It is hard to know where to start with the problems with the use of the
SysReg key.. Since acording to the Wikipedia notes in order to get these
Magic SysReg features to work you have tp add the Ctrl button. So to
reboot you would have to use the Ctrl+Alt+SysReg+ b button. On my
workstation Keyboard this is nearly impossible to do because of the
position of the SysReg key in the upper right corner of the keyboard.
On my laptop where I can hit the keys the function fails to work.
Without the Ctrl all you get is screen shots which I do get.

With the alternate approach of:
echo key > /proc/sysreq-trigger the reboot works but I can't detect
anything else working.

So how does one use these magic keys ?
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On 20 August 2012 23:55, Aaron Konstam <akonstam@sbcglobal.net> wrote:
> It is hard to know where to start with the problems with the use of the
<--SNIP-->
>
> So how does one use these magic keys ?
> --

Could you please post the link to the wikipedia?
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On 08/20/2012 12:55 PM, Aaron Konstam wrote:

It is hard to know where to start with the problems with the use of the
SysReg key.. Since acording to the Wikipedia notes in order to get these
Magic SysReg features to work you have tp add the Ctrl button. So to
reboot you would have to use the Ctrl+Alt+SysReg+ b button. On my
workstation Keyboard this is nearly impossible to do because of the
position of the SysReg key in the upper right corner of the keyboard.
On my laptop where I can hit the keys the function fails to work.
Without the Ctrl all you get is screen shots which I do get.

With the alternate approach of:
echo key > /proc/sysreq-trigger the reboot works but I can't detect
anything else working.

So how does one use these magic keys ?



I can't speak for anybody else, but when I've experimented with it, I
used both hands.

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On 08/20/2012 12:55 PM, Aaron Konstam wrote:

It is hard to know where to start with the problems with the use of the
SysReg key.. Since acording to the Wikipedia notes in order to get these
Magic SysReg features to work you have tp add the Ctrl button. So to
reboot you would have to use the Ctrl+Alt+SysReg+ b button. On my
workstation Keyboard this is nearly impossible to do because of the
position of the SysReg key in the upper right corner of the keyboard.
On my laptop where I can hit the keys the function fails to work.
Without the Ctrl all you get is screen shots which I do get.

With the alternate approach of:
echo key > /proc/sysreq-trigger the reboot works but I can't detect
anything else working.

So how does one use these magic keys ?


You have to enable the sysrq key in /etc/sysctl.conf:
kernel.sysrq = 1

In non-graphical mode it's just Alt+SysRq (not Ctrl, and not Alt+Ctrl),
but the GUI can choose to ignore the combination - there used to be some
X keyboard setting you could set globally, but it doesn't work anymore.
I think there's some workaround for gnome, but I never did figure out
how to make it work right in XFCE.


Lastly, on the laptop the SysRq key might only be usable with Fn
modifier (Ctrl+Alt+Fn+SysRq+...), though Alt+PrintScreen has worked for
me on all laptops I've tried (in text mode)



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On Tue, 2012-08-21 at 00:00 +0400, Hiisi wrote:
> On 20 August 2012 23:55, Aaron Konstam <akonstam@sbcglobal.net> wrote:
> > It is hard to know where to start with the problems with the use of the
> <--SNIP-->
> >
> > So how does one use these magic keys ?
> > --
>
> Could you please post the link to the wikipedia?
> --
> Hiisi.
> Registered Linux User #487982. Be counted at: http://counter.li.org/
> --
> Spandex is a privilege, not a right.

link Is:
http://en.wikipedia.org/wiki/Magic_SysRq_key

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On 08/20/2012 01:05 PM, Joe Zeff uttered this comment:

On 08/20/2012 12:55 PM, Aaron Konstam wrote:

It is hard to know where to start with the problems with the use of the
SysReg key.. Since acording to the Wikipedia notes in order to get these
Magic SysReg features to work you have tp add the Ctrl button. So to
reboot you would have to use the Ctrl+Alt+SysReg+ b button. On my
workstation Keyboard this is nearly impossible to do because of the
position of the SysReg key in the upper right corner of the keyboard.
On my laptop where I can hit the keys the function fails to work.
Without the Ctrl all you get is screen shots which I do get.

With the alternate approach of:
echo key > /proc/sysreq-trigger the reboot works but I can't detect
anything else working.

So how does one use these magic keys ?



I can't speak for anybody else, but when I've experimented with it, I
used both hands.


