send SysRq key to linux guest (fixed in 4.3)

[Leo]

Sending the SysRq key from host to guest doesn't work. (Tested on a windows and on a linux host with three different linux guests.)

---

send CTRL + ALT + SysRq + s

Host:

$ VBoxManage controlvm CD-Boot keyboardputscancode 1d 38 54 1f 9f d4 b8 9d

Guest:

# showkey
kb mode was UNICODE
[ if you are trying this under X, it might not work
since the X server is also reading /dev/console ]

press any key (program terminates 10s after last keypress)...
keycode  28 release
keycode  29 press
keycode  56 press
keycode  31 press
keycode  31 release
keycode  56 release
keycode  29 release

(The SysRq key (scancode 0x54 = 84 dec) is missing.)

---

send just SysRq (press and release)

Host:

$ VBoxManage controlvm CD-Boot keyboardputscancode 54 9d

Guest:

# showkey
kb mode was UNICODE
[ if you are trying this under X, it might not work
since the X server is also reading /dev/console ]

press any key (program terminates 10s after last keypress)...
keycode  28 release

---

sending ALT (dec 56) + SysRq in the VBox console window

Guest:

# showkey
kb mode was UNICODE
[ if you are trying this under X, it might not work
since the X server is also reading /dev/console ]

press any key (program terminates 10s after last keypress)...
keycode  28 release
keycode  56 press
keycode  56 release
keycode  56 press
keycode  99 press
keycode  99 release
keycode  56 release

[michaln]

Please check if this still occurs with the current VirtualBox 4.3 release.

You also probably realize that the second example is bogus, perhaps you meant '54 d4' instead of '54 9d'?

[Leo]

At least example 1 (CTRL + ALT + SysRq + s) works now with VirtualBox 4.3.12. Thanks!

[michaln]

OK, let's close this then... if there are remaining problems with the SysRq key, this ticket can of course be re-opened with detailed description of what's wrong.