linux-kernel - Re: [git pull] Input updates for 2.6.35-rc0

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Message-ID: <alpine.LFD.2.00.1005271837050.11382@i5.linux-foundation.org>
Date:	Thu, 27 May 2010 18:53:20 -0700 (PDT)
From:	Linus Torvalds <torvalds@...ux-foundation.org>
To:	Dmitry Torokhov <dmitry.torokhov@...il.com>,
	Florian Ragwitz <rafl@...ian.org>,
	Arjan Opmeer <arjan@...eer.net>,
	Eric Piel <eric.piel@...mplin-utc.net>
cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	linux-input@...r.kernel.org
Subject: Re: [git pull] Input updates for 2.6.35-rc0

On Thu, 20 May 2010, Dmitry Torokhov wrote:
> 
> Dmitry Torokhov (17):
>       Input: elantech - enforce common prefix on messages
>       Input: elantech - relax signature checks

These two commits (I _think_ - I didn't actually bisect it) seem to result 
in a Dell Inspiron bootup message changing from:

	input: ImPS/2 Logitech Wheel Mouse as /devices/platform/i8042/serio1/input/input5

to

	elantech: assuming hardware version 2, firmware version 4.3.1
	elantech: Synaptics capabilities query result 0x08, 0x18, 0x0c.
	input: ETPS/2 Elantech Touchpad as /devices/platform/i8042/serio1/input/input5

and the end result is a total disaster. In the words of my daughter, whose 
laptop this is:

	Subject: Computer=awful

	I am not able to click by tapping, I actually have to press down.. It's
	really frustrating and I want it fixed.

and having tested it, I have to agree. It's beyond awful. It's absolutely 
disgusting, and the touchpad went from "quite usable" (with tapping, 
double-tapping, scroll-wheel on the right side etc) to "totally unusable". 
The buttons you have to press (since tapping doesn't work) are on the 
touch-pad itself, and it's basically a total pain.

The scroll-wheel emulation still seems to work, but tapping has gone away. 
I'm reading the docs, and they say that you can do magic things with the 
raw registers, but if I'm looking at the register contents they seem to 
say that tapping _is_ enabled. It just doesn't work.

So it would seem that the "non-native" PS/2 emulation of that thing is way 
better than the native driver, and we should _not_ try to treat it as a 
touchpad. We're better off leaving it in ImPS/2 mode.

		Linus
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