Re: [RESEND] Lenovo Yoga 900 touchpad issues

[Nish Aravamudan]

On Wed, Dec 16, 2015 at 1:28 AM, Mika Westerberg
<mika.westerberg@xxxxxxxxxxxxxxx> wrote:
> On Tue, Dec 15, 2015 at 11:14:32AM -0800, Nish Aravamudan wrote:
>> [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?).
>
> Linus noticed this as well and Jiri suggested the below patch which
> seemed to fix the issue (although it increased resume time a bit).
>
> I was supposed to get one Lenovo Yoga 900 here to debug this issue but
> I'm still waiting for it (sloow big corporation bureaucracy takes some
> time to get things purchased outside).

With the patch applied to my patched 4.4-rc5, things seem to be
working now. I do get one "failed to reset device" message in the
logs, but then I'm guessing the second one succeeds and I don't see
the "failed to resume" message.

-Nish
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