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[Tarjei Huse <930007@xxxxxxxxxxxxxxxxxx>]

Hi, I'm seeing this on a i7 server with 32Gs of RAM as well. It runs
raring. Should I post any info on this bug or do you want a separate bug
?

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https://bugs.launchpad.net/bugs/930007

Title:
  When booting with 32GB ram linux fails to find optimal mtrr when i915
  (HD 3000) has 512 MB Ram

Status in The Linux Kernel:
  Confirmed
Status in “linux” package in Ubuntu:
  Incomplete

Bug description:

  I have an ASUS P8Z68-V PRO,  W/ BIOS 1101, 32GB of RAM and I am
  running Ubuntu precise 12.04.

  In the BIOS you can set the amount of memory for the "iGPU", the
  HD3000 GPU built into my i7-2600K.

  I just upgraded to 32GB of ram.  Before the upgrade, I had this set to
  512,   had mtrr_spare_reg_nr=1 and everything worked fine.  After the
  upgrade: mtrr_cleanup: can not find optimal value, please specify
  mtrr_gran_size/mtrr_chunk_size etc.  No matter what I set
  mtrr_spare_reg_nr to I got this error.  However, I found that if I
  turned the amount of memory for the iGPU down to 256, everything works
  again.

   The  dmesg and other info for when the setting was at 512 can be
  found on the Post I made before  i discovered that changing the iGPU
  to having 256mb would fix it at
  http://ubuntuforums.org/showthread.php?p=11677053

  After changing iGPU to 256, here is the /proc/mttr
  /proc/mtrr
  reg00: base=0x000000000 (    0MB), size= 2048MB, count=1: write-back
  reg01: base=0x080000000 ( 2048MB), size= 1024MB, count=1: write-back
  reg02: base=0x0bf800000 ( 3064MB), size=    8MB, count=1: uncachable
  reg03: base=0x100000000 ( 4096MB), size= 4096MB, count=1: write-back
  reg04: base=0x200000000 ( 8192MB), size= 8192MB, count=1: write-back
  reg05: base=0x400000000 (16384MB), size=16384MB, count=1: write-back
  reg06: base=0x800000000 (32768MB), size=  512MB, count=1: write-back
  reg07: base=0x820000000 (33280MB), size=  256MB, count=1: write-back
  reg08: base=0x82fe00000 (33534MB), size=    2MB, count=1: uncachable
  reg09: base=0x0d0000000 ( 3328MB), size=  256MB, count=1: write-combining

  and the dmesg is attached.

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