workaround until the packaging is done and tested:

1. get the microcode from www.amd64.org, Do validate the gpg signature, do not 
use the microcode if the signature is invalid!
2. unpack and install the bin files to /lib/firmware/amd-ucode
3. use /etc/modules to load the microcode module on boot
4. test it and load it on the cpu using "rmmod microcode ; sleep 2 ; modprobe 
microcode"
5. if your kernel is not new enough for the new microcode (family 15h), it 
won't be loaded. Ask someone in the kernel team to backport the relevant driver.

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https://bugs.launchpad.net/bugs/706650

Title:
  [need-packaging] AMD microcode update

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