random laptop power outages with Ubuntu 16.04.1

Liam Proven lproven at gmail.com
Wed Nov 30 18:46:50 UTC 2016


On 30 November 2016 at 19:29, Jason Paul Joines <jason at joines.org> wrote:
>         When it last crashed I was watching the temperature via
> xsensors.  Both cores were around 38 °C.  Periodically one would jump up
> to 56 °C for just a second, but then drop back down.  That seems to be
> too cool to be an overheating issue.

You're right, it does.

>         Although, I left it running Memtest86+ 5.01 last night.  When I
> came in this morning, the machine was locked up.  It seems like it did
> not find any errors, but also did not complete a pass:
>
> Pass 21%
> Test 81%
> Test #7 [BLock_move]
> Testing:  4096 M - 6144 M    2048 M of 7988 M
> Pattern:                    | Time: 0:03:34
> Pass: 0        Errors: 0

Ouch. That _definitely_ sounds like a hardware issue. I have isolated
quite a lot of RAM faults with MemTest over the years, and it's so
tiny that as long as the few hundred kB of RAM that it fits in are OK,
it runs for days. So either the very beginning of RAM is damaged --
swapping SIMMs around is worth a try -- or the machine has serious
issues, probably terminal. :-(


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