iMac 14,3 (late 2009) - BigSur works amazing, but intermittent Graphics issues

iMac 14,3 (late 2009) - BigSur works amazing, but intermittent Graphics issues

I am running OCLP on a late 2009 iMac (14,3).

It works amazing, but my display shows a white page, if I change any setting the video scrambles. Also if I use Splashtop to remote in it gets into a scrambled state it seems... this morning it was also scrambled, I did have Night Shift on, so I think since it changes the colour profile that may be why.

I have to reboot the iMac once the video scrambles.
Does anyone know what is going on, or how to fix it?

Beyond that it works flawlessly!

https://preview.redd.it/69krj755jgsc1.png?width=668&format=png&auto=webp&s=189beec45bdcf7ac27dc481bff2478b48416b553

submitted by /u/codemusicred
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