Hai Karate

Most of my EFI folder is taken from the Takiller post linked below with some changes to support my Intel WiFi and the Alps trackpad and built-in keyboard. My OC config was originally injecting 0x0a260006 as it does in the original Takiller one but I read somewhere that 0x0a260005 was a valid value for some models with HD4600 and changed it to that in an attempt to fix the graphics corruption. It definitely didn't work with either value. My mistake to leave that changed value in there when I uploaded the folder. However, you have hit on the correct solution as deleting that redundant addition from the DeviceProperties section of the OC config altogether seems to have fixed the corruption. Thanks for your help! OK, forget that last line. Deleting the DeviceProperties addition results in the acceleration being turned off. About This Mac has a blank line where the GPU should be listed. I've removed the patched DSDT and re-enabled the DeviceProperties addition (now using 0x0a260006) and the acceleration has been re-enabled but the glitches have returned. Clover sets a number of properties relating to the framebuffer that OC does not, so I'm going to see if there's something I can duplicate to get it working.

Here are the two files. To my eyes it appears that the UI is using acceleration but who knows. Something is causing corruption in my setup. Thanks! ioreg.zip EFI.zip

I've been through the OpenCore setup process on my E6540 (i7-4800MQ, 16GB, HD8790M, etc...) and gotten Catalina and Big Sur to install and work perfectly EXCEPT for video glitches that render the machine unusable. Usually the screen will momentarily blank or glitch at random intervals, but if you try running a Chromium-based browser like Chrome or Edge on it it will go absolutely bonkers. I have looked around and not found a way to fix that particular issue, which is a shame as it works perfectly otherwise. I switched to a Clover-based boot folder that results in a system that appears to function just as well but has 100% working video. The downside of that setup is that it takes a bit longer to boot. I would be very interested to find out if there is a configuration for OpenCore that fixes that video issue.