Virtual keyboard is missing SysRq/PrintScreen

[mircea-vutcovici]

Sometimes when Linux is frozen you can use SysRq to do some troubleshooting or reboot the machine.
The virtual keyboard of JetKVM is missing the SysRq/PrintScreen key.
See also: https://en.wikipedia.org/wiki/Magic_SysRq_key and https://docs.kernel.org/admin-guide/sysrq.html

[freman]

While we're at it can I please request a scroll lock key?

[grimwiz]

I may want to use Scroll Lock to drive a KVM, so that I can use one JetKVM to access multiple consoles. I'm also keen to have an "insert" key (to toggle between insert and overwrite in a word processor) and the SysRq/PrintScreen keys mentioned above.

[phewitt-uw]

As above, I am currently using my JetKVM on a generic KVM switch that uses the scroll-lock key to change kvm ports.

For example

scl-lock + scl-lock + 1 = port 1
scl-lock + scl-lock + 2 = port 2
scl-lock + scl-lock + 3 = port 3

If would be great to have either the button on the virtual keyboard, or the ability to create custom keypress macros much like the "ctrl-alt-delete" button you already have in place.

Lastly, scroll-lock button itself does not seem to be mapped, and doesnt pass through when pushed on a physical keyboard.

[spawnflagger]

I also tested with a 4-port KVM Switch that supports keyboard hotkeys, and has option to change hotkey from Scroll_Lock (default) to Num_Lock, Caps_Lock, or Ctrl+Shift. Caps_Lock on the on-screen keyboard or the client machine does not get passed through as a key stroke, so that might be useful as a Macro-button as well. (I couldn't test Num_Lock from my laptop, but I suspect that won't get passed through either)
Ctrl+Shift+{1,2,3,4} does work through the JetKVM though, so that's what I have it set on now.

Edit: I don't recommend this switch with JetKVM - it loses USB connection to the host when switching sometimes, and doesn't come back until rebooting everything.

But there may be other better-behaved KVM switches that use hot-keys other than Scroll_Lock.

[phewitt-uw]

Just an update:

I did some keyjamming this morning and have found that my generic aimos 4 port KVM responds to another undocumented key press combo.

Ctrl + Ctrl + 1 = port 1
Ctrl + Ctrl + 2 = port 2
Etc...

This combo works well with jetkvm as long as you're connected to the keyboard usb port on the KVM (does mean you lose usb storage passthrough support though if that's important to you)

Sharing in case this is useful to fellow jetkvm users

[patrickhanft]

I am looking for a feature to combine a generic key together with Ctrl in the on-screen keyboard. My (somewhat weird) device needs [Ctrl]+[F2] to enter BIOS setup. That doesn't seem to be possible right now with JetKVM.

[mircea-vutcovici]

I am looking for a feature to combine a generic key together with Ctrl in the on-screen keyboard. My (somewhat weird) device needs [Ctrl]+[F2] to enter BIOS setup. That doesn't seem to be possible right now with JetKVM.

You should be able to do this by pressing CTRL on JetKVM virtual keyboard and F2 on physical keyboard, on the machine where you have the browser.

[jtbrough]

Another user seeking to have Scroll Lock added. Even better would be support for definable/namable keyboard combinations in addition to the in-built Ctrl + Alt + Del and Alt + Meta + Escape.

These would be useful across a variety of scenarios, but in specific: toggling an 8-port HDMI KVM Switch via hotkey.

[IDisposable]

Print Screen/System Request, Scroll Lock, Pause/Break as well as Ctrl+Alt+Backspace combo key were added in #449

@patrickhanft: I am looking for a feature to combine a generic key together with Ctrl in the on-screen keyboard. My (somewhat weird) device needs [Ctrl]+[F2] to enter BIOS setup. That doesn't seem to be possible right now with JetKVM.

I'm currently working on support in the Virtual Keyboard to handle "Ctrl" and "Alt" presses as toggles (as the shift key does now). I will update here when complete.

@spawnflagger: I don't recommend this switch with JetKVM - it loses USB connection to the host when switching sometimes, and doesn't come back until rebooting everything.

Are you providing power to the JetKVM through the USB-C Y-cable (such that it gets power from a USB wall-wart) so that the physical KVM doesn't reboot it?

[IDisposable]

PR #500 will fix most of the Virtual Keyboard issues too...