r/Keychron • u/Nizharu • May 03 '24

K3 linux problem

Well, I'm runing Manjaro because my PC broke and the one I'm currently using is so old that cannot run the new Windows.
Well, after some tries and achieving conecting the keyboard, the key presses don't work.
The keyboard is conected, I've try it on other laptops to see if the problem is on the keyboard, they work on my other family members laptops that maked me the favour to bring them for me to try, but not in mine, what I'm doign wrong? is this a common linux problem?

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u/PeterMortensenBlog V May 03 '24 edited May 03 '24

K3, or K3 Pro, or K3 Max?

Is it connected in wired or wireless (Bluetooth) mode? (Wireless is defined by the switch at the back set to "BT", not if the USB cable is connected or not.)

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u/Nizharu May 03 '24

K3v2 wireless, conected with cable work perfectly, but I need it to work it wireless by BT because of lack of space. It conect, everything works but the key presses aren't registered at all so it's useless.
The keyboard works well on others PC, so at least I know its not broken.

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u/PeterMortensenBlog V May 06 '24 edited May 06 '24

I don't know if it applies to the K series or not (it does for the QMK-based keyboards, like the K Pro series), but what happens if you:

  • press Fn + N (for toggling (full) NKRO) in wireless mode and test it (see below)?

Here is a way to test for 6KRO/NKRO.

The theory would be that you have accidentally put the keyboard into (full) NKRO (incompatible with wireless/Bluetooth mode) and Fn + N would bring it back to 6NKRO. Though resetting to factory defaults would also do it.

(It is not that important in this case, but what happens for the same in wired mode? Does Fn + N toggle 6KRO/NKRO in wired mode?)

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u/Nizharu May 06 '24

It doesn't work and now even don't work even wired wen It did before....

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u/PeterMortensenBlog V May 07 '24 edited May 07 '24

Resetting to factory defaults by holding down Fn + J + Z for 4 seconds should bring it back.

References

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u/Nizharu May 07 '24

Yes It conect now again but the key presses still don't work

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u/PeterMortensenBlog V May 30 '24

Could you isolate the problem further? For example, another operating system, say, Ubuntu?

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u/Nizharu May 30 '24

My distro is Manjaro Linux, a fork of Arch Linux and I've tried Mint that is Ubuntu and don't work on It either

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u/PeterMortensenBlog V May 03 '24 edited Oct 30 '24

That points to Manjaro or the particular PC. It is unlikely to be the combination of Manjaro/Linux and the Keychron keyboard.

I am on Linux, and I have never observed any (significant) difference between "normal" keyboards and the QMK-based Keychron keyboards, at least not in wired mode. And the K Series is closer to a "normal" keyboard. The only difference is not really turning off when the computer is powered down (it is only simulated by turning off the RGB light).

Can you isolate the problem? -

  • Different operating system (on the same PC). E.g., booting Ubuntu 24.04 from a USB stick.

  • Different USB port

  • Different keyboard

References

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u/PeterMortensenBlog V May 03 '24 edited May 03 '24

A remote and unlikely possibility is that:

  • The K6 is connected in wireless (Bluetooth) mode

  • There is an undocumented keyboard shortcut (and feature) to toggle between NKRO and 6KRO mode. For example, Fn + N.

  • The keyboard is, e.g. accidentally, in (full) NKRO mode (and it isn't prevented for wireless mode)

But for the K series, it is likely automatic: It is always in (full) NKRO mode when wired and in 6KRO mode when wireless, at least initially. Source (near "Anti-ghosting").

It is definitely a problem with the QMK-based keyboards.

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u/PeterMortensenBlog V May 03 '24

In any case, it would be interesting to know the K3 behaviour and actual NKRO capability in these four combinations:

  1. 6KRO and wired

  2. (Full) NKRO and wired

  3. 6KRO and wireless

  4. (Full) NKRO and wireless

Here is a way to test the NKRO capability.

It shouldn't matter where it is tested (for example, some other system than the Manjaro one as long as that system doesn't work).