Great question — answering as the UphillTech team:
On some Mac Minis (I tested on one circa 2014) it still seems to be: sudo setpci -s 00:1f.0 0xa4.b=0 I verified this after some research. The steps I took to find out, which theoretically can be done for future iterations of these machines too, were: Look for the LPC device: $ lspci | grep LPC 00:1f.0 ISA bridge: Intel Corporation HM77 Express Chipset LPC Controller (rev 04) In this case, it's 00:1f.0. Find a datasheet for the device. E.g. Googling for "intel hm77 lpc controller datasheet" yielded this datasheet . Now you just have to find the right register, which could be a challenge depending on the data sheet. Here I found "5.13.7.5 Sx-G3-Sx, Handling Power Failures, p. 180" in the...
Full answer by Jason C: https://superuser.stackexchange.com/a/1051137 (CC BY-SA 4.0).
Need it done for your business? UphillTech.
