That's wonderful, and it is a healthy ecological perspective on putting old laptops to new use via Linux; like you, I often find that it works perfectly well.
For all students who are about to buy a new laptop, where is the 'canonical' list that says--do not by that HP but buy such and such Asus instead if you wish to run such and such Linux--but tune it this way? Ubuntu tried to make such a list for a while. Idea: make a Wiki or so for it.