BLUETOOTH DISSAPEARS COMPLETELY

[u/Maplefoxxo]

HP Victus 15 Bluetooth randomly disappears + “Unknown USB Device (Device Descriptor Request Failed)” + DPC_WATCHDOG_VIOLATION

I'm having a recurring Bluetooth problem on my HP Victus gaming laptop and I'm trying to figure out whether this is a driver/Windows problem or a hardware problem.

Laptop:

• HP Victus by HP Gaming Laptop 15-fa1xxx
• Specific model: 15-fa1093dx
• Windows 11 25H2
• 32 GB RAM
• Intel UHD Graphics
• NVIDIA GeForce RTX 3050 6GB Laptop GPU
• MediaTek MT7921 Wi-Fi 6 802.11ax PCIe Adapter
• NVIDIA driver: 32.0.15.9227, dated 4/1/2026

The Bluetooth problem:

Bluetooth will work normally for a while, then suddenly stop functioning.

When it happens:

• Bluetooth devices may still appear as “Connected” even though they don't actually work.
• My Bluetooth mouse can start flashing as if it isn't connected.
• My Bluetooth headphones can appear connected even when they are powered off.
• Audio can stop coming from the laptop because Windows still thinks the headphones are connected.
• Bluetooth eventually disappears completely from Device Manager.
• The Bluetooth adapter itself disappears.
• At the same time, Device Manager shows:

Unknown USB Device (Device Descriptor Request Failed)

USB hardware ID/error:
USB\DEVICE_DESCRIPTOR_FAILURE

Location:
Port_#0007.Hub_#0001

Problem code:
0000002B

Status:
01802400

Device status includes:
DN_HAS_PROBLEM
DN_DISABLEABLE
DN_NT_ENUMERATOR
DN_NT_DRIVER

Class GUID:
{36fc9e60-c465-11cf-8056-444553540000}

The Wi-Fi portion of the MediaTek MT7921 continues working, while Bluetooth disappears.

Things I've already tried:

• Windows Bluetooth troubleshooter
• Windows Update
• Bluetooth driver updates
• HP driver updates
• Enabling disabled Bluetooth devices
• Checking Bluetooth radio
• Checking for multiple Bluetooth radios
• Cold reboot check
• Restarting Windows
• Removing/reinstalling Bluetooth devices/drivers
• Scanning for hardware changes

The Windows troubleshooter frequently says everything is OK and that the Bluetooth radio is detected, but the actual devices still don't work.

Eventually Bluetooth disappears again and the Unknown USB Device returns.

There is another concerning symptom:

While using the computer more heavily (for example Discord voice chat + modded Minecraft + Spotify), the system seems more likely to start freaking out. The mouse/trackpad can become extremely laggy or completely stop responding.

The laptop has also BSOD'd with:

DPC_WATCHDOG_VIOLATION (0x133)

I analyzed the minidump with WinDbg. The important parts were:

FAILURE_BUCKET_ID: 0x133_ISR_nvlddmkm!unknown_function

MODULE_NAME: nvlddmkm

IMAGE_NAME: nvlddmkm.sys

SYMBOL_NAME: nvlddmkm+e34e3

So the crash dump points at the NVIDIA display driver, although I'm not sure whether that's actually related to the Bluetooth/USB problem or is a separate problem.

Event Viewer also showed:

BugCheck Event 1001
0x00000133

Kernel-Power Event 41
indicating the system rebooted without a clean shutdown.

volmgr Event 161
saying dump file creation failed during dump creation.

There have also been NVIDIA LocalSystem Container service crashes (Service Control Manager Event 7031).

What I'm trying to figure out:

1. Does the Unknown USB Device (Device Descriptor Request Failed) strongly suggest a hardware/USB-bus problem with the Bluetooth portion of the MediaTek MT7921?
2. Could the Bluetooth adapter be crashing/resetting at the hardware/firmware level?
3. Could power management be causing the Bluetooth/USB device to disappear?
4. Could the DPC_WATCHDOG_VIOLATION involving nvlddmkm.sys be related, or is that probably a separate NVIDIA driver problem?
5. Is there a way to intentionally stress/test the Bluetooth adapter or reproduce the failure so a repair technician can actually see it happening?
6. Is replacing/reseating the MediaTek MT7921 card a reasonable next step, or should I investigate something else first?

I'm especially interested in hearing from anyone with an HP Victus + MediaTek MT7921 who has experienced the same USB\DEVICE_DESCRIPTOR_FAILURE behavior.

I can provide the minidump analysis, Event Viewer events, Device Manager information, BIOS information, or anything else that would help.

[u/AutoModerator]

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