Unsupported USB BT device causes high interrupt load

[Dominic Fandrey]

> I have an Interrupt load of 2000 interrupts/s from xhci0.
> 
> As the culprit I have identified the following device:
> 
> ugen0.6: <vendor 0x8087 product 0x07dc> at usbus0, cfg=255 md=HOST spd=FULL (12Mbps) pwr=ON (100mA)
> 
> …

The device spamms me with interrupts after every boot and resume
until I send it a power_off command.

For anyone else with a similar problem, I'm using the following devd
rule to mitigate the issue (https://pastebin.com/raw/HmDur3Le):

notify 100 {
	match "system"		"USB";
	match "subsystem"	"INTERFACE";
	match "type"		"ATTACH";
	match "vendor"		"0x8087";
	match "product"		"0x07dc";
	action "usbconfig -d $cdev power_off";
};

-- 
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