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[Bug 210780] Re: MTRRs set up incorrectly with 4GB RAM -> X slow

To: ubuntu-x-swat@xxxxxxxxxxxxxxxxxxx
From: Nigel Pallett <210780@xxxxxxxxxxxxxxxxxx>
Date: Fri, 18 Mar 2011 14:22:44 -0000
Reply-to: Bug 210780 <210780@xxxxxxxxxxxxxxxxxx>
Sender: bounces@xxxxxxxxxxxxx

I have a laptop intel i3 CPU with Intel HD GPU with 6GB ram running
Ubuntu 10.10 64 bit.

I get the following error in dmesg:

[drm] MTRR allocation failed.  Graphics performance may suffer.

When I run "mtrr-uncover" , I get the following:

Initial MTRR configuration:
 0  0x000000000-0x1ffffffff write-back
         2  0x0dc000000-0x0dfffffff uncachable
         1  0x0e0000000-0x0ffffffff uncachable
         6  0x17c000000-0x17fffffff uncachable
         5  0x19c000000-0x19fffffff uncachable
         4  0x1a0000000-0x1bfffffff uncachable
         3  0x1c0000000-0x1ffffffff uncachable
./mtrr-uncover: 10 MTRRs needed but only 8 in architecture.

Can anyone help me with problem ?

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https://bugs.launchpad.net/bugs/210780

Title:
  MTRRs set up incorrectly with 4GB RAM -> X slow