[coreboot] 'power on after fail' on Panther (Haswell/Lynxpoint)

[Matt DeVillier]

Greetings all!

I was wondering if it's possible to have Panther (Asus ChromeBox - Haswell/Lynxpoint) power on when AC power connected regardless of the previous power state.  Currently, the box will power on if AC power is lost and the device was powered on, but not if powered off.  I have a use case where it would be convenient to be able to power on the boxes by toggling AC power (eg, the boxes are not within physical reach).  I modified the CMOS default setting for 'power_on_after_fail' to be enabled and verified its status with nvramtool.  I also tried modifying lpc.c/smihandler.c in the southbridge code to force MAINBOARD_POWER_ON (rather than MAINBOARD_POWER_KEEP) in all cases, to no avail.

Am I approaching this from the wrong angle, or is it perhaps not possible with these boxes?

thanks,
Matt