Am Fr., 1. Nov. 2019, um 17:25 +0100 schrieb Petra R.-P. <de...@prp.in-berlin.de>:
> Maybe I should mention that this old notebook is running with an > external monitor because its own display is faulty. I have just performed the (weekly) Debian testing updates on my other computers (the problematic notebook I was writing about is updated on a daily basis): -> another Thinkpad T41, but with intact display and without external monitor, -> a Thinkpad T420, -> a "normal" PC. There was no problem with any of them :-) So the cause of the problem may well be the external monitor, or HW acceleration. How can I find out if this is activated in the "good" T41? Best regards, Petra