[REGRESSION] Black screen after splash with Linux 7.0 on MSI Creator A16 AI+ (AMD Strix Point + NVIDIA)

Hello,

I am seeing a reproducible boot regression with Linux 7.0 on an
MSI Creator A16 AI+ A3HVGG laptop.

Last known working kernel:
   Ubuntu/Mint kernel 6.17.0-41-generic

Affected kernels:
   7.0.0-27-generic
   7.0.0-28-generic

Symptom:
   The system reaches the Linux Mint splash screen, then the display turns
   completely black. No graphical login screen is visible and switching to
   a TTY with Ctrl+Alt+F2 does not produce visible output.

   The system appears to continue booting: logs from the failed boot show
   that amdgpu and the NVIDIA driver load and LightDM starts. I did not see
   a kernel panic, GPU reset, amdgpu timeout, or obvious Xorg crash.

Regression status:
   Reproducible with both tested 7.0 kernels.
   Booting 6.17.0-41 restores normal display output.

Hardware:
   Laptop: MSI Creator A16 AI+ A3HVGG, motherboard MS-15FK
   CPU: AMD Ryzen AI 9 365
   Integrated GPU: AMD Radeon 890M / Strix Point
   Discrete GPU: NVIDIA GeForce RTX 4070 Laptop GPU
   BIOS: E15FKAMS.316, dated 2025-09-11
   Desktop: Linux Mint 22.3 Cinnamon, Ubuntu 24.04 base
   Display manager: LightDM
   NVIDIA driver: 595.84 open kernel modules

Display configuration:
   Internal panel: 2560x1600 at 240 Hz
   External monitor: 1920x1080 at 120 Hz via USB-C DisplayPort Alt Mode
   The AMD GPU drives the displays.

Relevant messages seen in the failed boot include:
   NVRM: failed to get target temp from SBIOS
   NVRM: failed to get platform power mode from SBIOS

There are also several ACPI BIOS error messages, but these are present or
similar on the working kernel as well.

I can provide the complete logs and test additional kernel parameters or
patched kernels.

#regzbot introduced: v6.17..v7.0

Regards,
Alexander Zorn