I found the bad commit.

git bisect gave me the following:

--------------------------
ab94e562ed45c99914fe874b7feaf75b80ceea84 is the first bad commit
commit ab94e562ed45c99914fe874b7feaf75b80ceea84
Author: Benjamin Tissoires <benjamin.tissoi...@redhat.com>
Date:   Tue Sep 30 13:18:28 2014 -0400

    HID: logitech: move dj devices to the HID++ module

    Devices connected through the Logitech Wireless Receiver are HID++
devices.
    We can handle them here to benefit from this new module and activate
    enhaced support of the various wireless touchpad or mice with touch
    sensors on them.

    Signed-off-by: Benjamin Tissoires <benjamin.tissoi...@redhat.com>
    Tested-by: Andrew de los Reyes <a...@chromium.org>
    Signed-off-by: Jiri Kosina <jkos...@suse.cz>

:040000 040000 d6253d6fe42eba7b80315a2a8a5974afd1d07fa8
c135f1f4cb14cdc5f43595481bfc44f6b074fc45 M      drivers
--------------------------

So should I do anything else now, liek pos this info on:
https://bugzilla.kernel.org/show_bug.cgi?id=100631
where I first reported it.

And Is there a way I can track the progres sof this bug?

(First time reporting a kernel bug for me)



Op 01-07-15 om 16:17 schreef Alan Stern:
> 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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