[Bug 292619] Re: Kernel panic on boot if SMP (ASUS M3A-H/HDMI)

[Stefan Bader]

Fix committed to Hardy (target 2.6.24-24.54)

** Changed in: linux (Ubuntu Hardy)
       Status: In Progress => Fix Committed

** Description changed:

+ SRU Justification:
+ 
+ Impact: The BIOS is expected to clear the SYSCFG[MtrrFixDramModEn] on AMD CPUs
+ after fixed MTRRs are configured. Some BIOSes do not clear SYSCFG[MtrrFixDramModEn] on BP (and on APs), which leads to panics and freezes.
+ 
+ Fix: Attached patch from upstream which is included in Jaunty and has
+ been verified to help on Intrepid too.
+ 
+ Testcase: see bug report.
+ 
+ ---
+ 
  Binary package hint: linux-image-2.6.27-7-server
  
  Latest working kernel version: Doesn't work with any ubuntu versions of
  the kernel that I know of. Latest tried is 2.6.26-7-server. Does
  apparently work with the latest official stable 2.6.24.7 linux mainline
  kernel on a down-cored Phenom CPU according to
  http://bugzilla.kernel.org/show_bug.cgi?id=11714#c38.
  
  Earliest failing kernel version: The earliest failing version that I
  know about is 2.6.24-19-server. Have also tried a linux-image-generic
  kernel.
  
  Distribution: Ubuntu 8.10
  
  Hardware Environment: ASUS M3A-H/HDMI, 4GB RAM, AMD PHENOM X3 8750,
  4xSATA, 256MB Radeon 2400 PRO PCI Express.
  
  Software Environment:  Ubuntu 64bit server edition. Using the latest
  available bios update (Version 1001)
  
  Problem Description: When not using acpi=off or acpi=ht, the system goes
  straight into kernel panic. This occurs on or after installation.
  
  Steps to reproduce: Use the same hardware set-up as me. Boot into
  ubuntu.
  
  Note: I have also reported this as a mainline linux bug and the full
  history and a lot of information (dmesg output, acpidump output, kernel
  panic screen shots etc.) can be found here:
  http://bugzilla.kernel.org/show_bug.cgi?id=11714. Support there have
  helped identify this as a CPUID4 problem, but can only fix it if I
  reproduce it using a mainline linux kernel. I'd like to stick with
  ubuntu. In this case they say I'll have get ubuntu support to help me
  fix it. (See comment 50 here:
  http://bugzilla.kernel.org/show_bug.cgi?id=11714#c50)

-- 
Kernel panic on boot if SMP (ASUS M3A-H/HDMI)
https://bugs.launchpad.net/bugs/292619
You received this bug notification because you are a member of Kernel
Bugs, which is subscribed to Linux.