2016-05-19 22:26 GMT+03:00 Johan Kragsterman <johan.kragster...@capvert.se>:
>
> Hi!
>
>
> Just want to report a problem here.
>
> Current system is Ubuntu 16.04 server virtual machine(KVM on OmniOS),
> latest LTSP from greek schools repo, fat clients: mo'bo': ASUS J1900I-C -
> mITX, chassi: Chieftec Compact Series IX-03B, 8 GB DDR3L
>
> I been wining on this list about what I thought was a swap problem. Well,
> it wasn't.
>
> The problem occurred right after I switched from UBU 14.04 to 16.04.
>
> I got help to sort out ONE problem, the one with the metacity causing a
> reboot, but that wasn't my main problem.
>
> The main problem was that ONE of my clients were freezing after 1-2 hours.
> And only that client. I couldn't understand, and thought it was a hardware
> problem, I swapped everything, and I mean EVERYTHING, even mo'bo'.
>
> Didn't help...of coarse swapped network cable and switch port as well,
> power bord and PSU. Nothing helped...
>
> Then I started to check the bios, and found out that C-states was enabled
> in that client, and not in the others. It was also enabled in the new
> mo'bo' that I swapped to.
>
> So, disabled C-states and the problem was gone.
>
> Note that this was NOT a problem in 14.04, where the problematic client
> ran fine, with C-states enabled.
>
> I don't know if this is for Ubuntu or LTSP, I just mention it here, so
> people that perhaps get the same problem should know.
>
It sounds like you are hitting this kernel bug:
https://bugzilla.kernel.org/show_bug.cgi?id=109051
We've seen this problem on laptops having Intel Celeron N2940 CPUs and
setting the kernel parameter max_cstate=1 has made them stable so far. I
haven't tried any J1900 boards myself. The kernel bug has been open for
quite some time, so I'd guess that there's no quick fix coming..
Veli-Matti
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