ARM support is still mediocre, but it's improving with the new Snapdragons. Every generation seems to make running normal Linux on those things a little bit less of a pain.

Funnily enough, the device with probably the best "normal" desktop protocol support is the old Windows RT tablet, which features an ARM SoC that runs UEFI and ACPI and everything. It's locked down to Microsoft's secure boot keys, unfortunately, but thanks to Microsoft abandoning the device, there are exploits you can use to bypass that.

The Thinkpad x13s is pretty good for a mostly normal arm Linux laptop. The SOC is still pretty usable and it's functionality on Linux is also pretty complete. The main thing lacking is the speakers are very low to protect them from blowing out without a proper driver.