New issue by Sqvid on void-packages repository

https://github.com/void-linux/void-packages/issues/50417

Description:
### Is this a new report?

Yes

### System Info

Void 6.6.31_1 x86_64 AuthenticAMD uptodate rrFFFF

### Package(s) Affected

linux6.6-6.6.31_1

### Does a report exist for this bug with the project's home (upstream) and/or another distro?

_No response_

### Expected behaviour

After runit winds down services the laptop should switch off.

### Actual behaviour

Upgrading to kernel 6.6.31_1 prevents the computer from shutting down. Runit seems to stop all services correctly and the screen goes black as expected; however, the keyboard backlight and power light stay on and the fans still run.

##System info:
CPU: AMD Ryzen 7 7840HS w/ Radeon 780M Graphics
GPU: Nvidia GeForce RTX 4060 (disabled and powered off)
WM: Sway

 Downgrading to 6.6.30_1 or below fixes this issue and the laptop shuts down immediately as expected.

Not sure how to extract useful debug info but would appreciate any tips.

### Steps to reproduce

1. Use effected kernel (though it may be hardware dependent).
2. `sudo poweroff now`.
3. Read runit messages of services being stopped.
4. Screen goes black.
5. Laptop stays on.
6. Cry.