Hello, I would like to ask whether it is technically possible to limit Framework Laptop 13(AMD 7040 series)'s power draw from the type-C port from software/firmware/embedded controller even if the power source support higher charging wattage. I would like to prevent the laptop from draining my powe…

It’ll just charge up the laptops battery, so it’s not as if the power is just gone. Or you’re actually using it because CPU/whatever is running and crunching whatever. So I think the proper question is what are you doing that’s causing the laptop to use more power. If you’re playing a game or doing …

[image] Aaron_Baff: It’ll just charge up the laptops battery, so it’s not as if the power is just gone. I want my power bank to be able to charge my other devices while keeping the laptop’s battery at a relatively high capacity. I don’t need to charge the laptop to 100% while I’m outside.

Can’t you charge your other devices from the FW in that case? Also, if it’s already at or near 100% before you put it on the external battery, it won’t use any more power than the laptop is actually using to run itself. Otherwise it’ll start to run down it’s internal battery. Basically you’re talk…

with “ectool” you can set “chargecurrentlimit”, see Exploring the Embedded Controller

[image] Aaron_Baff: Can’t you charge your other devices from the FW in that case? The power bank supports more voltage/current combinations then the Framework Laptop’s type-C port and is preferred to be used. But I don’t know that anyone has ever thought that’d be something they want to do. …

[image] pierce: with “ectool” you can set “chargecurrentlimit”, see Exploring the Embedded Controller While that option sure is helpful it is slightly different from what I needed in this post, which is to limit the maximum power draw instead of the maximum battery capacity to stop charging. …

[image] brlin: it is slightly different from what I needed in this post, which is to limit the maximum power draw instead of the maximum battery capacity to stop charging It is in fact what you wanted - there is both! “ectool chargecurrentlimit” is the power draw limit (… if you factor in t…

[image] pierce: there is both! I overlooked that one, thanks for mentioning it!

I have a UBS-C charger for my car that gets absurdly hot if I leave it plugged in too long. The real problem is the electrical connection between the 12v socket and the charger’s plug. I know the sockets were designed for cigarette lighters, but it still makes me uncomfortable when it gets too hot …

Limit USB-C port's PD power draw

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Aaron_Baff May 2, 2024, 7:27pm 6

Wow, I had no idea, that’s awesome.

Specifically this comment Exploring the Embedded Controller - #78 by Nils

And full documentation appears to be up at The Framework Laptop's Embedded Controller (EC) :: HowettNET

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Limit USB-C port's PD power draw

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