edge scrolling not working correctly on latitude e6410

[Sebastien Bacher]

The output from touchpad-edge-detector

Touchpad AlpsPS/2 ALPS DualPoint TouchPad on /dev/input/event7
Move one finger around the touchpad to detect the actual edges
Kernel says: x [0..2000], y [0..1400]
Touchpad sends: x [92..1837], y [113..1308] \^C

Touchpad has no resolution, size unknown
Calculate resolution as:
 x axis: 2000/<width in mm>
 y axis: 1400/<height in mm>

Suggested udev rule:
# <Laptop model description goes here>
evdev:name:AlpsPS/2 ALPS DualPoint TouchPad:dmi:bvnDellInc.:bvrA14:bd04/21/2013:svnDellInc.:pnLatitudeE6410:pvr0001:rvnDellInc.:rn0HNGW4:rvr:cvnDellInc.:ct9:cvr:*
 EVDEV_ABS_00=92:1837:<x resolution>
 EVDEV_ABS_01=113:1308:<y resolution>
 EVDEV_ABS_35=92:1837:<x resolution>
 EVDEV_ABS_36=113:1308:<y resolution>

[Sebastien Bacher (seb128)]

touchpad dimensions are 66x38

[Sebastien Bacher (seb128)]

the range changes slightly between tries, got that on another one

Touchpad sends: x [70..1862], y [106..1308]

[Timo Aaltonen (tjaalton)]

Yeah, so testing with values that are somewhat rounded nicely would be the next step.

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.

[penalvch (penalvch)]

Sebastien Bacher, thank you for reporting this and helping make Ubuntu better.

Could you please run the following command once from a terminal by ensuring you have the package xdiagnose installed, and that you click the Yes button for attaching additional debugging information:
apport-collect 1526633

[Launchpad Janitor (janitor)]

[Expired for libinput (Ubuntu) because there has been no activity for 60 days.]

[Yuan-Chen Cheng (ycheng-twn)]

@seb, can you try to add Option "ScrollMethod" "edge" to the libinput xorg driver, and check if edge scrolling work or not. like what I have below. (you will also like Tapping on to enable two finger tap.)

Section "InputClass"
        Identifier "libinput touchpad catchall"
        MatchIsTouchpad "on"
        MatchDevicePath "/dev/input/event*"
        Driver "libinput"
        Option "Tapping" "on"
        Option "ScrollMethod" "edge"
EndSection

[Yuan-Chen Cheng (ycheng-twn)]

ref: https://bbs.archlinux.org/viewtopic.php?id=210096

it seems two finger scrolling and edge scrolling is two exclusive option in libinput xorg driver.

[Yuan-Chen Cheng (ycheng-twn)]

since we decide not to move to libinput in xenial, remove this from oem-priority.