Comment # 14 on bug 917411 from Takashi Iwai

(In reply to macias - from comment #13)
> > Did you have a working kernel beforehand?
> 
> Yes, the same machine on previous installation. I installed OS 13.2 as soon
> as it was launched, no problem for ~4 months, then I reinstalled it, and
> give or take few packages, the only major difference is now I used encrypted
> LVM partition for root. Before reinstall, it worked flawlessly, now it
> freezes.

The question is what triggered the problem.  What's the exact difference from
the previous installation?

> > I guess you misunderstood SysRq.  What's here referred to is the
> > "Magic SysRq" keys.  The key combo Alt+SysRq+something (on a
> > laptop, it's often with Alt+Fn+Print+something) is captured
> > directly by kernel for special tasks.  So it must work no matter
> > which desktop GUI is used.
> 
> Should it work when computer is normally working? Because it does not work,
> I tested it. I get some output only in console, in GUI it was like I didn't
> press it at all.

Yes, magic sysrq works always.  If not, you did something wrong.
It doesn't always *show* on console, of course.  The kernel log is written to
its ring buffer and the daemon logs it to a file and/or show to the console. 
But the message itself msut be recorded in the ring buffer.