MBP 15 inch 2011 - "halfway GPU acceleration" under OCLP

[rm5]

So, awhile ago, I got this 15-inch 2011 MacBook Pro with a 2.2 GHz i7, 8 GB of RAM, and the Radeon HD 6750M, and it's been working fine (the GPU isn't failing or anything). It worked great under High Sierra, but I just installed Big Sur with OCLP, and I'm having quite a strange issue—there seems to be what can be best described as "halfway GPU acceleration" - look at the pictures to see what I'm talking about, it's so weird! Animations are real stuttery, but transparency seems to sort of work.

Since this is the first 15 inch 2011 MBP I've owned, I'm not sure what could be causing the issue. The 6750M hasn't failed yet, but maybe it's starting to?

Also, I sincerely apologize for the headache-inducing pixelation of the images...

 

[ptrzoo]

Hi,
I'd like to follow your thread because I'm struggling on the same issue hier I guess.
I own a Macbook Pro8,2 2011 with ssd and RAM upgrade and I've installed first Big Sur and Monterey but it gets the same problems: the animation and grafics seems to be kind of slow and I have no access to the camera nor microphone. Also all the native Apps are slow, for instance Mail.
I've been looking at Mr.Macintosch and Jessie's Flying on YouTube and all over the internet but no solution founded this far.
It's weird, on my iMac12,2 2011 with also ssd and max RAM upgrade, everything went smoth and Monterey works just fine.
I'm starting to think, could be the that both partitons are on the same ssd and it gets some kinds of conflicts from them?
On my iMac I've got 2 ssd, one with El Capitan in it and the other with Monterey.
It's driving me kind of crazy, I hope to find a solution soon