The more important question is, are they running mainline Linux, close to mainline Linux (like Raspberry Pi, or outdated much modified unmaintainable vendor and device specific fork (like Android phones do).
it's very possible to get linux to run on a processor without having implemented al functionality. You can just not support some onboard peripherals yet and have to do some things inefficiently in software. You don't need good power management to simply be "running", etc.
Getting linux to run is the first step, not the last. It's the barest minimum you could do to have a product to sell. Running well, taking advantage of all hardware features properly is a whole different game.
I'm not talking about drivers for stuff that is not the cpu itself. But the processor itself usually contains a bunch of peripherals that need their own stuff.
If someone could spit out some nice high-performance RISC-V CPU with an integrated open-source and most importantly mainlined GPU (which also includes a video encoder/decoder which could handle 4k 264, 265* and AV1) ... I'd be SO happy....
Yes, I know the intellectual property/digital restrictions management cesspit would do everything they could to prevent this from happening. One can dream, though.
Yes, it runs Linux (you didn't hink they were shipping it with Windows on it, did you?). Debian, Ubuntu, and Gentoo should all have support. I don't know about Arch.
We could have had ARM laptops much earlier, if some manufacturers at least tried to. I cannot really believe that the same chips that power SBCs couldn't been put into some small laptops.