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My Corsair K-50 stopped working on the 27th June, had been working
perfectly fine for the last few months. I plugged it into another
machine on ubuntu that has been recently updated which leads me to
believe this is a bug.

Furthermore the keyboard works fine in BIOS, setup and even in the
Advanced settings - I can select recovery mode, but as soon as that
finishes the keyboard stops working.

I have also plugged it into a Windows machine and the keyboard works
fine.

Not sure if these files will help but here's what I have found:

http://pastebin.com/uzSCh8bM - this is a log from the previous boot on
the 25th June, on line 1185 the keyboard is registered and detected as
the correct make and model.

http://pastebin.com/NJEZ8YYt - this is a log from the day it stopped
working and there is no trace of "Corsair" , instead at roughly the same
time I find the lines on line (1133):

Jun 27 02:53:15 jared-MS-7930 kernel: [    1.153217] usbhid 1-2:1.0: can't add hid device: -22
Jun 27 02:53:15 jared-MS-7930 kernel: [    1.153221] usbhid: probe of 1-2:1.0 failed with error -22

This error crops up a number of times but I can find little reference to
it on the web.

Here is an up to date log of me removing my mouse (which works) and plugging the keyboard into the same port:
Jul  3 20:08:33 jared-MS-7930 kernel: [66429.129176] usb 1-14: USB disconnect, device number 8
Jul  3 20:08:53 jared-MS-7930 kernel: [66449.334761] usb 1-14: new full-speed USB device number 9 using xhci_hcd
Jul  3 20:08:53 jared-MS-7930 kernel: [66449.463930] usb 1-14: New USB device found, idVendor=1b1c, idProduct=1b04
Jul  3 20:08:53 jared-MS-7930 kernel: [66449.463932] usb 1-14: New USB device strings: Mfr=1, Product=2, SerialNumber=0
Jul  3 20:08:53 jared-MS-7930 kernel: [66449.463933] usb 1-14: Product: KBD Boot Loader
Jul  3 20:08:53 jared-MS-7930 kernel: [66449.463934] usb 1-14: Manufacturer: EST
Jul  3 20:08:53 jared-MS-7930 kernel: [66449.464411] usbhid 1-14:1.0: can't add hid device: -22
Jul  3 20:08:53 jared-MS-7930 kernel: [66449.464416] usbhid: probe of 1-14:1.0 failed with error -22

I've checked the Software Centre History and hadn't updated since the 24th the only packages being:
google-chrome-stable (43.0.2357.125-1, 43.0.2357.130-1)
flashplugin-installer (11.2.202.466ubuntu0.15.04.1, 11.2.202.468ubuntu0.15.04.1)

I understand that this is difficult to reproduce because you require the
specific keyboard but I'm willing to dig and investigate if needed.

** Affects: linux (Ubuntu)
     Importance: Undecided
         Status: New

-- 
ubuntu doesn't recognise keyboard - works fine in BIOS, stops on OS load
https://bugs.launchpad.net/bugs/1471327
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