Randomly on my laptop screen this appears and debian just freezes. Sometimes these vertical lines don’t appear and system freezes anyway. Its just random. How do i identify if this is hardware or software issue? and then how to identify exact piece of hardware or software causing this problem.
Idk how useful this is but that looks like when i had bad RAM, or like when RAM becomes unseated. You could try reseating your RAM, YMMV.
yeah probably this can be an issue.