Will it ever ship with coreboot and linux support ?
As for Linux support, it's already there. There are papercuts, like needing a fairly recent kernel and certain packages (for the fingerprint reader), but it works fine, by all accounts.
I'm expecting my DIY edition to ship in the next week or so, and I'll be running Linux on it full-time.
Wait, Framework has a fingerprint reader? Hope it's not built-in. That's a strong security anti-feature to have in an otherwise good-looking laptop.
You pretty much have the option between s2Idle, s2deep, and hibernation. The s2Idle mode is really responsive, but it drains battery at a really high rate. s2deep isn't technically supported IIRC; I was able to turn it on and have seen the battery life under sleep improve, but it takes about 10 seconds to wake up to a point where I can log in.
If I know I'm going to be away from my laptop for a long time, I'll generally put it in hibernation mode.
There might be a better solution out there, but the general consensus seems to be that Linux + Tiger Lake aren't a great marriage at the moment when it comes to sleep.
Arch Wiki tells you how to use s2deep, if you want to enable it: https://wiki.archlinux.org/title/Laptop/Framework#Suspend
EDIT: I said 10 minutes before, where I meant 10 seconds. Sorry about that.
It's easier to turn it off at that point
Hopefully it will be fixed with time
And while s2deep does help a lot, it's still pretty far from perfect - certainly not the kind of sleep you'd get from a recent MacBook.