Install Ubuntu on Lenovo Slimpad 3x

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I did manage to start Ubuntu on that Asus Vivobook as best described in

Looking for support on installing Ubuntu on Snapdragon X

This is most likely the reason for my efivars error. I did follow @glathe advice and used one of his extended ISO images with Vivobook S15 as an “alias” for my laptop. It did boot and I was able to Try Ubuntu. I didn’t connect to a network, screen looked as expected, used the laptop keyboard and pad. I tried a few apps like Files and Terminal. The fan cooler was active all the time, so the Power management didn’t seem to be working properly.

But that was a bit of a hack and I didn’t pursue the path of creating my own device tree.

There is support if you want to DIY, try asking people that were active in that thread.

Good luck