I'm reviving this thread for the purpose of consolidating issues with this derailleur. Today at the bike shop we had quite a time with a brand new bike and this derailleur with Alivio 9-speed shift triggers. I could adjust it to shift up, but not down. Or I could adjust it to shift down but not up. We tried three different 9-speed Shadow mechs (another M592 and an older SLX) and replaced the cable and housing, checked the wheel hub, freewheel, cassette, derailleur hanger, frame alignment, cable routing, chain type, limits, B-tension, indexing, absolutely everything and could not get it better than 80% accuracy.

I had the same experience with our school's fleet of rental bikes. All eight of them had SLX 9-speed Shadow mechs and Alivio triggers. I did cable and housing and the whole shift-tuning shabang on every single one and they all behaved inconsistent in an identical manner.

Also sold a brand new bike last year with the new Alivio Shadow in 9-speed and it had the exact issue. Inconsistent.

With all of these, it was never bad enough to make it nonfunctional, but bad enough to where a customer would notice and it was never satisfying in the workstand.

And yes, the cables were routed on the proper side of the clamp.