On Wed, 1 Jul 2015, Glasswall Information Point wrote:

> Bug as submitted on: https://bugzilla.kernel.org/show_bug.cgi?id=100631
> 
> Mailing it to this mailing list on advice of greg k-h
> 
> ------------------------------------------------------------------------------
> 
> Cannot use the logitech k520 (046d:c52b) to unlock my luks disk at boot time
> 
>  Hitting keyboard keys of this specific kayboard does not register while 
> entering the disk unlock password
> 
> In the 3.x mail line kernels this does work.
> in the 4.1 mainline kernel a corded hid keyboard does work but this specific 
> keyboard does not work anymore.
> 
> The keybaord works fine after boot

Have you tried using "git bisect" to find the kernel commit which 
caused this change in behavior?

Alan Stern

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