirrus-1.3.2/src/alp_driver.c
--- xf86-video-cirrus-1.3.2/src/alp_driver.c.jx 2012-04-02 16:30:29.000000000 -0400
+++ xf86-video-cirrus-1.3.2/src/alp_driver.c 2012-04-02 16:33:11.668580522 -0400
@@ -476,6 +476,7 @@ AlpPreInit(ScrnInfoPtr pScrn, int flags)
vgaHWPtr hwp;
MessageType from, from1;
int i;
+ int defaultdepth;
int depth_flags;
ClockRangePtr clockRanges;
char *s;
@@ -557,11 +558,18 @@ AlpPreInit(ScrnInfoPtr pScrn, int flags)
depth_flags |= Support32bppFb |
SupportConvert32to24 |
PreferConvert32to24;
+
+ /* use 16bpp in virt */
+ if ((pCir->PciInfo->subvendor_id & 0xffff) == 0x1af4)
+ defaultdepth = 16;
+ else
+ defaultdepth = 24;
+
/*
* The first thing we should figure out is the depth, bpp, etc.
* We support both 24bpp and 32bpp layouts, so indicate that.
*/
- if (!xf86SetDepthBpp(pScrn, 0, 0, 24, depth_flags)) {
+ if (!xf86SetDepthBpp(pScrn, 0, 0, defaultdepth, depth_flags)) {
return FALSE;
} else {
/* Check that the returned depth is one we support */
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