[Bug 103351] Machine check exception on Broadwell quad-core with SpeedStep enabled

[bugzilla-daemon@bugzilla.kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=103351

Fredrik Atmer <fredrik+kernel@atmer.se> changed:

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                 CC|                            |fredrik+kernel@atmer.se

--- Comment #57 from Fredrik Atmer <fredrik+kernel@atmer.se> ---
First, thank you, thank you, thank you =)

I've had my setup i5-5675C on an Asus H97I-Plus motherboard for some time now.
It's not until now that it actually "works". I was afraid something was broken
in my system due to random crashes.

I first tried to install Ubuntu 15.04, but the installer kept crashing. So I
tried 14.04 which worked. Turns out I needed 14.10 for the Intel graphic
drivers. That worked as well. Well, Unity didn't, and I kind of like it.. So
I've been running Metacity since, with the few random crashes. Then I just
realized 14.10 is no more. Then at 3:30 AM I find this thread. I did sleep
first, but the day after I was able to do a dist-upgrade of my 14.10 system to
15.04 using the 0x12 microcode (I used to have 0xd).

This has to be the most haxxor I ever did. Now I'm running Unity without
problems so far in 15.04, Speedstep and Turbo active. I always thought
microcode was something embedded in the processor, not to be accessed from the
outside world.

I'm using the script from the git repository. It works, but the
--persist-debian option fails to make it persistent. I don't know if I'm using
it incorrectly, and I'm happy to provide more information if requested. I also
tried the method with iucode-tool described above, with the same result. The
install.sh script does just that, right?

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