I think it is this bug https://dev.haiku-os.org/ticket/8939 so it looks like it’s closed.
You’d know if you had the problem because the mouse was unusable. I also recall that at the time ethernet didn’t work properly and audio as well, but that was not particularly unusual at the time.
EDIT I just found a post I wrote back in 2012 describing the install on the macbook 1,1 back then. Looks like haiku has come a long way! Interestingly I don’t mention the mouse issue, I guess I forgot to put that in, but do mention that I am using an external mouse. Macbook 1,1
I will try and give it a try again at some point but the machine is in storage at present waiting for me to find room after a house move.