Can't figure out the way to trigger Magic Sys Keys via keyboard debian 9 lxdm 0.53-2 xfce4.12.3

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I use a debian 9 with Magic Sys Keys enabled :



sysctl -a | grep sysrq
kernel.sysrq = 1


if I trigger in CLI, it works :



echo f > /proc/sysrq-trigger


I have something like :



emergency sync trigerred


from tty1.



But when I try to do alt+Print/Syst+s from tty1, I switch from tty1 to xorg tty7 with in xorg log :



[ 1019.608] (II) AIGLX: Suspending AIGLX clients for VT switch
[ 1044.548] (II) AIGLX: Resuming AIGLX clients after VT switch


Kernel :



$ uname -r
4.9.0-6-amd64


I use xfce4 4.12.3



No keyboard shortcut with this combo in xfce4 applications menu -> parameters -> keyboard -> keyboard shortcuts (translated from my mind French to English)



I tried with a fresh new user and it's the same problem.



I tried with no xfce4 session, just tty1 and lxdm on tty7, I still switch to lxdm tty7 if I type the keyboard shortcut



Any clue ?



EDIT 20180802



Same thing with cinnamon DM 3.2.7, if I hit alt+Print/Syst+s from tty1, I switch from tty1 to xorg tty







share|improve this question





















  • Did you forget the <kbd>ctrl</kbd> in the key sequence? However I believe the MagicSysReq key sequences don't work from X because of the way X handles the keyboard.
    – wurtel
    Jun 6 at 12:00










  • No, I don't type ctrl, just alt+sys+s (French keyboard)
    – Gilles Quenot
    Jun 6 at 12:36











  • I saw that that's only alt+sys+s that moves tty1 to tty7, alt+sys+f works, but now I can't write buffers to disk when I trigger oom-killer
    – Gilles Quenot
    Jun 13 at 9:50










  • From my Debian-unstable system, Alt+Sys+S gives an Emergency Sync message in the syslog, even if I do it from X (the kernel sees keypresses before X does). It might have something to do with your hardware. Is this a VM? Is it a standard keyboard layout, or a minimal layout with a Fn key (or better yet, can you share an image?) You mentioned it's a French keyboard; are you using (left) Alt, or (right) Alt-Gr? Does "hold Alt, press Sys, release Sys, press S, release S, release Alt" work?
    – Jander
    Aug 7 at 23:11














up vote
1
down vote

favorite












I use a debian 9 with Magic Sys Keys enabled :



sysctl -a | grep sysrq
kernel.sysrq = 1


if I trigger in CLI, it works :



echo f > /proc/sysrq-trigger


I have something like :



emergency sync trigerred


from tty1.



But when I try to do alt+Print/Syst+s from tty1, I switch from tty1 to xorg tty7 with in xorg log :



[ 1019.608] (II) AIGLX: Suspending AIGLX clients for VT switch
[ 1044.548] (II) AIGLX: Resuming AIGLX clients after VT switch


Kernel :



$ uname -r
4.9.0-6-amd64


I use xfce4 4.12.3



No keyboard shortcut with this combo in xfce4 applications menu -> parameters -> keyboard -> keyboard shortcuts (translated from my mind French to English)



I tried with a fresh new user and it's the same problem.



I tried with no xfce4 session, just tty1 and lxdm on tty7, I still switch to lxdm tty7 if I type the keyboard shortcut



Any clue ?



EDIT 20180802



Same thing with cinnamon DM 3.2.7, if I hit alt+Print/Syst+s from tty1, I switch from tty1 to xorg tty







share|improve this question





















  • Did you forget the <kbd>ctrl</kbd> in the key sequence? However I believe the MagicSysReq key sequences don't work from X because of the way X handles the keyboard.
    – wurtel
    Jun 6 at 12:00










  • No, I don't type ctrl, just alt+sys+s (French keyboard)
    – Gilles Quenot
    Jun 6 at 12:36











  • I saw that that's only alt+sys+s that moves tty1 to tty7, alt+sys+f works, but now I can't write buffers to disk when I trigger oom-killer
    – Gilles Quenot
    Jun 13 at 9:50










  • From my Debian-unstable system, Alt+Sys+S gives an Emergency Sync message in the syslog, even if I do it from X (the kernel sees keypresses before X does). It might have something to do with your hardware. Is this a VM? Is it a standard keyboard layout, or a minimal layout with a Fn key (or better yet, can you share an image?) You mentioned it's a French keyboard; are you using (left) Alt, or (right) Alt-Gr? Does "hold Alt, press Sys, release Sys, press S, release S, release Alt" work?
    – Jander
    Aug 7 at 23:11












up vote
1
down vote

favorite









up vote
1
down vote

favorite











I use a debian 9 with Magic Sys Keys enabled :



sysctl -a | grep sysrq
kernel.sysrq = 1


if I trigger in CLI, it works :



echo f > /proc/sysrq-trigger


I have something like :



emergency sync trigerred


from tty1.



But when I try to do alt+Print/Syst+s from tty1, I switch from tty1 to xorg tty7 with in xorg log :



[ 1019.608] (II) AIGLX: Suspending AIGLX clients for VT switch
[ 1044.548] (II) AIGLX: Resuming AIGLX clients after VT switch


Kernel :



$ uname -r
4.9.0-6-amd64


I use xfce4 4.12.3



No keyboard shortcut with this combo in xfce4 applications menu -> parameters -> keyboard -> keyboard shortcuts (translated from my mind French to English)



I tried with a fresh new user and it's the same problem.



I tried with no xfce4 session, just tty1 and lxdm on tty7, I still switch to lxdm tty7 if I type the keyboard shortcut



Any clue ?



