Using Mesa Stepgen as spindle but M4 / reverse / ccw does nothing

And are you using M4 S1000 (or whatever) rather than just a plain M4?

like Andy mentioned, what's in your ini file for reverse speeds

linuxcnc.org/docs/2.9/html/config/ini-co...:ini:sec:spindle-num

I've just recently run into the same thing and have a thread going here -
forum.linuxcnc.org/49-basic-configuratio...t-no-reverse?start=0

No answers yet, but PCW said he thinks it's something to do with the halui because he's not having M4 problems on a setup that doesn't have halui.

Have you made any progress?

The docs state that if MAX_REVERSE_VELOCITY and MIN_REVERSE_VELOCITY aren't defined they will default to MAX_VELOCITY and MIN_VELOCITY respectively. This doesn't appear to be true, because after I defined those _REVERSE_ values my M4 came to life. The spindle is still turning the wrong direction, but at least it's responding!

Thanks!

Aha, that makes sense. Thanks for checking in. I downgraded to 2.8 because I was desperate to get a job finished. Same config, more or less, and it works.