I have a Dell XPS 13 2-in-1 running under Ubuntu 20.04 The pen (PN579X) was working well but suddenly stopped. Could anyone advise on how I could fix the problem?
Hard to tell what has happened as it suddenly stopped working. Posting error logs, hardware configuration and such is always a good idea in order to get help. In any case, most do not get the PN579X working out of the box on 20.04. Upgrading to 20.10 seems to do the trick for some, see also this post.