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

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Date:	Tue, 29 Oct 2013 19:48:13 -0600
From:	Kevin Fenzi <kevin@...ye.com>
To:	AceLan Kao <acelan.kao@...onical.com>
Cc:	Josh Boyer <jwboyer@...oraproject.org>,
	"Linux-Kernel@...r. Kernel. Org" <linux-kernel@...r.kernel.org>,
	Jiri Kosina <jkosina@...e.cz>,
	Nikolai Kondrashov <spbnick@...il.com>
Subject: Re: ELAN Touchscreen regression in recent 3.12 rc's? (USB)

On Wed, 30 Oct 2013 09:41:06 +0800
AceLan Kao <acelan.kao@...onical.com> wrote:

> Hi,
> 
> 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.

Oddly, after a while it seems to have decided to stay on: 

[ 4021.819962] usb 2-7: Manufacturer: ELAN
[ 4021.820163] usb 2-7: ep 0x2 - rounding interval to 64 microframes, ep desc says 80 microframes
[ 4021.828338] input: ELAN Touchscreen as /devices/pci0000:00/0000:00:14.0/usb2/2-7/2-7:1.0/input/input221
[ 4021.828801] hid-multitouch 0003:04F3:016F.00D3: input,hiddev0,hidraw1: USB HID v1.10 Device [ELAN Touchscreen] on usb-0000:00:14.0-7/input0
[ 4023.903599] usb 2-7: USB disconnect, device number 86
[ 4024.198444] usb 2-7: new full-speed USB device number 87 using xhci_hcd
[ 4024.211102] usb 2-7: New USB device found, idVendor=04f3, idProduct=016f
[ 4024.211143] usb 2-7: New USB device strings: Mfr=4, Product=14, SerialNumber=0
[ 4024.211177] usb 2-7: Product: Touchscreen
[ 4024.211197] usb 2-7: Manufacturer: ELAN
[ 4024.211489] usb 2-7: ep 0x2 - rounding interval to 64 microframes, ep desc says 80 microframes
[ 4024.219707] input: ELAN Touchscreen as /devices/pci0000:00/0000:00:14.0/usb2/2-7/2-7:1.0/input/input222
[ 4024.220555] hid-multitouch 0003:04F3:016F.00D4:
input,hiddev0,hidraw1: USB HID v1.10 Device [ELAN Touchscreen] on
usb-0000:00:14.0-7/input0

and it's been working since then. So, only after 87 cycles... 

Some kind of weird race condition?

kevin

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