linux-kernel - Re: ELAN Touchscreen regression in recent 3.12 rc's? (USB)

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Message-ID: <alpine.LNX.2.00.1311051051590.2779@pobox.suse.cz>
Date:	Tue, 5 Nov 2013 10:52:11 +0100 (CET)
From:	Jiri Kosina <jkosina@...e.cz>
To:	Nikolai Kondrashov <spbnick@...il.com>
Cc:	AceLan Kao <acelan.kao@...onical.com>,
	Josh Boyer <jwboyer@...oraproject.org>,
	Kevin Fenzi <kevin@...ye.com>,
	"Linux-Kernel@...r. Kernel. Org" <linux-kernel@...r.kernel.org>
Subject: Re: ELAN Touchscreen regression in recent 3.12 rc's? (USB)

On Wed, 30 Oct 2013, Nikolai Kondrashov wrote:

> > It's hard to believe that those quirks will lead to the problem.
> > And actually, there are 4 new commits introduced to -rc7, and 3 of
> > them are quirks.
> > 
> > % git log --pretty=oneline v3.12-rc6..v3.12-rc7 drivers/hid
> > 86b84167d4e67372376a57ea9955c5d53dae232f HID: wiimote: add LEGO-wiimote VID
> > ad0e669b922c7790182cf19f8015b30e23ad9499 HID: Fix unit exponent parsing
> > again
> > 684524d35fe8d13be1f2649633e43bd02c96c695 HID: usbhid: quirk for SiS
> > Touchscreen
> > 8171a67d587a09e14a4949a81e070345fedcf410 HID: usbhid: quirk for
> > Synaptics Large Touchccreen
> > 
> > CC'd Nikolai, since his commit changes the protocol.
> 
> My change is very unlikely to produce such problems. It changes calculation of
> axes resolution at the time the report descriptor is processed. The results of
> the calculation are not used by the kernel, AFAIK, but only by userspace
> drivers. The results should not be used to affect the interactions with the
> device, but only the interpretation of the reports (again, in userspace), and
> even that is barely done currently.
> 
> Please try reverting that particular commit and see if it affects the
> behavior.

AceLan,

do you have any update, please?

-- 
Jiri Kosina
SUSE Labs
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