[mythtv-users] HELP! 64bit Mythbuntu spontaneously reboots (32bit didn't)

Joseph Fry joe at thefrys.com
Wed Feb 6 03:18:35 UTC 2013


> I recently re-installed Mythbuntu 12.04 64bit on a machine that was
>> running Mythbuntu 11.10 32-bit PAE (without this issue)
>>
>> Everything seems to be working - it records, plays back, does everything
>> OK - except that sometimes the box reboots itself?!
>>
>> There doesn't seem to be any particular trigger that I can work out -
>> last night it crashed while recording as soon as I stopped watching
>> something. It also looks like it crashed overnight while recording, but not
>> playing anything.  Of course it's also been up for sometimes two days
>> without a hitch.
>>
>
>
> So ... more than six months later, I can finally revel the culprit was ...
> THE C-P-U !!! <shocked gasp from the crowd />
>
> I bought a new DVB card, and had thus replaced *everything* in the box
> except the CPU.  The lock-ups & reboots persisted.
>
> Still not wanting to believe it to be true, I only bought a $40 2nd-hand
> core2-duo, replacing my core2-quad.
>
> Lots of problems went away.
>     Crashes (although it's only been 12 hours, so maybe I'm being too
> optimistic).
>     Transcoding didn't work properly either - it missed cut points etc.
>     Running a high-end open-gl screensaver (it shows my photo album while
> idle) used to lock it up
>
> I still need to do some more testing, but *fingers crossed*, it's all
> fixed with the CPU.
>
> Are CPU's repairable ?
>
> I wonder if it's still under warranty ?  Don't think I have the receipt.
>


Nope, not repairable.

While you may have a bad CPU, it could be something else altogether.  You
might not have had good thermal conductivity with the heatsink, may not
have had a good seat in the socket, may have outdated firmware.
 Additionally, you might be able to get away with under-clocking, disabling
a core, increasing voltages, etc.  Finally, I have seen similar issues
caused by a power supply, or the motherboard's power circuits/.

While the two chips you compared are similar in many ways... they may be
very different in terms of the demands they place on other components in
the system... in order to have any assurance that it's the CPU, you would
need to do an apples to apples comparison and replace it with an identical
CPU.
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