Bug#1126569: general: Black screen after woken up from sleep

[John Doe <johndoe@email.com>]

Package: general
Severity: important
X-Debbugs-Cc: johndoe@email.com

Dear Maintainer,
When I lock my computer by pressing Windows+L key on Gnome my computer to into sleep mode.
I have an external 4K monitor (27" Asus ProArt PA279CV) and when I want to wake up my laptop from sleep I have a black screen and no input from external keyboard or laptop's keyboard.
I'm force to perform a hard shutdown of my laptop.

I'm not able to replicate this bug everytime, it happens randomly.

I expect my laptop to wake up from sleep and work normaly.

Best regards.