ubuntu-x-swat team mailing list archive

[EclipseAgent <ben.kevan@xxxxxxxxx>]

it is the kernel.. it's the method of PAT forcing back to MTRRs, so this
may be per CPU basis and not related to GPU's.

There has been a work around for those who have installed using the binary (this work around is NOT for third party inclusion)
diff -ru usr/src/nv/nv.c usr/src/nv.572433/nv.c
--- usr/src/nv/nv.c	2009-05-27 03:20:53.000000000 -0700
+++ usr/src/nv.572433/nv.c	2009-07-05 11:31:27.635210006 -0700
@@ -888,6 +888,7 @@
     unsigned int pat1, pat2, i;
     U008 PAT_WC_index;
 
+#if 0 /* disabled */
     if (!test_bit(X86_FEATURE_PAT,
             (volatile unsigned long *)&boot_cpu_data.x86_capability))
     {
@@ -895,6 +896,7 @@
             "NVRM: CPU does not support the PAT, falling back to MTRRs.\n");
         return NV_PAT_MODE_DISABLED;
     }
+#endif
 
     NV_READ_PAT_ENTRIES(pat1, pat2);
     PAT_WC_index = 0xf;

You can get all the info from nvidia's site: 
http://www.nvnews.net/vbulletin/showthread.php?t=133112&page=1

or more directly this post:
http://www.nvnews.net/vbulletin/showpost.php?p=2041755&postcount=29

-- 
Compiz Slow on Karmic w/ NVIDIA and 2.6.30 Kernel
https://bugs.launchpad.net/bugs/391461
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