My laptop won't sleep or hibernate when the lid is closed

When I close my laptop lid, my laptop doesn't go to sleep or as I specifically chose, hibernate.
What is going wrong and how can this be fixed?

Is Hibernation enabled?
I expect the answer is that it is but do check by running this command
PowerCfg -a

Please do post the results so that sleep issues can also be discussed.
I suspect that you do not have S3 Sleep [the "sleep" that we have all come to know over the past few decades] but instead have S0 Modern standby [aka S0 Low power idle].


Denis

I'm still on 22H2, but here are the settings I use with my HP laptop. I have been using these settings for years without any issue. I just close the lid and everything shuts down. When I open the lid, and press the power button, everything comes back up.

When I run "PowerCfg -a" I get the following.

PS C:\Users\marti> PowerCfg -a
The following sleep states are available on this system:
Standby (S3)
Hibernate
Hybrid Sleep
Fast Startup
The following sleep states are not available on this system:
Standby (S1)
The system firmware does not support this standby state.
Standby (S2)
The system firmware does not support this standby state.
Standby (S0 Low Power Idle)
The system firmware does not support this standby state.

1 I think you'll need to monitor Event logs to see if it is trying to hibernate but failing or not even trying.
You can import the Power - Sleep-Hibernate-S0 transitions Custom view I use for this - Import Custom view - #4 - TenForums [read from the line starting with I suggest through to that beginning On a similarly confusing note]
This Custom view definition works in both Win10 & Win11 and in both S3 Sleep computers & S0 Modern standby computers.

2 Did it work before but suddenly stop working?

3 Personally, I'd reinstall the display driver in order to eliminate the possibility that it has become corrupted.

4 Does Device manager show any warning triangles or have an Other devices section [which means no driver found]?


5 Do Sleep & Hibernate work at all?


Denis

How old is the laptop? If it is old then could the lid-close microswitch be faulty? It may not be registering that you have closed the lid if it is faulty.