[GRLUG] random loss of local keyboard

[John-Thomas Richards]

On Thu, Jul 05, 2012 at 04:34:05PM -0400, Michael Mol wrote:
> On Thu, Jul 5, 2012 at 4:25 PM, John-Thomas Richards <jtr at jrichards.org> wrote:
> > On Thu, Jul 05, 2012 at 04:05:32PM -0400, Michael Mol wrote:
> >> On Thu, Jul 5, 2012 at 4:03 PM, John-Thomas Richards <jtr at jrichards.org> wrote:
> >> > On Thu, Jul 05, 2012 at 03:53:06PM -0400, Michael Mol wrote:
> >> >> On Thu, Jul 5, 2012 at 3:45 PM, John-Thomas Richards <jtr at jrichards.org> wrote:
> >> >> > On Thu, Jul 05, 2012 at 03:37:35PM -0400, John-Thomas Richards wrote:
> 
> [snip]
> 
> >> >> >> Jul  5 14:32:19 auerbach kernel: [19029.452136] [Hardware Error]: Machine check events logged
> >> >>
> >> >> This is the line you should really care about. You have failing
> >> >> hardware somewhere, and the kernel logged it.
> >> >>
> >> >> I think this page would set you in the right direction to identifying
> >> >> what's going on:
> >> >>
> >> >> https://en.wikipedia.org/wiki/Machine_Check_Exception#Decoding_MCEs
> >> >
> >> > Thanks!  I'm checking it now.
> >> >
> >> >> ...but a random stab. The weather's been crazy hot lately. Is that
> >> >> machine in a well-cooled room?
> >> >
> >> > It's in my office...so no.  It's not.  AC is running but I'm still
> >> > sweating.
> >>
> >> Semi-related. Do you have power management configured? I.e. CPU
> >> underclocked when not in use, GPU underclocked when not in use, that
> >> kind of thing? If not, that would probably be a good idea for now.
> >
> > Yes; I just checked the logs again and saw this:
> >
> > Jul  5 15:59:52 auerbach mcelog: Processor 7 heated above trip temperature. Throttling enabled.
> > Jul  5 15:59:52 auerbach mcelog: Please check your system cooling. Performance will be impacted
[snip]
> > Jul  5 15:59:52 auerbach mcelog: Processor 5 below trip temperature. Throttling disabled
[snip]
> > (I just installed mcelog in response to your suggestion.)
> 
> Set your CPU governer to "conservative" or even "powersave" until the
> heat wave passes. You've got eight cores, you'll be fine. :)

It's currently on "ondemand"; I almost never see it running at full
speed (2.2GHz) but most often at either 800MHz or 1.3GHz.  Now to find
out how to change from ondemand to conservative...

> Similarly, find out if your GPU has power settings you can tweak downward.

That's running at Adaptive mode.  Curiously, I'm not running any video
or graphically demandings apps (an xterm, Chromium, and the nVidia app)
and it keeps jumped up to the highest performance level.  Not sure
why.
-- 
john-thomas
------
Think like a wise man but communicate in the language of the people.
William Butler Yeats, poet, dramatist, essayist, Nobel laureate (1865-1939)