u/byronaz

Laptop Specs:

• Model: ASUS TUF A14 (2024/2025) FA401
• CPU: AMD Ryzen AI (9 HX 370)
• GPU: NVIDIA RTX 4060
• OS: Windows 11 (Clean Install)

The Situation: I have a very specific "Handshake" issue.

• The Good: My internal screen stays on perfectly in the BIOS menu. No flickering, no grey screen, no blackouts. The hardware seems fine.
• The Bad: The moment I boot into Windows, the ASUS logo appears for 1 second, then the screen goes Black or Solid Grey.
• The Context: I can hear Windows sounds and use an External Monitor via HDMI perfectly. The keyboard stays lit.

What I have tried:

1. Full Clean Install: Wiped all partitions, reinstalled Windows 11 (Offline OOBE).
2. Driver Order: Installed AMD Chipset, ASUS System Control Interface v3, AMD Graphics (VGA), and NVIDIA Graphics in the "Holy Order."
3. The Trigger: The screen died right after the MediaTek WLAN/Bluetooth driver installation.
4. Device Manager: "Video Controller" and "PCI Data Acquisition" were showing yellow exclamation marks until forced updates.
5. Refresh Rate: Tried forcing 60Hz via an external monitor; the internal screen flickered but stayed black/grey.

The Theory: Since the BIOS is 100% stable, this is clearly a driver conflict between the AMD Ryzen AI iGPU and the MediaTek Wi-Fi card (which I know share a PCIe power bus). It seems like the AMD driver is aggressively undervolting the panel or failing the handshake when transitioning from the BIOS "Basic" driver to the "Adrenalin" driver.

Question: Has anyone found a specific VBIOS or Registry Fix (MPO?) that stops the TUF A14 from "killing" the internal display signal during the driver handshake? Is there a specific AMD driver version that actually works with the MediaTek card without crashing the display bus?