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Why does my computer slow down so much when attaching Bluetooth dongle?

Why does my computer slow down so much when attaching Bluetooth dongle?

I have a Bluetooth dongle and I plugged it into my work laptop (a Dell Latitude D830). Windows detects the Generic Bluetooth USB or similar and then proceeds to go incredibly slow with a process, avp.exe¹, taking 50% CPU. The System Idle process is getting most of the other 50% CPU and the avp.exe process is only at Normal priority.

Asked by: Guest | Views: 116
Total answers/comments: 1
Guest [Entry]

"I've seen similar behavior, in a USB parallel device. Leaving the device plugged into the machine would result in the machine taking 10x as long to reboot, and it would be 100% repeatable. Unplugging the USB adapter during the reboot restored the machine to normal speed; once it was booted into windows, you could plug it back in. The BIOS was having an issue with it, and once Windows loaded, it no longer mattered (because the Windows device driver took care of it).

As it is the internet suite that is eating up CPU time, I'd guess that it ""thinks"" that the device is internet-capable (has an IP stack) and it's attempting to latch onto the device and start monitoring any packets that come through. As the device really doesn't exist in windows-driver-land, there's probably just a stub entry there that Windows is using as a placeholder until the device drivers are fully installed. Because the ""stub"" isn't the real thing, your scanner is going berserk as it tries repeatedly to latch onto it but it is refuted at every turn. ""Must...attach...and...filter!"" it keeps screaming, but the stub sits there and is mute...so the cycle continues."