This issue with blanking video screen affect me also in Ubuntu 18.04.5 and Ubuntu 20.04.1. Not only with Lubuntu. I tried also Fedora 34 and I also had this issue so I think that this is problem with kernel or video driver. How I can help you with find fix for this issue? I can send apport report but only for developer visible.
This issue with blanking video screen affect me also in Ubuntu 18.04.5 and Ubuntu 20.04.1. Not only with Lubuntu. I tried also Fedora 34 and I also had this issue so I think that this is problem with kernel or video driver. How I can help you with find fix for this issue? I can send apport report but only for developer visible.