Keyboard sdk doesn't forward super, uhid doesn't work at all

[Pecacheu]

Environment

• OS: Windows 11
• Scrcpy version: v3.1
• Installation method: Binary release
• Device model: Galaxy S24U
• Android version: 14

Describe the bug

Hi, I'm trying to run DeX through scrcpy, and I mostly have it working, but I'm having keyboard-related issues. Under the default settings, keyboard input works fine, except for two problems: Firstly, the super/windows key isn't forwarded (this is annoying because this key is used by DeX), and secondly, the on-screen-keyboard won't go away because my phone is NOT detecting a physical keyboard present despite my typing.

I read the Keyboard guide and decided to try uhid mode with --keyboard=uhid and/or the -K option... When I enable this, a physical keyboard is detected by DeX and my second problem of the above is solved, OSK disappears. But now no matter which key I press, nothing happens. No input is forwarded at all!

[rom1v]

Firstly, the super/windows key isn't forwarded

Because by default it is captured for scrcpy shortcuts. It can be changed: https://github.com/Genymobile/scrcpy/blob/master/doc/shortcuts.md

But now no matter which key I press, nothing happens. No input is forwarded at all!

Does it work with "normal" screen mirroring (not DeX)?

Does UHID mouse work?

Does AOA keyboard/mouse work?

Check adb logcat for any errors, and add -Vverbose to scrcpy to check that the inputs are correctly injected.

[Pecacheu]

Thanks for the help!

After testing with a normal screen mirror (no extra options to scrcpy besides -K), it worked... UHID mouse mode works too. Then when I went back to my usual options, UHID works in DeX too... That's super weird, even today it wasn't working until then. Maybe the normal screen mirror without display-id option somehow triggered UHID into life? As for AOA, it seems to work too but I can't screen mirror while using it, so it wouldn't be very useful to me.

Additionally adding --shortcut-mod=rctrl or similar seems to forward the Super key! I didn't know about that keybinding. It seems that Windows still also processes the keypress so every time you press the key it opens the Start menu, which is a bit annoying, but it still gets forwarded if the scrcpy window is in focus.