Duncan, took a look at the IT8772F data sheet (well, 8712, closest I could find: http://www.hardwaresecrets.com/datasheets/it8712f.pdf ) and it seems that there's no setting of the PCR1/2 registers that will force #PSON high when AC power is applied - it's always conditional on the previous system power state.
I'd be happy for someone else to take a look and tell me I'm misreading though :) cheers, Matt On 3/26/2015 5:21 PM, Matt DeVillier wrote: > On 3/26/2015 9:49 AM, Duncan Laurie wrote: >> On Wed, Mar 25, 2015 at 11:35 PM, Matt DeVillier <[email protected] >> <mailto:[email protected]>> wrote: >> >> 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? >> >> >> >> This might be due to the SuperIO instead of the Southbridge. Panther does >> call it8772f_ac_resume_southbridge() which *should* be making the >> southbridge the one responsible for the power behavior when AC is applied, >> but as a first test you could try removing that call to see if the default >> SuperIO behavior is closer to what you want. > > Hi Duncan, I tried removing the call as suggested, but it didn't change the > behavior at all. Any thoughts as to where to look next? > > thanks! > -Matt > >> >> -duncan >> >
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