It's supposed to be a simultaneous press of ALT, SYSRQ (or PRINTSCREEN)
and the command key (B in your case). Note it only works if
/proc/sys/kernel/sysrq contains a non-zero value. To enable ALL
functionality, first set /proc/sys/kernel/sysrq to the value "1":

echo "1" >/proc/sys/kernel/sysrq

Then hit your key combo. Some keyboards may have issues with so many
simultaneous keypresses. In those cases hold down ALT, then press and
release SYSRQ, then press and release your command key and finally
release ALT.

It's been a while since I futzed with it. If you have the kernel-doc
RPM installed, it's explained in

/usr/share/doc/kernel-doc-(version)/Documentation/sysrq.txt

Your mileage may vary. Batteries not included. Void where prohibited.
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On Mon, 2012-08-20 at 13:05 -0700, Joe Zeff wrote:
> On 08/20/2012 12:55 PM, Aaron Konstam wrote:
> > It is hard to know where to start with the problems with the use of the
> > SysReg key.. Since acording to the Wikipedia notes in order to get these
> > Magic SysReg features to work you have tp add the Ctrl button. So to
> > reboot you would have to use the Ctrl+Alt+SysReg+ b button. On my
> > workstation Keyboard this is nearly impossible to do because of the
> > position of the SysReg key in the upper right corner of the keyboard.
> > On my laptop where I can hit the keys the function fails to work.
> > Without the Ctrl all you get is screen shots which I do get.
> >
> > With the alternate approach of:
> > echo key > /proc/sysreq-trigger the reboot works but I can't detect
> > anything else working.
> >
> > So how does one use these magic keys ?
> >
>
> I can't speak for anybody else, but when I've experimented with it, I
> used both hands.

Ok, it can be reached when you use both hands but it still does not work
for me. Does it matter which Ctrl key you use?

Just to be clear, in /etc/sysctl.conf I changed: kernel.sysrq to 1 from
0.
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On 08/20/2012 01:12 PM, Konstantin Svist wrote:

In non-graphical mode it's just Alt+SysRq (not Ctrl, and not Alt+Ctrl),
but the GUI can choose to ignore the combination - there used to be some
X keyboard setting you could set globally, but it doesn't work anymore.
I think there's some workaround for gnome, but I never did figure out
how to make it work right in XFCE.


I've found on my desktop that if I'm at an alternate terminal, without
the GUI being active, I can usually get it to work if I use the right
Alt key, but not the left; if start with the Control key, however, it
works just fine with either Alt key. So far, I've not tried it on my
laptop.

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On 08/20/2012 01:24 PM, Aaron Konstam uttered this comment:

On Mon, 2012-08-20 at 13:05 -0700, Joe Zeff wrote:

On 08/20/2012 12:55 PM, Aaron Konstam wrote:

It is hard to know where to start with the problems with the use of the
SysReg key.. Since acording to the Wikipedia notes in order to get these
Magic SysReg features to work you have tp add the Ctrl button. So to
reboot you would have to use the Ctrl+Alt+SysReg+ b button. On my
workstation Keyboard this is nearly impossible to do because of the
position of the SysReg key in the upper right corner of the keyboard.
On my laptop where I can hit the keys the function fails to work.
Without the Ctrl all you get is screen shots which I do get.

With the alternate approach of:
echo key > /proc/sysreq-trigger the reboot works but I can't detect
anything else working.

So how does one use these magic keys ?



I can't speak for anybody else, but when I've experimented with it, I
used both hands.


Ok, it can be reached when you use both hands but it still does not work
for me. Does it matter which Ctrl key you use?


It shouldn't, but it's not "CTRL", it's "ALT". ALT-SYSRQ-commandkey


Just to be clear, in /etc/sysctl.conf I changed: kernel.sysrq to 1 from
0.


Did you "sysctl -p" or reboot after doing that?
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On 20 August 2012 21:24, Aaron Konstam <akonstam@sbcglobal.net> wrote:
>> I can't speak for anybody else, but when I've experimented with it, I
>> used both hands.
> Ok, it can be reached when you use both hands but it still does not work
> for me. Does it matter which Ctrl key you use?
Offtopic: Almost 20 years ago one of my friends used to teach
computing to 10 year olds (DOS days). When he was trying to teach how
to do CTRL-ALT-DEL, he fell off laughing when one of his students held
CTRL using one finger on one hand, ALT using an other finger on the
other hand and then hit the ALT using his nose...

Try that method in doubt.

(Hint, if it's a laptop, you might have to use the so-called function key)

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