I'm been overly optimistic it seems (based on the hints from this issue: https://stackoverflow.com/questions/59455268/how-to-disable-progress-bar-in-pytorch-lightning ). It really looked like it worked. But I was mislead by the fact that the issue has a peculiar pattern to it: it doesn't appear at the beginning of each epoch. There seem to be a couple of extra cr / flushes at the beginning and then a (puzzling) extra "Validation" log line seems to trigger the continuous scrolling. Anyway, my bad,, that doesn't fix things 😢 .