Yup. It’s a real shame they haven’t elected to release it.
PCIE card draws a maximum of about 0.7w at 12v with no real spikes to speak of. So that put’s it at about 8.5w.
So well within the 5v3a the usb port can provide.
I think rather than abandon the battery, I’m going to pull the 5v from a USBC port, and trigger it with a reed relay from something like the keyboard or power button backlight LED 5v line.
It needs to have power before the host pcie bus is initialized, unfortunately this stuff doesn’t just hotplug.
Is there like a usb charging or something bios setting? Having power on usb ports when of isn’t really normal.
Also ever considered an usb capture card?
I’ll have to test it out, but I imagine something like the on button would be pretty immediate after turning on the laptop, hopefully well before the PCIe bus.
I don’t think there is. I certainly can’t remember it and if you Google it there are a couple of topics here and on Reddit about wanting to disable it but it not being an option. It’s not an uncommon feature, definitely something I have seen before and allows things like charging a phone from your laptop without it needing to be on. Some laptops do indeed allow the ‘feature’ to be turned on or off, but from reading online it doesn’t seem the FW laptop allows it. I will double check next time I’m in the BIOS.
I’m pretty well versed in the area of capture cards, I work in TV, and this custom enclosure is a tool for my job. This is the only realistic way of achieving what I’m setting out to do. A USB capture card wouldn’t do the job unfortunately. This card have 4 independent I/O channels (can be either), which you cant get from a USB bus powered device. There are m.2 capture cards as well, but they only offer 1in 1out.
Better than nothing I suppose.
Fair enough, just would have been kinda silly if that wasn’t already excluded XD
Indeed, and it’s easy to miss something obvious when your head is in another space.
I have confirmed the 5v from the USB connection on the keyboard/touchpad/fingerprint connector activates immediately when the motherboard is turned on, so it can be used to trigger a relay to turn on the PCIE card when the computer boots. So for now this is the solution I’m going with.
Absent better options:
