I've tried time and time again, to fix this. Doing different things to use the canvas, I can draw int he brushes panel just fine but the canvas isn't working for me. It's unuseable, I've drawn with my Intuos4 tablet aswell as my mouse so it isn't my tablet. I've also updated all my drivers, reinstalled krita etc. But it just isn't working. I use Windows 10, on a Dell computer 64 bit.
This is a frequently asked question, and in fact, the first question in the Krita FAQ: https://docs.krita.org/KritaFAQ#Krita_starts_with_a_black_or_blank_canvas_and_nothing_changes_when_you_try_to_draw.2Fshows_a_black_or_blank_screen_on_my_Windows_system_with_an_Intel_GPU The drivers for your display chip are broken, and you should update them and in the meantime you can disable opengl. This isn't a bug in Krita; it's a bug in Intel's drivers.