I have a Thinkpad L470 running big sur, I'm using VoodooPS2, RMI, and SMBUS
after it goes into deep sleep or whatever the trackpad and fn keys like brightness and volume keys don't work after waking up I already removed the PS2 mouse plugin from voodoops2 but it still doesn't help, without VoodooRMI and VoodooSMBUS that doesn't happen (the FN keys still die though) but without RMI and SMBUS the trackpad feels sluggish and gestures don't work
EDIT: I just noticed something, after the trackpad dies the keyboard still works, and after putting it back to sleep and coming back 30m later the trackpad works again... without me having to reboot...