I got that screen but blue-black color scheme with MBP 17" 2011 and OCLP 2.20 + Monterey. I thought my GPU is broken (AMD HD 6570M). I then remembered how I had huge problems with my iMac 2011 (which btw also has the HD 6570M) when upgrading OCLP from 1.5 to 2.0. Had to recover all from backups and install OS from scratch to get it back up and running, huge pain. Upgrading decision was stupid from my part as the 1.5 was already really stable and there was nothing new for Monterey anyway. So, I decided to try the OCLP 1.5 with the MBP 17" 2011 too.
Well, what do you know! It works just fine and the screen is normal.

👍
It seems like the post 2.0 OCLP-versions broke something for the older gear. And again, do not upgrade if the system works already!
Look familiar?

I see you ran Linux but anyways...could be driver/sw related...or not.