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Everything works, except: - the2nd battery which is not detected, so warning message is displayed early for plug or go to shutdown - usb-c dock works problematic, only one display is possible at a time, either laptop monitor or an external.

Strange after the big sur upgrade the system does not boot, I used again the 840g3 efi to get into the system. I gave up and swapped the ssds with those that I have for windows. @DrInvincibilis have you upgraded to latest big sur?

You EFI works much better than my EFI, i am currently upgrading to bigsur to check that everything remains the same. You could check sometime the brightness buttons, or you can install the brightness slider next to the taskbar clock. Do you believe there is any chance i could make the usb-c...

Thanks, I will try with my usb-c dock of t480 in p51 and see how it goes with your EFI.

Thanks, I have propertree, I will check the link to make the needed changes. Which usb3 to hdmi/dp adapter are you using ? Hmm I have a lenovo usb-c travel adapter with hdmi but i remember it wasn't working. I might give it a try again during weekend. I have a Lenovo ThinkPad USB-C Dock Gen 2...

Could you please share the EFI and some guide how you "play" with this pciroot stuff ? Thanks.

Yes, the errors are because of the hp840g3 ssdt files, but whatever other files I used I had boot issues. if you manage to get the system up with better ssdt files, let me know to give it also a try. If you find also a good usb3.0 to hdmi 4k module let me know, I might order it too. Thanks.

Hmm, storage is an issue. I had a strange experience on a t470 lenovo. The installation was freezing on the apple logo with the progress bar or during the disc partition activities. When I replaced the default m.2 samsung with a WD m.2 on T470, installation was ok. In P51, I do not want to...

Did you disabled all the strange BIOS settings that are not friendly to hackintosh? I checked your HWinfo, it looks we have the same peripheral equipment. Did you copied both folders on the root of the USB stick ? This file works perfect with 840G3, and is the only EFI I managed to install...

@DrInvincibilis you were right, the previous files were wip and not working. Please find attached the working EFI, I just tried it, this is the correct one.

Give me couple of hours to prepare a usb and try to see if installation starts, cause it's been a few months i last tried it. Did you checked the Bios settings ? Intel BIOS settings Note: Most of these options may not be present in your firmware, we recommend matching up as closely as possible...

@DrInvincibilis yes, we have the same graphics, network/bluetooth. I install with recovery image in catalina, with gibmacos.master, and then upgrade to big sur, be careful to keep the usb stick always to be able to boot, cause after the big sur update the system boot loader is messed up. I...

alcid=3 did the job :) external speakers are now ok, plug is still having issues, but i never use it anyway. As soon as i figure out the dual battery thing i will post the final t470 EFI.

thanks i will go through that.

Hello all, I am using the following EFI, which has battery, brightness/sound keys working along with intel lan, wifi, bluetooth. Any advice how to troubleshoot audio with Realtek HD audio ? I am familiar with adding removing kexts, but not with checking if this is matter of patching some files...

Hello, can you please share the EFI for lenovo p51? i am currently using on EFI used for another laptop, but i have no sound, no tv out, no touchpad, only intel 630 and bluetooth and networking are working. Installation done on Catalina, and now upgraded on latest BigSur. My CPU is: Intel®...