The "Charm" keys seem to issue short-cut key combinations.
I also found Microsoft's document by searching for the combinations.

So the behavior of hid-multitouch is completely fine.

On 12/18/2015 03:28 PM, Akihiko Odaki wrote:
>> The search, share, connect(?), and settings keys
> I tested the patch again with xev and found that those "charm"
> keys don't respond both on hid-microsoft and hid-multitouch, while
> other keys respond. I'll have a further look.
> Anyway, keys working with hid-microsoft also work with
> hid-multitouch, so It's ready for merging, I think.
> On 12/15/2015 01:39 AM, Donavan Lance wrote:
>> On Mon, Dec 14, 2015 at 8:22 AM, Bastien Nocera 
>> <>
> wrote:
>>> On Mon, 2015-12-14 at 21:50 +0900, Akihiko Odaki wrote:
>>>> Use multitouch driver instead of microsoft one for Microsoft 
>>>> Surface Type Covers.
>>>> By using MT_CLS_EXPORT_ALL_INPUTS, the keyboards function as 
>>>> well as the multitouch pads do.
>>> I've discussed this a couple of weeks back with Benjamin 
>>> Tissoires, and this patch would break the special keys (mute, 
>>> brightness up/down, keyboard backlight up/down and
>>> play/pause).
>>> The recommended way to fix this was to move multi-touch 
>>> processing into the Microsoft driver, so that it would handle
>>> the trackpad's multi- touch events.
>>> You should be able to do this by carefully picking up the 
>>> handling code from hid-multitouch, or do something similar to 
>>> what's done in hid- wacom, which has the same problem as the
>>> Type Cover handling.
>>> Can you confirm that this does indeed break those special
>>> keys? If it does, it's a NAK from my side.
>> For what it's worth the special keys on my keyboard work fine
>> when using this patch. I'm using a Surface Pro 3, Type Cover 3,
>> running GNOME and Fedora 23. The search, share, connect(?), and
>> settings keys are the only ones not mapped to anything out of the
>> box, but they are recognized by xev.
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