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I probably should add a note in the guide regarding Alps v7/8 support. Currently there is NO Alps kext that would run smoothly on E7270/ E7470, that's why I have ApplePS2Controller.kext in my bootpacks for models with Alps touchpad above v5. Although it doesn't detect it in Trackpad preferences it'll work perfectly smooth. 2 fingers scrolling works(only up and down, not sideway), 2 fingers right click, drag and drop. There is a slight issue with CAPS lock, you'll need to tab twice to lock and twice to unlock. As for VoodooPS2ControllerR6Bronxteck.kext, although it fixes the CAPS lock issue, I find it harder to use. It's not as smooth, perhaps I could adjust the ZFinger value for better support but I have not bother to since it disables the Trackstick on the E7470 and E7450 which I prefer over Trackpad. With the additional 3rd party software like SmartScroll.app, I was able to scroll smoothly up and down, side to side with ApplePS2Controller.kext. I guess it's up to your preference since E7270 does not have the Trackstick.

Brightness Control key has been implemented in my Catalina bootpack with hot patches https://osxlatitude.com/forums/topic/6472-dell-latitude-e7240e7440/?do=findComment&comment=86943 Although slightly different value, the Fn+Arrow Up and down works with VoodooPS2Controller.

Obviously, it's a DSDT patch. Also obviously, you insert the patch code in the DSDT sections that are indicated... This very classic patching script is meant to be applied from iASL tools such as goold old DSDTEditor (a bit obsolete these days) or MaciASL. You may consult my E6220, E6230, E7250 or 7490 guides where I've detailed and explained exact same patches (albeit with different values). An alternative, details of which were posted by @Jake Lo, you could implement equivalent changes through a dedicated SSDT.

Hi. Which VoodooPS2 kext are you currently using? Never mind... You could try to replace your "ApplePS2Controller.kext" with the kext i attached for you. VoodooPS2Controller-R6Bronxteck.kext.zip

Farewell old girl.... she was the last bastion of our original "D" series that started the whole OSXL endeavors..

I was able to obtain OpenGL-only graphics acceleration by making a fresh Catalina 10.15.4 installation with DosDude1's patcher. I wish I would have had time to suss out the detailed post-install patching process for upgrades from earlier Catalina versions but I've just sold the D630 and it's going today. My contribution to installing macOS on this old lady therefore stops here... It was fun for the many years it lasted. Leopard 10.5 to Catalina 10.15 has been a pretty good, not to say impressive, run...