kernel-packages team mailing list archive

["Christopher M. Penalver" <christopher.m.penalver@xxxxxxxxx>]

Tarjei Huse, if you have a bug in Ubuntu, the Ubuntu Kernel team, Ubuntu Bug Control team, and Ubuntu Bug Squad would like you to please file a new report by executing the following in a terminal while booted into a Ubuntu repository kernel (not a mainline one) via:
ubuntu-bug linux

For more on this, please read the official Ubuntu documentation:
Ubuntu Bug Control and Ubuntu Bug Squad: https://wiki.ubuntu.com/Bugs/BestPractices#X.2BAC8-Reporting.Focus_on_One_Issue
Ubuntu Kernel Team: https://wiki.ubuntu.com/KernelTeam/KernelTeamBugPolicies#Filing_Kernel_Bug_reports
Ubuntu Community: https://help.ubuntu.com/community/ReportingBugs#Bug_reporting_etiquette

When opening up the new report, please feel free to subscribe me to it.

Please note, not filing a new report would delay your problem being
addressed as quickly as possible.

No need exists to comment here at this time. After reading the above
documentation in it's entirety, if you have further questions, you are
welcome to redirect them to the appropriate mailing list or forum via
http://www.ubuntu.com/support/community/mailinglists , or you may
contact me directly.

Thank you for your understanding.

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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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