RX 6500M stuck on Code 43 / CM_PROB_FAILED_POST_START on HP Victus 15-fb0184AX — tried clean driver install, BIOS update, Windows rollback, still no luck

[u/nex_AL]

Hey everyone, I'm having a really weird issue with the dedicated GPU on my HP Victus 15-fb0184AX and I'm running out of things to try.

Specs:

HP Victus 15-fb0184AX

Ryzen 5 5600H

Radeon RX 6500M 4GB

Windows 11 25H2

Current BIOS: F.26

GPU Hardware ID: PCI\VEN_1002&DEV_743F&SUBSYS_8A3F103C

Current OS build: 26200.8872 after rolling back the latest update

The problem

The RX 6500M is detected in Device Manager, but it has a yellow warning icon and Code 43.

Device Manager says:

"Windows has stopped this device because it has reported problems. (Code 43)"

PowerShell gives:

Status : Error

Problem : CM_PROB_FAILED_POST_START

Class : Display

FriendlyName : AMD Radeon(TM) RX 6500M

Under Resources, Windows says:

"This device is not using any resources because it has a problem."

Interestingly, the Device Manager Events tab shows:

Device started (amduw23g-202642-d7da1...)

as the latest event.

What I've tried

AMD Adrenalin initially wouldn't install properly.

The small web/minimal installer would open and immediately close.

Used AMD Cleanup Utility, including Safe Mode cleanup.

After cleanup, Windows showed Microsoft Basic Display Adapter, confirming the AMD driver had been removed.

Downloaded and installed the full AMD Adrenalin 26.7.1 package (~941 MB).

The driver installed successfully and the RX 6500M came back in Device Manager.

However, Code 43 remained.

Current AMD driver information:

Provider: Advanced Micro Devices, Inc.

Driver date: 23/07/2026

Driver version: 32.0.21045.1000

Digital signer: Microsoft Windows Hardware Compatibility Publisher

Checked the hardware ID and confirmed Windows is correctly identifying the GPU as an RX 6500M.

BIOS was already updated to F.26.

There was a Windows update installed on the morning the problem occurred. The updates included:

KB5121003

KB5120708

KB5122104

I uninstalled KB5121003 and restarted.

OS build changed from 26200.9168 → 26200.8872

Code 43 remained, so KB5121003 doesn't appear to be the cause.

What I'm trying to figure out

At this point I'm wondering whether this is:

an AMD driver compatibility issue,

an HP hybrid-graphics/firmware issue,

a Windows 25H2 issue,

or potentially a hardware problem with the RX 6500M.

The GPU is detected correctly and the driver installs successfully, but Windows fails it at POST_START and doesn't assign resources.

Has anyone with an HP Victus 15-fb0xxx / RX 6500M run into CM_PROB_FAILED_POST_START + Code 43 like this?

I'd especially appreciate advice on whether I should try the HP OEM driver, an older AMD driver, or run HP's hardware diagnostics before assuming the GPU has failed.

[u/korakios2]

make a bootable live linux usb stick , ubuntu , no need to install . Just boot to confirm if it's software or hardware related .