[Bug 183478] x11-servers/xorg-server: DEVD backend is broken, here's a fix

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=183478

--- Comment #7 from Henry Hu <henry.hu.sh at gmail.com> ---
> sudo usbconfig -d 2.3 dump_device_desc
No device match or lack of permissions.
> sudo usbconfig -d 0.3 dump_device_desc
ugen0.3: <USB Receiver Logitech> at usbus0, cfg=0 md=HOST spd=FULL (12Mbps)
pwr=ON (98mA)

  bLength = 0x0012 
  bDescriptorType = 0x0001 
  bcdUSB = 0x0200 
  bDeviceClass = 0x0000 
  bDeviceSubClass = 0x0000 
  bDeviceProtocol = 0x0000 
  bMaxPacketSize0 = 0x0008 
  idVendor = 0x046d 
  idProduct = 0xc52b 
  bcdDevice = 0x1201 
  iManufacturer = 0x0001  <Logitech>
  iProduct = 0x0002  <USB Receiver>
  iSerialNumber = 0x0000  <no string>
  bNumConfigurations = 0x0001 

> usbconfig
ugen0.1: <XHCI root HUB 0x8086> at usbus0, cfg=0 md=HOST spd=SUPER (5.0Gbps)
pwr=SAVE (0mA)
ugen1.1: <EHCI root HUB Intel> at usbus1, cfg=0 md=HOST spd=HIGH (480Mbps)
pwr=SAVE (0mA)
ugen2.1: <EHCI root HUB Intel> at usbus2, cfg=0 md=HOST spd=HIGH (480Mbps)
pwr=SAVE (0mA)
ugen0.2: <USB2.0 Hub vendor 0x05e3> at usbus0, cfg=0 md=HOST spd=HIGH (480Mbps)
pwr=SAVE (100mA)
ugen1.2: <product 0x0024 vendor 0x8087> at usbus1, cfg=0 md=HOST spd=HIGH
(480Mbps) pwr=SAVE (0mA)
ugen2.2: <product 0x0024 vendor 0x8087> at usbus2, cfg=0 md=HOST spd=HIGH
(480Mbps) pwr=SAVE (0mA)
ugen0.4: <USB Keyboard vendor 0x04d9> at usbus0, cfg=0 md=HOST spd=LOW
(1.5Mbps) pwr=ON (100mA)
ugen1.3: <product 0x07da vendor 0x8087> at usbus1, cfg=0 md=HOST spd=FULL
(12Mbps) pwr=ON (0mA)
ugen0.5: <PCTV 801e SE YUANRD> at usbus0, cfg=0 md=HOST spd=HIGH (480Mbps)
pwr=ON (500mA)
ugen1.4: <USB2.0 HD UVC WebCam Chicony Electronics Co.,Ltd.> at usbus1, cfg=0
md=HOST spd=HIGH (480Mbps) pwr=ON (500mA)
ugen0.6: <My Passport 0820 Western Digital> at usbus0, cfg=0 md=HOST spd=HIGH
(480Mbps) pwr=ON (500mA)
ugen0.3: <USB Receiver Logitech> at usbus0, cfg=0 md=HOST spd=FULL (12Mbps)
pwr=ON (98mA)
ugen0.7: <Mass Storage USB> at usbus0, cfg=0 md=HOST spd=HIGH (480Mbps) pwr=ON
(200mA)

It seems like that usbus is always correct.

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