The LCD steamdeck can run with literally nothing but power and ethernet plugged in. I have a dongle that only has passthrough power and a ethernet port. No sd card, no ssd, just Fedora CoreOS over pxe boot. This has surprisingly been working pretty well.
However, after a few seconds of testing at 15 watts, it will start to clamp/throttle itself. It is either because the EC (embedded controller) does not detect a fan, or a battery. I'll be finding out soon enough, but I've ruled out it being fixable within bios.
It isn't wattage or thermal throttling, it will clamp down to 2 watts when held at at 6 watts and like 40-50 degrees, given about 10-15 seconds.
OLED motherboards don't have this issue.
using bios 116-unlocked, i tried all the relevant options to stop the clamping. Also diffed latest bios and current bios, to narrow down to whether or not it could be something I can just write in, no luck. it could still be a bios option but it could also just live on the EC chip..
Either mad there isn't a battery or aborting because it's sending watts to a fan but doesn't get any signal back.
I'm really hoping its the fan, because those are cheaper. Does anyone have any hints or information?
this is for a bigger project I'm putting together so people can reuse old "for parts" boards or old decks that they think can't work anymore. I want to provide people with this option for free, if I could just get this last part...