Jake Lo

Don't know, what wifi / BT does it have installed? You could ignor those error if your system boots and battery status is showing correctly

bootarg under NVRam should take precedence alcid=12 But looks like it's coming from the DSDT under HDEF is set to 14

Remove IO80211Family and it's plugins from Config file

try to see if this boots with graphics acceleration. then we'll fix the rest config.plist.zip

If I'm not mistaken, this model also comes with a discrete card. That needs to be disable via SSDT patching.

are you sure, bottom of list also shows i7-6820hQ which is Skylake. You can easily confirm by checking it in the BIOS

That's because iGPU is enable only if Switchable graphics is enable in BIOS. If you disable it, then only the Nvidia is on but it's not supported. What's the specs of your 7520? Need to determine if you have Skylake or Kabylake processor

Try this, replace Config and add ssdt to /ACPI Enable switchable graphics in BIOS 7520-DisableDGPU.zip

see here about proper tree

Post your EFI folder for review

TextEdit might have corrupted the file. You may use apps like Xcode, ProperTree, or PlistEdit Pro instead.

you'll need to set DVMT with EFI shell as Bronxteck said above

EC is actually ECDV in DSDT.aml, so it needs the rename and SSDT-EC.aml. I've made the changes using SSDTTIme to generate new files from the latest BIOS. New bootpack has been added to the guide.

No need to quote me on responses. The files on the 1st post, can that still boot? I am confuse about where you get the IOReg file since it shows MBP13,1 while all your Config file shows MBP13,3. Did you use different files to boot when you extracted the IOReg file?

what I mean is can you boot to Big Sur successfully with the files you last posted? YOu said that's what you have on the USB, but can it boot your Big Sur on the 7520? If not, then post the files that can

does it boot with this USB?

like I said, you made some changes with your files. I only edit what you posted. you should post your latest file so I could update that. You could also add the changes I made to your latest Config

Here, I added the patches for XOSI. Also added patches for Brightness Fn key and SDCard reader kext. Move the kext and SSDT* to the correct location and replace your Config file 7520_FnBrightness.zip

CPU0 is correct. Not sure how I end up with PR00. If you encounter KP, it might be due to somewhere else, not SSDT-Plug. What error are you encountering with your files? Try this version SSDT-PLUG.aml.zip

Post your files

Hmm, did you make some changes? In your Config file, you have MBP13,3 as SMBIOS but IOReg file shows MBP13,1 Anyway, you need to add SSDT-XOSI + ACPI patch.

@Hpbrown in accessibility/Pointer Control Do you see an option to enable lock to drag or don't lock to drag or some thing similar? I don't own any Alps I2C touchpad so you'll have to look around the options...

@Hpbrown If you 2 fingers scrolling, tap to drag, 2 fingers right click and mouse movement, that's the BEST you'll get for this unsupported Alps I2C touchpad.

Please post IOReg file with IORegistryExplorer.app v2.1

@Hpbrown I made a mistake on the brightness fn key I posted. It's a simple fix, just need to rename all of IGPU to GFX0 in ssdt-brt6.aml. For OpenCore it needs to be GFX0, but for Clover IGPU works. If you just replace SSDT-BRT6 from aaugutowski's file to your current file, it'll work as well.