X230 Corebooted -> resume broken

[[799]]

Hello,

I have coreboot'ed my Lenovo X230 a while ago and run it with SeaBIOS as I needed a DualBoot Setup (Qubes OS + Win 10).

After I had issues with standby/resume I decided to delete windows and run a Qubes OS only setup.
in order to troublesshoot the problems with standby/resume, I decided to reflash the stock rom and reinstalled Qubes from scratch.
Unfortunately it seems that the problem with standby is still there:

If I close the lid, the laptop shuts off. It seems that it doesn't run a real clean shutdown as the shutdown is way to fast.

Question:
Could it be that something "broke" internally while flashing/reflashing Coreboot?

Where can I start troubleshooting?

I have already reset my BIOS to factory defaults - problem is still there:

Close the laptop lid -> laptop goes off within.3sec.

[799]