So recently I decided to migrate my old hackintosh installation from Clover (which is a hot mess) to OpenCore, thinking that I would waste a whole week fixing things up I also updated to Big Sur and things went quite well.
My E5540 has
Intel Core i7 4600u
Intel HD 4400 / Nvidia GT720m (disabled)
Realtek ALC292
Intel Wifi/BT
---Working---
Graphics Acceleration
Brightness Control
Touchpad/Keyboard (w/gestures)
DualBoot W11
Audio
HDMI
Wifi (Heliport)/BT
Battery Management
Camera
Apple Services
---Not Working---
Sleep (I already disabled hibernation and mapped USB ports, don't really know what else to do)
The headphone audio was screwed up with distortion noise, i ended up fixing it with Codeccommander and ALC_fix from this other post
The EFI folder is larger than the size allowed by the site, so if you have this relic of a laptop, and you want to test your luck I'll leave a link to the Google Drive folder containing it.
https://drive.google.com/drive/folders/11ekszPurjTVTb8myid8OIhNQR_rg2Ch4?usp=sharing
Thanks!