Re: [PATCH] HID: sensor-hub: Add quirk for Lenovo Yoga 900 with ITE Chips

[Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com>]

On Fri, 2015-12-18 at 22:31 -0800, Nish Aravamudan wrote:
> On Fri, Dec 18, 2015 at 10:34 AM, Srinivas Pandruvada
> <srinivas.pandruvada@linux.intel.com> wrote:
> > This needs same quirk as applied to other YOGA sensor hubs.
> > Refer to
> > 47eeca8a48 (" HID: sensor-hub: Add in quirk for Lenovo Yogas with
> > ITE")
> > 
> > Signed-off-by: Srinivas Pandruvada <
> > srinivas.pandruvada@linux.intel.com>
> > Tested-by: Nishanth Aravamudan <nish.aravamudan@gmail.com>
> 
> Ok, maybe I spoke too soon! It did work once, at least. But since
> then
> it seems to have stopped working again? 

This patch is still relevant like other YOGAs. Can you try different
motions like quick movements with jerk?

> That is, the *raw* files are
> still working, but iio-sensor-proxy is again not seeing any updates
> via the chardev(s). Any notion of what might be going on?
> 
> Note that dmesg does contain (it always has):
> 
> i2c_hid i2c-ITE8396:00: error in i2c_hid_init_report size:19 /
> ret_size:18

We have to enable debug in the i2c-hid driver and see if this device
getting powered off. You can google i2c-hid specification from
Microsoft to get details about the protocol.

Thanks,
Srinivas

> but I have no idea if that's relevant to the IIO sensors? I was told
> in another thread that it shouldn't have any negative consequence.
> -Nish