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From: Zaphod Beeblebrox <zbeeble@gmail.com>
Date: Tue, 27 Sep 2016 19:24:05 -0400
Message-ID: <CACpH0Mc7GLk+ggA3_A_8O_MX5fi+-YtFfp-1GUTkOum12Omahg@mail.gmail.com>
Subject: Logitech G510s keyboard fail.
To: FreeBSD Hackers <freebsd-hackers@freebsd.org>
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So... The Logitech G510 keyboard fails.  It is one of the Logitech
keyboards with the small display incorporated in it...

when I attache it, I get the following dmesg:

ukbd2: <Logitech G510s Gaming Keyboard, class 0/0, rev 2.00/11.72, addr 10>
on usbus0
kbd4 at ukbd2
hid_get_item: Number of items(991) truncated to 255
hid_get_item: Number of items(257) truncated to 255
hid_get_item: Number of items(991) truncated to 255
hid_get_item: Number of items(257) truncated to 255
uhid1: <Logitech G510s Gaming Keyboard, class 0/0, rev 2.00/11.72, addr 10>
on usbus0
hid_get_item: Number of items(991) truncated to 255
hid_get_item: Number of items(257) truncated to 255
hid_get_item: Number of items(991) truncated to 255
hid_get_item: Number of items(257) truncated to 255
hid_get_item: Number of items(991) truncated to 255
hid_get_item: Number of items(257) truncated to 255

2:27:327]root@hit:/home/dgilbert/Downloads> usbconfig -d ugen0.5
dump_device_desc
ugen0.5: <G510s Gaming Keyboard Logitech> at usbus0, cfg=0 md=HOST spd=FULL
(12Mbps) pwr=ON (500mA)

  bLength = 0x0012
  bDescriptorType = 0x0001
  bcdUSB = 0x0200
  bDeviceClass = 0x0000  <Probed by interface class>
  bDeviceSubClass = 0x0000
  bDeviceProtocol = 0x0000
  bMaxPacketSize0 = 0x0008
  idVendor = 0x046d
  idProduct = 0xc22d
  bcdDevice = 0x1172
  iManufacturer = 0x0001  <Logitech>
  iProduct = 0x0002  <G510s Gaming Keyboard>
  iSerialNumber = 0x0000  <no string>
  bNumConfigurations = 0x0001

... notably, it works under BIOS and (of course) windows.