JingPad A1 – Consumer-level Linux Tablet

Let me be the FIRST to say that the landing page is a bit overenthusiastic.

I guess sell first, develop second, right? - good luck from my side. If you manage to come even close to the claimed features I will buy one.

Is there a linux OS which would be best suited to run on a decade old laptop in portrait mode, mostly for reading PDFs?

I am unconvinced.

First of all, Android is Linux based, and not an unpleasant userland if you install Termux and use LineageOS or some other custom fork.

Second, even if you don't count Android, there's still Ubuntu Mobile, and PostmarketOS, and Sailfish, and Mobian, and others, all of which existed before this as far as I can tell.

Third, this website is drowning in rough marketing speak, with little substance.

I came in with high hopes, but am unimpressed. Maybe this is overly harsh, it's definitely a hard market.

Edit: The closer I look, the more unconvinced I get. I wish you luck, but maybe get something to show first next time.