What could be the reasons for sleep not working properly on Lenovo V580c?

Question

laptops

There is a Lenovo V580c device, which has been serving faithfully since 2014. A couple of days ago, a strange problem began, namely, after closing the lid of the laptop with the OS turned on, instead of going to sleep, the machine turns on in a second as if the lid was opened and continues to work. When opened: does not go to sleep, continues to work.
OS: Kubuntu 18.04.3 LTS

Answer 1

Lol, I read the title of the topic and thought: "Probably, TS Linux."
Just crooked drivers on ACPI, roll back to the previous kernel (you can select the old one in GRUB), then unsubscribe.