EDIT 20180802



Same thing with cinnamon DM 3.2.7, if I hit alt+Print/Syst+s from tty1, I switch from tty1 to xorg tty







share|improve this question













I use a debian 9 with Magic Sys Keys enabled :



sysctl -a | grep sysrq
kernel.sysrq = 1


if I trigger in CLI, it works :



echo f > /proc/sysrq-trigger


I have something like :



emergency sync trigerred


from tty1.



But when I try to do alt+Print/Syst+s from tty1, I switch from tty1 to xorg tty7 with in xorg log :



[ 1019.608] (II) AIGLX: Suspending AIGLX clients for VT switch
[ 1044.548] (II) AIGLX: Resuming AIGLX clients after VT switch


Kernel :



$ uname -r
4.9.0-6-amd64


I use xfce4 4.12.3



No keyboard shortcut with this combo in xfce4 applications menu -> parameters -> keyboard -> keyboard shortcuts (translated from my mind French to English)



I tried with a fresh new user and it's the same problem.



I tried with no xfce4 session, just tty1 and lxdm on tty7, I still switch to lxdm tty7 if I type the keyboard shortcut



Any clue ?



EDIT 20180802



Same thing with cinnamon DM 3.2.7, if I hit alt+Print/Syst+s from tty1, I switch from tty1 to xorg tty









share|improve this question












share|improve this question




share|improve this question








edited Aug 2 at 15:38
























asked Jun 6 at 11:25









Gilles Quenot

15.2k13448




15.2k13448











  • Did you forget the <kbd>ctrl</kbd> in the key sequence? However I believe the MagicSysReq key sequences don't work from X because of the way X handles the keyboard.
    – wurtel
    Jun 6 at 12:00










  • No, I don't type ctrl, just alt+sys+s (French keyboard)
    – Gilles Quenot
    Jun 6 at 12:36











  • I saw that that's only alt+sys+s that moves tty1 to tty7, alt+sys+f works, but now I can't write buffers to disk when I trigger oom-killer
    – Gilles Quenot
    Jun 13 at 9:50










  • From my Debian-unstable system, Alt+Sys+S gives an Emergency Sync message in the syslog, even if I do it from X (the kernel sees keypresses before X does). It might have something to do with your hardware. Is this a VM? Is it a standard keyboard layout, or a minimal layout with a Fn key (or better yet, can you share an image?) You mentioned it's a French keyboard; are you using (left) Alt, or (right) Alt-Gr? Does "hold Alt, press Sys, release Sys, press S, release S, release Alt" work?
    – Jander
    Aug 7 at 23:11
















  • Did you forget the <kbd>ctrl</kbd> in the key sequence? However I believe the MagicSysReq key sequences don't work from X because of the way X handles the keyboard.
    – wurtel
    Jun 6 at 12:00










  • No, I don't type ctrl, just alt+sys+s (French keyboard)
    – Gilles Quenot
    Jun 6 at 12:36











  • I saw that that's only alt+sys+s that moves tty1 to tty7, alt+sys+f works, but now I can't write buffers to disk when I trigger oom-killer
    – Gilles Quenot
    Jun 13 at 9:50










  • From my Debian-unstable system, Alt+Sys+S gives an Emergency Sync message in the syslog, even if I do it from X (the kernel sees keypresses before X does). It might have something to do with your hardware. Is this a VM? Is it a standard keyboard layout, or a minimal layout with a Fn key (or better yet, can you share an image?) You mentioned it's a French keyboard; are you using (left) Alt, or (right) Alt-Gr? Does "hold Alt, press Sys, release Sys, press S, release S, release Alt" work?
    – Jander
    Aug 7 at 23:11















Did you forget the <kbd>ctrl</kbd> in the key sequence? However I believe the MagicSysReq key sequences don't work from X because of the way X handles the keyboard.
– wurtel
Jun 6 at 12:00




Did you forget the <kbd>ctrl</kbd> in the key sequence? However I believe the MagicSysReq key sequences don't work from X because of the way X handles the keyboard.
– wurtel
Jun 6 at 12:00












No, I don't type ctrl, just alt+sys+s (French keyboard)
– Gilles Quenot
Jun 6 at 12:36





No, I don't type ctrl, just alt+sys+s (French keyboard)
– Gilles Quenot
Jun 6 at 12:36













I saw that that's only alt+sys+s that moves tty1 to tty7, alt+sys+f works, but now I can't write buffers to disk when I trigger oom-killer
– Gilles Quenot
Jun 13 at 9:50




I saw that that's only alt+sys+s that moves tty1 to tty7, alt+sys+f works, but now I can't write buffers to disk when I trigger oom-killer
– Gilles Quenot
Jun 13 at 9:50












From my Debian-unstable system, Alt+Sys+S gives an Emergency Sync message in the syslog, even if I do it from X (the kernel sees keypresses before X does). It might have something to do with your hardware. Is this a VM? Is it a standard keyboard layout, or a minimal layout with a Fn key (or better yet, can you share an image?) You mentioned it's a French keyboard; are you using (left) Alt, or (right) Alt-Gr? Does "hold Alt, press Sys, release Sys, press S, release S, release Alt" work?
– Jander
Aug 7 at 23:11




From my Debian-unstable system, Alt+Sys+S gives an Emergency Sync message in the syslog, even if I do it from X (the kernel sees keypresses before X does). It might have something to do with your hardware. Is this a VM? Is it a standard keyboard layout, or a minimal layout with a Fn key (or better yet, can you share an image?) You mentioned it's a French keyboard; are you using (left) Alt, or (right) Alt-Gr? Does "hold Alt, press Sys, release Sys, press S, release S, release Alt" work?
– Jander
Aug 7 at 23:11















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