I think that the ThinkPad X13s Gen1 might meet these requirements. It is my favorite ARM Linux laptop I've ever used. It has great support in Debian 13 (trixie), and it feels pretty smooth and fast. It doesn't have any fans, stays cool, and I regularly get a full day's worth of battery life out of it with margin to spare (10-12 hours). It's better than the newer Snapdragon X1 Elite based ThinkPads, in my opinion, even though it isn't quite as fast because it is passively cooled, is easily fast enough that I've never noticed it feeling "slow", has good driver support in mainline Linux and Mesa (which took a few years to be fully worked out, but is there now), and it's readily available for a good price (on eBay).
oliwarner|1 month ago
Ubuntu but I'd change for sleep.
Rayosay|1 month ago
I'd guess that the X13s hardware support in Ubuntu is likely as good as Debian, and switching probably wouldn't help you much. I have noticed that newer kernel versions (notably 6.12 and later) and the latest firmware (as of sometime last year) really fixed a lot of little issues for the X13s. That probably makes a bigger difference than the distro. I'd check to see which versions you're using.
zekrioca|1 month ago
Rayosay|1 month ago
Personally I'd still just get a used ThinkPad X13s Gen 1 on eBay at this point if I were going to buy another one today because they're available for around $400, and I don't see anything better that's passively cooled, with great battery life, and great Linux support available at the moment. I hope there will be a better, faster alternative in the near future. I'd gladly upgrade.