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

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Date:	Tue, 29 Oct 2013 08:33:39 -0400
From:	Josh Boyer <jwboyer@...oraproject.org>
To:	Kevin Fenzi <kevin@...ye.com>
Cc:	"Linux-Kernel@...r. Kernel. Org" <linux-kernel@...r.kernel.org>,
	AceLan Kao <acelan.kao@...onical.com>,
	Jiri Kosina <jkosina@...e.cz>
Subject: Re: ELAN Touchscreen regression in recent 3.12 rc's? (USB)

On Mon, Oct 28, 2013 at 5:02 PM, Kevin Fenzi <kevin@...ye.com> wrote:
> Greetings.
>
> I have a lenovo yoga 2 pro.. it has a ELAN Touchscreen.
>
> In 3.12rc5 it was detected and works.
> in 3.12rc6 it was detected and works.
>
> Sometime after the rc6 timeframe it stopped working. It doesn't work with
> rc7.
>
> In dmesg I get:
>
> [  159.519663] usb 2-7: New USB device found, idVendor=04f3, idProduct=016f
> [  159.519681] usb 2-7: New USB device strings: Mfr=4, Product=14, SerialNumber=0
> [  159.519683] usb 2-7: Product: Touchscreen
> [  159.519685] usb 2-7: Manufacturer: ELAN
> [  159.519901] usb 2-7: ep 0x2 - rounding interval to 64 microframes, ep desc says 80 microframes
> [  159.528027] input: ELAN Touchscreen as /devices/pci0000:00/0000:00:14.0/usb2/2-7/2-7:1.0/input/input20
> [  159.528544] hid-multitouch 0003:04F3:016F.000A: input,hiddev0,hidraw1: USB HID v1.10 Device [ELAN Touchscreen] on usb-0000:00:14.0-7/input0
> [  161.601423] usb 2-7: USB disconnect, device number 71
> [  161.896828] usb 2-7: new full-speed USB device number 72 using xhci_hcd
> [  163.991296] usb 2-7: unable to read config index 0 descriptor/start: -71
> [  163.991301] usb 2-7: can't read configurations, error -71
> [  164.143686] usb 2-7: new full-speed USB device number 73 using xhci_hcd
> [  166.239273] usb 2-7: unable to read config index 0 descriptor/start: -71
> [  166.239278] usb 2-7: can't read configurations, error -71
> [  166.392576] usb 2-7: new full-speed USB device number 74 using xhci_hcd
> [  168.487051] usb 2-7: unable to read config index 0 descriptor/start: -71
> [  168.487058] usb 2-7: can't read configurations, error -71
> [  168.640308] usb 2-7: new full-speed USB device number 75 using xhci_hcd
> [  170.734850] usb 2-7: unable to read config index 0 descriptor/start: -71
> [  170.734856] usb 2-7: can't read configurations, error -71
> [  170.734927] hub 2-0:1.0: unable to enumerate USB device on port 7
> [  171.022134] usb 2-7: new full-speed USB device number 76 using xhci_hcd
> [  173.116744] usb 2-7: unable to read config index 0 descriptor/start: -71
> [  173.116750] usb 2-7: can't read configurations, error -71
> [  173.269840] usb 2-7: new full-speed USB device number 77 using xhci_hcd
> [  173.282520] usb 2-7: New USB device found, idVendor=04f3, idProduct=016f
> [  173.282526] usb 2-7: New USB device strings: Mfr=4, Product=14, SerialNumber=0
> [  173.282528] usb 2-7: Product: Touchscreen
> [  173.282530] usb 2-7: Manufacturer: ELAN
> [  173.282782] usb 2-7: ep 0x2 - rounding interval to 64 microframes, ep desc says 80 microframes
> [  173.290920] input: ELAN Touchscreen
> as /devices/pci0000:00/0000:00:14.0/usb2/2-7/2-7:1.0/input/input21
>
> So it seems to be bouncing in and out (but never long enough to actually work).
>
> Could be a regression in xhci_hcd?

Hm.  There were no changes in drivers/usb from -rc6 to -rc7, so if
-rc6 works then I doubt it's xhci_hcd.  There were two touchscreen
quirks added between those two rcs though, so perhaps one of those
broke this.

684524d35fe8d13be1f2649633e43bd02c96c695 HID: usbhid: quirk for SiS Touchscreen
8171a67d587a09e14a4949a81e070345fedcf410 HID: usbhid: quirk for
Synaptics Large Touchccreen

CC'd AceLan and Jiri.

josh
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