Comment 263 for bug 1690085

(In reply to kernel from comment #176)
> I've seen something new on one of my two affected machines. Note I have C6
> *on*, but I'm running stress-ng 24/7 which keeps one core at 100%. The
> machines have been rock-solid since I started doing that, about 3-4 weeks
> uptime now.
>
> Anyway, this message came up on one of them:
> [1905495.738522] Uhhuh. NMI received for unknown reason 3d on CPU 8.
> [1905495.738523] Do you have a strange power saving mode enabled?
> [1905495.738524] Dazed and confused, but trying to continue
>
> I have no idea what to make of this, perhaps it can help.

As per this thread, this message could be due to your GPU, for instance: https://bbs.archlinux.org/viewtopic.php?id=121291