On 08/20/2012 02:27 PM, Aaron Konstam uttered this comment:
On Mon, 2012-08-20 at 13:20 -0700, Rick Stevens wrote:
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
I appreciate all these tips but none make the sysrq suctions work. I'll
just give up.
Worked for me on my Dell laptop. Process:
1. Did 'echo "1" >/proc/sys/kernel/sysrq'
2. Held down left-ALT, held down PRNTSCR, pressed "h"
3. Released all three keys
4. Ran "dmesg" and saw this:
[111065.967134] SysRq : HELP : loglevel(0-9) reBoot Crash
terminate-all-tasks(E) memory-full-oom-kill(F) kill-all-tasks(I)
thaw-filesystems(J) saK show-backtrace-all-active-cpus(L)
show-memory-usage(M) nice-all-RT-tasks(N) powerOff show-registers(P)
show-all-timers(Q) unRaw Sync show-task-states(T) Unmount force-fb(V)
show-blocked-tasks(W) dump-ftrace-buffer(Z)
5. Did 'echo "0" >/proc/sys/kernel/sysrq' to disable SYSRQ.
Fully updated F17, 3.5.2-1.fc17.x86_64, XFCE and xfwm4 window manager.
----------------------------------------------------------------------
- Rick Stevens, Systems Engineer, AllDigital ricks@xxxxxxxxxxxxxx -
- AIM/Skype: therps2 ICQ: 22643734 Yahoo: origrps2 -
- -
- To err is human. To forgive, a large sum of money is needed. -
----------------------------------------------------------------------
--
users mailing list
users@xxxxxxxxxxxxxxxxxxxxxxx
To unsubscribe or change subscription options:
https://admin.fedoraproject.org/mailman/listinfo/users
Guidelines: http://fedoraproject.org/wiki/Mailing_list_guidelines
Have a question? Ask away: http://ask.fedoraproject.org
