You need the GVA patch for the older 9400m and 320m based MacBooks / MacBook Pros. DVDplayback works through 3rd party apps, but not the built in Apple DVD player unless you replace the Framework. There is a link in this post to download a script, you will need to adjust the script if using it on Catalina or Monterey since it was written to work on Mojave.Does Open Core support the optical drive? Dosdudes patcher killed support for the optical drive for DVD Player in the MacBooks I tried it on.
macOS 10.14 Mojave on Unsupported Macs Thread
I have a MacBook6,1, with SSD and 8Gb RAM, and I successfully updated it from High Sierra to 10.14.3 thanks to the dosdude patcher. Thank you very much. Everything works as well as on High Sierra. The problem of artifacts of the light theme was safely solved by the transutil script. Macbook 6.1...