Public bug reported:
Single touch vertical scrolling on right edge failed but success in
horizontal scrolling on bottom edge.
The way to reproduce this issue is
1. un-click "two finger scroll" and "natural scrolling" in "Mouse & Touchpad"
setting
2. open libreOffice Calc
3. touch the touchpad by single finger, then horizontal scrolling works but
vertical scrolling failed.
xinput list:
⎡ Virtual core pointer id=2 [master pointer (3)]
⎜ ↳ Virtual core XTEST pointer id=4 [slave pointer (2)]
⎜ ↳ DELL0789:00 06CB:78F6 id=11 [slave pointer (2)]
⎜ ↳ SynPS/2 Synaptics TouchPad id=14 [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 id=10 [slave keyboard (3)]
↳ Intel HID events id=12 [slave keyboard (3)]
↳ AT Translated Set 2 keyboard id=13 [slave keyboard (3)]
After investigating, the issue caused by calculate_edge_widths()[1] get a
shorter edge width because it treat it as unknown default model, then use
ewidth = width * .04 instead of the .07 ratio for MODEL_SYNAPTICS.
And this mis-detection is caused by model_lookup_table[] treat 0x0002:0x0007 as
MODEL_SYNAPTICS but driver gets 06CB:78F6 actually.
So, this issue also could be workaround by add one configuration in
/usr/share/X11/xorg.conf.d/50-synaptics-i2c.conf:
http://paste.ubuntu.com/23232807/
So, I'm confused about if I should proposed a patch to xserver-xorg-
input-synaptics debian/patches or having some way to file a pull-request
to free desktop upstream [2].
[1] http://paste.ubuntu.com/23232790/
[2] https://cgit.freedesktop.org/xorg/driver/xf86-input-synaptics/
** Affects: xserver-xorg-input-synaptics (Ubuntu)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/1627620
Title:
single touch vertical scrolling failed
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