linux-kernel - [RESEND] Lenovo Yoga 900 touchpad issues

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Date:	Tue, 15 Dec 2015 11:14:32 -0800
From:	Nish Aravamudan <nish.aravamudan@...il.com>
To:	Jiri Kosina <jikos@...nel.org>
Cc:	Benjamin Tissoires <benjamin.tissoires@...hat.com>,
	Mika Westerberg <mika.westerberg@...ux.intel.com>,
	Andrew Duggan <aduggan@...aptics.com>,
	Gabriele Mazzotta <gabriele.mzt@...il.com>,
	Seth Forshee <seth.forshee@...onical.com>,
	Dan Carpenter <dan.carpenter@...cle.com>,
	linux-input@...r.kernel.org,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: [RESEND] Lenovo Yoga 900 touchpad issues

[Apologies for the resend, didn't realize I hadn't changed my GMail settings
to not use HTML.]

I have recently purchased a Lenovo Yoga 900 and most everything is working
with a slightly modified 4.4-rc5 (https://lkml.org/lkml/2015/11/30/441 applied
to enable the touchpad itself), I am seeing two issues:

1) On suspend/resume, the touchpad is non-functional. A `modprobe -r i2c-hid;
 modprobe i2c-hid` "fixes" it.

The kernel emits:

i2c_hid i2c-SYNA2B29:00: failed to reset device.
dpm_run_callback(): i2c_hid_resume+0x0/0xc0 [i2c_hid] returns -61
PM: Device i2c-SYNA2B29:00 failed to resume: error -61

During the resume. So perhaps this is a timing issue (given that once
resumed, the
module reload does work?).

2) During boot, the following is emitted:

i2c_hid i2c-ITE8396:00: error in i2c_hid_init_report size:19 / ret_size:18

I'm not sure if this indicates a hardware or driver bug? With
i2c-hid.debug=1, I see:

i2c_hid i2c-ITE8396:00: report (len=19): 12 00 5a ff ff ff ff ff ff ff
ff ff ff ff ff ff ff ff 06
i2c_hid i2c-ITE8396:00: error in i2c_hid_init_report size:19 / ret_size:18

Any suggestions?

Thanks,
Nish
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