I am still Having this issue TBM V1.1.9 X-plane Version 11.34r1. I have had a couple flights the Auto setting maintained cabin temperature, but most i have to flip it to manual to cool the cabin. Looking at the ECS diagram I have noticed that in auto, The vapor cycle system is not running but when placed in manual it turns on and RPM and CHG are at ~80%.
Auto AC Cabin temp increases Compressor does not turn on.
AC in manual Compressor turns on Cabin temp decreases.