Comment 5 for bug 1200533

The AMD microcode coming from linux-firmware - 1.79.6 is freezing 99% of the times my 5 Dell PowerEdge M915 blades (4x64 Cores Opteron 6274, currently with 3.0.4 BIOS).

This happens both at boot and also if I blacklist the 'microcode' module and then I run 'modprobe microcode' after the system is up. To have always a successful boot I had to blacklist the microcode module.

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Description: Ubuntu 12.04.3 LTS
Release: 12.04
Linux marley 3.8.0-31-generic #46~precise1-Ubuntu SMP Wed Sep 11 18:21:16 UTC 2013 x86_64 x86_64 x86_64 GNU/Linux
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root@marley:~# dpkg -S /lib/firmware/amd-ucode/microcode_amd*
linux-firmware: /lib/firmware/amd-ucode/microcode_amd.bin
linux-firmware: /lib/firmware/amd-ucode/microcode_amd.bin.asc
linux-firmware: /lib/firmware/amd-ucode/microcode_amd_fam15h.bin
linux-firmware: /lib/firmware/amd-ucode/microcode_amd_fam15h.bin.asc

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root@marley:~# apt-cache show linux-firmware
Package: linux-firmware
Priority: optional
Section: misc
Installed-Size: 41502
Maintainer: Ubuntu Kernel Team <email address hidden>
Architecture: all
Version: 1.79.6
Replaces: atmel-firmware, linux-restricted-common
Provides: atmel-firmware
Conflicts: atmel-firmware
Filename: pool/main/l/linux-firmware/linux-firmware_1.79.6_all.deb
Size: 23217718
MD5sum: b774085d0ad3bb87bdf60b9590df1ba6
SHA1: 89ce403513450402be1190659ddbe1c9ed9db54e
SHA256: 5945561ab9bffbf9d91d618bf9fe5862b9d42abdff797429bc75b8d034b7fb28
Description-en: Firmware for Linux kernel drivers
 This package provides firmware used by Linux kernel drivers.
Multi-Arch: foreign
Description-md5: 7a047bff9e44dce458a300976c12f9da
Bugs: https://bugs.launchpad.net/ubuntu/+filebug
Origin: Ubuntu
Supported: 5y

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dmidecode attached