The MGA DDX still defaults to XAA because the EXA support is buggy on some
hardware. Unfortunately, XAA support is gone from newer versions of the
xserver. If only EXA is present, that is usually better than no accel, so use
it by default. Patch to default to EXA when lacking XAA inspired by r128.
--- src/mga_driver.c.orig 2015-05-24 00:21:50 UTC
+++ src/mga_driver.c
@@ -1911,7 +1911,11 @@ MGAPreInit(ScrnInfoPtr pScrn, int flags)
char *s = xf86GetOptValString(pMga->Options, OPTION_ACCELMETHOD);
#endif
pMga->NoAccel = FALSE;
+#if defined(USE_EXA) && !defined(USE_XAA)
+ pMga->Exa = TRUE;
+#else
pMga->Exa = FALSE;
+#endif
#ifdef USE_EXA
if (!xf86NameCmp(s, "EXA")) {
pMga->Exa = TRUE;
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