My HP Victus 15-fa1093dx running Windows 11 25H2 has an intermittent Bluetooth failure. Bluetooth works normally for a while, then devices stop responding, remain falsely marked as connected, and eventually disappear from Device Manager. At the same time, Windows reports "Unknown USB Device (Device Descriptor Request Failed)" with the hardware ID USBDEVICE_DESCRIPTOR_FAILURE on Port_#0007.Hub_#0001. The Wi-Fi portion of the MediaTek MT7921 adapter continues working.
I have already tried Windows and HP driver updates, the Bluetooth troubleshooter, reinstalling Bluetooth devices and drivers, restarting, cold booting, enabling disabled devices, checking for duplicate radios, and scanning for hardware changes. The issue eventually returns.
The problem seems more likely during heavier use, such as Discord voice chat, modded Minecraft, and Spotify. The mouse or trackpad may become extremely laggy, and the laptop has also experienced DPC_WATCHDOG_VIOLATION crashes. WinDbg identified nvlddmkm.sys, the NVIDIA display driver, as the apparent faulting module. Event Viewer also recorded BugCheck 1001, Kernel-Power 41, volmgr 161, and NVIDIA service crashes.
Could the USB descriptor error indicate that the Bluetooth side of the MT7921 is crashing or resetting at the hardware or firmware level? Could USB power management be responsible? Is the NVIDIA watchdog crash likely related or a separate graphics-driver issue? What would be a useful stress test to reproduce the problem, and should I reseat or replace the MediaTek card after checking drivers, BIOS, and power settings?
3 Answers
After the software and BIOS checks, reseating the MT7921 card is a reasonable next step. A failing or poorly seated card can lose its Bluetooth USB interface while leaving Wi-Fi operational. To reproduce the issue for a technician, use a Bluetooth headset for a voice call while simultaneously placing a sustained load on the GPU and system, then monitor Device Manager for the adapter disappearing and the USB descriptor error returning.
The NVIDIA crash may be a separate problem. Since the dump points to nvlddmkm.sys, use a clean NVIDIA driver removal from Safe Mode and install a stable driver version afterward. Multiple dumps would help confirm whether the same graphics-driver path is involved each time, but the USB descriptor failure itself points more directly toward the Bluetooth device, its driver, power delivery, or the internal USB bus.
Start with USB power management. In Device Manager, open each USB Root Hub and Generic USB Hub, go to Power Management, and disable “Allow the computer to turn off this device to save power.” Do the same for the MediaTek Bluetooth entry whenever it is visible. Also disable USB selective suspend in the advanced power-plan settings for both battery and AC power.
Then remove the existing Wi-Fi/Bluetooth package, selecting the option to delete the driver if available, and install a newer compatible package rather than relying only on the laptop manufacturer’s older bundle. Check for BIOS updates specifically for this model as well. Power-management, driver, and firmware issues can make the Bluetooth function vanish while Wi-Fi continues working.
That makes sense. I would try a separate USB Bluetooth adapter, but I currently need my limited USB ports for an art tablet, so I’d prefer to exhaust the power, driver, BIOS, and card-seating checks first.