[arch-general] System crash troubleshooting help?

[Michał Zegan]

I am specifically asking about the exact model of your graphic card, and 
the model of your sound card.
As said, I had something similar few times, where sound was playing, 
suddenly started to loop infinitely, and both screen and keyboard/mouse 
become frozen. Even magic sysrq keys did not work, and that means a 
kernel level lockup, but no messages were displayed on the screen so 
(probably) not a panic. If your problem is the same it would be really 
nice to somehow catch it, especially that in my case it is impossible to 
reproduce at all. it doesn't happen for few months and then it starts 
happening once a day for a week.W dniu 07.01.2016 o 23:57, Aron Widforss 
pisze:
> On 01/06/2016 11:25 PM, Michał Zegan wrote:
> > in general, such a lockup means a kernel level lockup or panic, but
> > panics are probably displayed on the console.
> > What hardware do you have? Occassionally something like that happens to
> > me and it always happens when sound is playing, so it may be the same.
>
> It's a XPS 13 9343.
>
> ----
>
> On 01/07/2016 12:50 AM, Mauro Santos wrote:
> > It would be very helpful if you said around which time the machine
> > crashed as that is a lot of log to go through.
>
> That would be at the end of the log. The log is over a single boot.
>
> ----
>
> On 01/07/2016 02:42 AM, Shridhar Daithankar wrote:
> > most importantly, can you reproduce the lockup?  That would be 
> needed to try
> > various fixes/workarounds
>
> I unfortunately cannot. It has happened maybe once a week for a month 
> now. I _think_ that it mostly happens after heavy load and memory 
> usage (mostly Windows 10 WMs), but the CPU time and memory allocation 
> was down to normal at least during the last crash.
>
> I think that I should apply the fixes you suggest, run some stress 
> tests and, if I cannot provoke the crash to occur, wait a couple of 
> weeks.
>
> > Furthermore, in kwin settings, what opengl backend is configured? Does
> > changing to a lower version help? Newer standards of opengl could 
> expose some
> > bugs in the stack.
>
> I'm not completly sure what to look for here, but KInfoCenter says 
> that OpenGL Version is 3.0 Mesa 11.1.0. I guess I could try 
> downgrading this.
>
> > You have i915 graphics. Are you using uxa? That could avoid some 
> lockups.
> >
> > $ cat /etc/X11/xorg.conf.d/20-intel.conf
> > Section "Device"
> >     Identifier  "Intel Graphics"
> >     Driver      "intel"
> >     Option      "AccelMethod"  "uxa"
> > EndSection
>
> Added now.
>
> > and are you using any window decoration other than default? I found 
> that
> > plastic can cause kwin crash rather regularly but it was not a lockup.
>
> Nope, standard Plasma, straight out of the box.
>
> Vänligen,
> Aron Widforss