Comment 127 for bug 1651635

> On 2 Nov 2017, at 5:40 PM, Paul Menzel <email address hidden> wrote:
>
> @kaihengfeng, I am quite surprised and even angry about your comment.
My apology.

>
> 1. How do you know it’s a Linux kernel issue?
I don’t. But it’s better to get input from upstream maintainer.

> Even if it were, the shipped Linux kernel with Ubuntu 16.04 is far too old, and Linux upstream doesn’t care about old Linux kernel.
It also happens on upstream Linux kernel.

> 2. We bought the system from Dell with Ubuntu. As far as I know, they contract Canonical to do the port. That’s the company you work for.
That’s correct.

> 3. So why do you ask the reporters, which wasted too much time already experiencing this bug, to report it, and to test your suggestions to open a bug report upstream. If this is the next step, I kindly ask *you* or some of your colleagues at Canonical to do that.
Well, I help public issues when I have spare time, this one included. I personally also invested some time trying to reproduce the bug.
Anyway, I’ll file an upstream bug then.

>
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> Sputnik.
> https://bugs.launchpad.net/bugs/1651635
>
> Title:
> XPS 13 9360 trackpad locks into scroll mode
>
> Status in Dell Sputnik:
> Confirmed
>
> Bug description:
> Hello,
>
> I'm running Linux on a Dell XPS 13 (9360) laptop.
>
> I find that upwards of 10 times per day, my trackpad gets stuck in
> "scrolling" mode. Moving the trackpad won't move the X windows
> pointer, but will send scrolling events to the foreground window.
>
> When the trackpad is locked in this mode, the touchscreen will still
> let me move the mouse cursor, as will an external mouse.
>
> On Ubuntu 16.04 freshly restored from the Dell recovery image, I find
> that it's often difficult to get the trackpad to recover.
>
> I do find that the issue happens less frequently on Dell's build of
> Ubuntu 16.04 than on other linux distributions and versions, but it
> still happens enough to significantly impact my ability to do
> productive work.
>
> The issue does not occur when running Windows 10 on the same device.
>
> I suspect that the issue may be related to palm detection or
> misdetecting the user's palm as a gesture to enable scrolling mode,
> but have no proof for this.
>
> It seems that I'm often able to reproduce the issue by brushing the
> trackpad with my right palm.
>
> On Ubuntu 16.10, with the latest shipped 4.8 kernel (Linux szx
> 4.8.0-30-generic #32-Ubuntu SMP Fri Dec 2 03:43:27 UTC 2016 x86_64
> x86_64 x86_64 GNU/Linux), with the extra xinput configuration below, I
> am able to get the trackpad to recover, simply by clicking the
> trackpad:
>
> /usr/share/X11/xorg.conf.d/99-libinput.conf:
>
> Section "InputClass"
> Identifier "libinput touchpad catchall"
> Driver "libinput"
> MatchIsTouchpad "on"
> MatchDevicePath "/dev/input/event*"
> Option "Tapping" "True"
> Option "DisableWhileTyping" "True"
> Option "NaturalScrolling" "False"
> Option "AccelProfile" "adaptive"
> Option "AccelSpeed" "0.05"
> Option "MiddleEmulation" "True"
> Option "ScrollMethod" "twofinger"
> # Option "ClickMethod" "clickfinger"
> Option "ClickMethod" "buttonareas"
> EndSection
>
>
> In my experience, the problem manifests using both the Xorg synaptics driver and the Xorg libinput driver.
>
> root@szx:/etc/modprobe.d# xinput list
> ⎡ Virtual core pointer id=2 [master pointer (3)]
> ⎜ ↳ Virtual core XTEST pointer id=4 [slave pointer (2)]
> ⎜ ↳ Logitech M570 id=10 [slave pointer (2)]
> ⎜ ↳ DLL075B:01 06CB:76AF Touchpad id=13 [slave pointer (2)]
> ⎜ ↳ ELAN Touchscreen id=11 [slave pointer (2)]
> ⎣ Virtual core keyboard id=3 [master keyboard (2)]
> ↳ Virtual core XTEST keyboard id=5 [slave keyboard (3)]
> ↳ Power Button id=6 [slave keyboard (3)]
> ↳ Video Bus id=7 [slave keyboard (3)]
> ↳ Power Button id=8 [slave keyboard (3)]
> ↳ Sleep Button id=9 [slave keyboard (3)]
> ↳ Integrated_Webcam_HD id=12 [slave keyboard (3)]
> ↳ Intel Virtual Button driver id=14 [slave keyboard (3)]
> ↳ Intel HID events id=15 [slave keyboard (3)]
> ↳ AT Translated Set 2 keyboard id=16 [slave keyboard (3)]
> ↳ Dell WMI hotkeys id=17 [slave keyboard (3)]
> root@szx:/etc/modprobe.d#
>
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