I have a T450 with a issue that I haven’t been able to figure out for years: When I shut the lid, the screen will shut off, and when I open the lid again, I can hear the fans spinning and I know the laptop is on, but the screen WILL NOT TURN BACK ON. I have to hold the power button to force power off and then start it up again.
Issue happens in Windows and Linux. I tried disabling the sleep enhancement feature in the BIOS (can’t remember what it’s called).
So it’s just sitting on my bookshelf. Sad because it works great, but you just can’t close the lid.
Did you disable hibernation ? Is the screen just turning off or is it going to sleep?
Always recommend fully disabling hibernation in windows as it's useless - if it's NOT going to sleep then might be worth messing with the BIOS power settings