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Dell E6430 bios revision A18

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Can someone explain why we cannot upgrade the Dell E6430 to the latest A18 BIOS? What is preventing us? I have DSDT and SSDT edits in place and have able to get my E4630 to essentially 95% of a real mac, I still cannot restart without Optimus being disabled. Now at A18, from A12, I get horrible screen corruption. It is similar to when the system is booting up, but this is all the time. It seems to affect windows with inactive content - for instance this text box i'm writing this post in is clear, but everything around it is corrupted. 

 

Please see attached photo for example:

post-93263-0-03491600-1468206587_thumb.jpg

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Hey Jake, thanks for responding. I was actually able to get it to work with A18 BIOS! I just had to do this kext patch using CloverConfigurator under "Kernel and Kext Patches" section:

 

Name: IOGraphicsFamily

Find* [HEX]: 0100007517

Replace* [HEX]: 0100007417

Comment: Boot Graphics Glitch - 10.11

 

I apologize for starting a new thread, but I was getting frustrated... Just happened to stumble on a fix after posting.

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The patch you mentioned is only for the brief second before it gets to the login screen. It does not fix the graphics artifacts for the E6x30 model with HD 4000 with BIOS higher than A12.

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Seemed to have helped me... I also enabled this:

 

Graphics -> check "Inject ATI" (even though I don't have ATI) and "Inject NVIDIA" (Even though disabled with DSDT)

System Preferences -> check "Inject system ID"

 

Right now I am running the A18 BIOS, with DSDT/SSDT edits to power off the NVIDIA GPU, and no graphics artifacts as referenced originally.

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