I have a Lenovo Ideapad 310 wit an NVIDIA 920M graphics card. I recently dual booted Ubuntu and I didn't have any problems. I've never put my laptop to sleep nor closed the lid without shutting it down.
So today, for the first time, I closed the lid, without powering off, expecting it to be put in sleep mode and ready to work again when opened. When I opened my laptop, there was a black screen with a cursor. The cursor wasn't blinking, unlike every other similar problem I find via google and on here.
I tried updating the drivers with ubuntu-drivers autoinstall everything was already up to date. I also tried a lot of key combinations with Ctrl+Alt+something_else but nothing worked.
