I have a 2010 13inch MacBook Pro currently running Debian 9 with no real noticeable or detrimental issues.
That said, after getting past the Mac startup tone, I see the following errors:
[ 12.283961] nouveau 0000:04:00.0: bus: MMIO write of 0000B07f FAULT at 100c18 [ 12.367005] nouveau 0000:04:00.0: bus: MMIO write of 0000B07e FAULT at 100c1c
Sometimes there are more than two lines, but generally it only hangs on them for a couple of seconds before showing all the normal [ OK ] lines.
I understand that nouveau is something about the NVidia drivers for MBPs but I can't seem to find anything on SE about errors like mine. Everything I read seems to mention crashes, but I watch videos all the time without any crashes or issues whatsoever.
I'm just looking to resolve whatever issues are causing these errors. I honestly cannot recall if I ever installed any Nvidia drivers on this laptop or not, it's been a while.