MATRIX_KB in 2.8.0

Do you have the matrix_kb addf between read and write?

Jep, rearranged the HAL a little bit for better readability .

Hmm I just tried 2.8 and don't see a problem either
Do all the keys work?
(4x8 mode scanner columns are P1 pins 7,8,9,10)

Yes, all keys are wirking fine. Key r1c1 works too, but it starts in pressed state.
If I use 2.7.14 key r1c1 starts in inactive state like all the others do. Because of that i thought it is an issue in 2.8.

Very odd
Can you do a little experiment?

leave the matrix_kb keycode pin unconnected until linuxcnc starts
and then enter the net command by hand, to see if the same issue
that is, comment out the connection in your hal file

#net keypad hm2_7i76e.0.7i73.0.2.keycode => matrix_kb.0.keycode

and then connect by hand when linuxcnc is running

halcmd net keypad hm2_7i76e.0.7i73.0.2.keycode => matrix_kb.0.keycode

(trying to see if there is an initial keycode problem of some kind)

Ok, I did that:

when net keypad was unconnected it stated in the correct state (all keys inactive). Then I connected it via halcmd and it was inactive and worked as it should.

I moved the line to the postgui.hal. Now it is working.

But i think this is a quick and dirty work around and the bug is still not found.