linux-kernel - Re: [PATCH] Add a quirk for the Dell XPS 13 (2015) when in PS/2 mode.

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Date:	Wed, 25 Feb 2015 12:26:18 -0600
From:	Mario Limonciello <mario_limonciello@...l.com>
To:	Dmitry Torokhov <dmitry.torokhov@...il.com>,
	Pali Rohár 
	<pali.rohar@...il.com>
CC:	LKML <linux-kernel@...r.kernel.org>,
	"linux-input@...r.kernel.org" <linux-input@...r.kernel.org>,
	Rob <robr.bensson@...il.com>
Subject: Re: [PATCH] Add a quirk for the Dell XPS 13 (2015) when in PS/2 mode.


On 02/23/2015 06:51 PM, Dmitry Torokhov wrote:
> On Sun, Feb 22, 2015 at 05:55:05PM +0100, Pali Rohár wrote:
> I am not sure what exactly the issue is... We do need to have the break
> code to know when the key is released. We can't go and say that we will
> release old key when we detect another key press as that would mess up
> key combination handling (like control, meta, etc).
>
> What does Windows driver do?
>
> Thanks.
>
To me it sounds like the Windows driver understands a situation that there are a bunch of key down events without a keyup event until you lift your finger rather than expecting a pair every time.
https://msdn.microsoft.com/en-us/library/windows/desktop/ms646267(v=vs.85).aspx

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