On Thu, Mar 17, 2016 at 11:43 AM, Andy Lutomirski [off-list ref] wrote:

On Thu, Mar 17, 2016 at 1:06 AM, Mika Westerberg
[off-list ref] wrote:

quoted

On Wed, Mar 16, 2016 at 02:59:48PM -0700, Andy Lutomirski wrote:

quoted

[add i2c-designware maintainers]

On Wed, Mar 16, 2016 at 1:47 AM, Benjamin Tissoires [off-list ref] wrote:

quoted

Hi Andy,

On Mar 15 2016 or thereabouts, Andy Lutomirski wrote:

quoted

Hi-

In 4.5 and several 4.5 rcs, I see occasional stuck taps (I think) on
my XPS 13 9350's touchpad.  The effect is that trying to left-click
ends up middle-clicking.  I think it's a kernel issue and not a
hardware or libinput issue, but I'm not 100% sure.  I don't think I
had this issue in 4.4.

I've attached what I think is an evtest issue of my fixing the issue
by pressing three fingers down in sequence and then releasing them.
After doing that, left-clicks worked.

I think I already have been reported the issue here:
https://bugs.freedesktop.org/show_bug.cgi?id=93948

The result was that it was more likely an I2C transport bug than a
hid-multitouch one (see comment #8 in the fdo bug).

You can try to run hid-recorder when you see the problems, and then
parse the output (or just send it to me). There is huge chances that
there will be no events from I2C sending the release.

And again, I am not sure how we could end up debugging this in the
i2c-designware driver :(

Does this ring a bell?

i2c-designware usually prints errors to dmesg if it fails to transfer
messages. Can you include dmesg of the failure as well?

Nothing shows up at all.  All I have is:

input: DLL0704:01 06CB:76AE Touchpad as
/devices/pci0000:00/0000:00:15.1/i2c_designware.1/i2c-7/i2c-DLL0704:01/0018:06CB:76AE.0001/input/input12

What is the fw id? I have a 9343 with the same touchpad and have not
noticed an issue. This is the dmesg output for my touchpad.

[    5.216319] psmouse serio1: synaptics: Touchpad model: 1, fw: 8.1,
id: 0x1e2b1, caps: 0xd00123/0x840300/0x12e800/0x0, board id: 3038, fw
id: 1832324

If we have the same firmware version then we can eliminate that as a factor.

--
To unsubscribe from this list: send the line "unsubscribe linux-input" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html