On my system it varies. Sometimes it changes properly during climb as it should, levelling around FL340, 350, etc and the cabin altitude will be at around 6,000 feet or so give or take. But randomly it will only climb to about 300-500 feet. changing into manual mode makes no changes, the only thing I can do is open the outflow valves all the way or anywhere in between and the pressure never changes. Glad to see I am not the only one. It does not affect the flight per se, but it's just annoying to know that the pressure inside the airplane should be enough to start blowing out windows and seams. I'm curious as to why it happens.