linux-kernel - Re: [PATCH] Input: synaptics - disable fuzz when using mt slots

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Message-ID: <20130214172243.GB538@polaris.bitmath.org>
Date:	Thu, 14 Feb 2013 18:22:43 +0100
From:	"Henrik Rydberg" <rydberg@...omail.se>
To:	Daniel Kurtz <djkurtz@...omium.org>
Cc:	Dmitry Torokhov <dmitry.torokhov@...il.com>,
	Seth Forshee <seth.forshee@...onical.com>,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	Chung-Yih Wang <cywang@...omium.org>,
	Chase Douglas <chase.douglas@...onical.com>,
	linux-input@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] Input: synaptics - disable fuzz when using mt slots

> > Hmm, instead of disabling fuzz completely maybe we should disable it
> > only on the derived axes (ABS_X/ABS_Y) for multitouch devices?
> 
> Yes, that should work...  both would end up fuzzed to the same value,
> for a not-so-obvious reason, IMHO :).
> It's a bit tricky, and I like it, but is that what you intended by the
> suggestion?

Since this is inherently a problem when using the mt helper functions,
turning fuzz off there ought to solve this problem transparently, and
for all users.

Thanks, Daniel, for reminding me of this year-old glitch. :-)

Henrik
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