I'm trying to set up a single-axis servo gimbal, using PX4 1.6.5 on a CUAV Pixhack 2.83 on a quadrotor.
I can control the servo using RC passthrough if I plug it into output 6 and map a radio channel to AUX1 (and press the safety button).
If I plug the servo into output 8, set MNT_MODE_IN=RC, reboot, and set MNT_MAN_PITCH=AUX1, I can control the servo using RC passthrough but it does not respond to attitude changes. At the console, if I run "vmount stop" and then "vmount start" it outputs a steady stream of "ERROR [uorb] mount_orientation advertise failed".
Am I doing something wrong?