Hi, I've just this problem two days ago. Usually when I wake the pc from sleep, the screen doesn't switch on automatically and I always have to shake the mouse to make it to the connection screen. I always found this odd, but it was ok I guess. But the other day, for the first time, nothing. Black screen. Had to hard reboot. I have an MSI mobo, I don't know if it's important to indicate this, and also an nvidia gpu (rtx 4070 ti super).
Thanks !