I have now tried the fork with new mixer configuration posibilities: [WIP] Mixer configuration - View, modify mixer parameters then save to a .mix - With px4io and mavlink support by crashmatt · Pull Request #6357 · PX4/PX4-Autopilot · GitHub
I experience the same problem there, it do however seem like all mixers are set up. The command mixer config /dev/pwm_output0 gives:
M: 3
O: 10000 10000 0 -10000 10000
S: 0 0 -5999 -5999 0 -10000 10000
S: 0 1 5999 5999 0 -10000 10000
S: 0 5 3999 3999 0 -10000 10000
M: 3
O: 10000 10000 0 -10000 10000
S: 0 0 -5999 -5999 0 -10000 10000
S: 0 1 -5999 -5999 0 -10000 10000
S: 0 5 -3999 -3999 0 -10000 10000
M: 3
O: 10000 10000 0 -10000 10000
S: 0 0 5999 5999 0 -10000 10000
S: 0 1 5999 5999 0 -10000 10000
S: 0 5 -3999 -3999 0 -10000 10000
M: 3
O: 10000 10000 0 -10000 10000
S: 0 0 5999 5999 0 -10000 10000
S: 0 1 -5999 -5999 0 -10000 10000
S: 0 5 3999 3999 0 -10000 10000
M: 2
O: 10000 10000 0 -10000 10000
S: 0 2 9000 9000 0 -10000 10000
S: 0 3 5000 5000 0 -10000 10000
M: 2
O: 10000 10000 0 -10000 10000
S: 0 2 9000 9000 0 -10000 10000
S: 0 3 -5000 -5000 0 -10000 10000
the four working mixers have their scalers changed by 1, relative to the input mixers…