So X1 Carbon works well with Linux?
The 7th gen has two different screen options. I gather you got the higher density one. I don't use Ubuntu but I have the same display and don't have scaling issues. I use Arch & OpenBSD and configure everything myself though.
> Speakers are incredibly quiet.
Mostly a PulseAudio issue (doesn't play well with 4 speaker configurations). Has multiple workarounds (2 speaker only and to use all 4). I got it working in an hour. Full fix coming in next major version.
> Suspend / hibernate does not work reliably.
Has had a fix since February
Also, Lenovo now directly supports Linux on some of their laptops, including the X1.