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Old 11-30-2017, 05:53 AM   #121
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Registered: Nov 2017
Posts: 5

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Originally Posted by bbaker6212 View Post
@ibart / @mogio, have a look at this. The date is recent and this dev is the same guy I think that made the previous patch and here he is talking a lot about left-button click. Maybe this patch can fix the touchpad click problem? I think one problem may be that the touchpad maker being used is different between our notebooks and/or maybe I have the same touchpad but it's being treated different due to my different BIOS version? How can we identify if our touchpads are exactly the same ones or different?
Also you can see HERE that this guy is doing a lot of work on the touchpad driver.


Hans de Goede - Nov. 22, 2017, 11:57 a.m.
According to the Win8 Precision Touchpad spec, inside the HID_UP_BUTTON
usage-page usage 1 is for a clickpad getting clicked, 2 for an external
left button and 3 for an external right button. Since Linux uses
BTN_LEFT for a clickpad being clicked we end up mapping both usage 1
and 2 to BTN_LEFT and if a single report contains both then we ended
up always reporting the value of both in a single SYN, e.g. :
BTN_LEFT 1, BTN_LEFT 0, SYN. This happens for example with Hantick
HTT5288 i2c mt touchpads.

This commit fixes this by not immediately reporting left button when we
parse the report, but instead storing or-ing together the values and
reporting the result from mt_sync_frame() when we've a complete frame.

Signed-off-by: Hans de Goede <>
Reviewed-by: Benjamin Tissoires <>
Changes in v2:
-Rewrite of v1 of "HID: multitouch: Fix BTN_LEFT 0-1-0-1 events on Novatek
mt touchpad" to kill two birds with one stone

Changes in v3:
-Delay reporting for all buttons not just for BTN_LEFT

Changes in v4:
-Back to combining only the value for BTN_LEFT, the other issues are fixed
with the new "HID: multitouch: Only look at non touch fields in first
packet of a frame" patch
drivers/hid/hid-multitouch.c | 20 ++++++++++++++++++++
1 file changed, 20 insertions(+)

Yeah, Hans de Goede is very kind. I mailed him, he replied but his patches don't solve the problem at all.


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