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

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Date:	Wed, 6 Nov 2013 09:44:11 +0800
From:	AceLan Kao <acelan.kao@...onical.com>
To:	Jiri Kosina <jkosina@...e.cz>
Cc:	Nikolai Kondrashov <spbnick@...il.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)

Hi,

Sorry, no thoughts about this.
If Kevin would like to try, I can bisect the kernel and build the
Ubuntu .deb package for him.
But like I say above, those 4 commits doesn't look like to lead to the
problem, so I'll try to bisect the whole kernel.

% git bisect start v3.12-rc7 v3.12-rc6
Bisecting: 165 revisions left to test after this (roughly 7 steps)
[edd31476011052d8f6591a3194ba0716b0cea681] bnx2x: Set NETIF_F_HIGHDMA
unconditionally

Best regards,
AceLan Kao.

2013/11/5 Jiri Kosina <jkosina@...e.cz>:
> 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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