Как и на Dell из №612 работает левый верхний угол.

Приведите, пожалуйста конфиги из Sabayon
Нужен /etc/X11/xorg.conf.d/touchpad.conf или аналогичный и /etc/X11/xorg.conf

xorg.conf

# Rebuild all X11 modules (mostly useful after xorg-server ABI change).
[x11-module-rebuild]
class = portage.sets.dbapi.VariableSet
world-candidate = false
variable = CATEGORY
includes = x11-drivers

# Example xorg.conf.d snippet that assigns the touchpad driver
# to all touchpads. See xorg.conf.d(5) for more information on
# InputClass.
# DO NOT EDIT THIS FILE, your distribution will likely overwrite
# it when updating. Copy (and rename) this file into
# /etc/X11/xorg.conf.d first.
# Additional options may be added in the form of
#   Option "OptionName" "value" 
#
Section "InputClass" 
        Identifier "touchpad catchall" 
        Driver "synaptics" 
        MatchIsTouchpad "on" 
# This option is recommend on all Linux systems using evdev, but cannot be
# enabled by default. See the following link for details:
# http://who-t.blogspot.com/2010/11/how-to-ignore-configuration-errors.html
#       MatchDevicePath "/dev/input/event*" 
EndSection

Section "InputClass" 
        Identifier "touchpad ignore duplicates" 
        MatchIsTouchpad "on" 
        MatchOS "Linux" 
        MatchDevicePath "/dev/input/mouse*" 
        Option "Ignore" "on" 
EndSection

# This option enables the bottom right corner to be a right button on
# non-synaptics clickpads.
# This option is only interpreted by clickpads.
Section "InputClass" 
        Identifier "Default clickpad buttons" 
        MatchDriver "synaptics" 
        Option "SoftButtonAreas" "50% 0 82% 0 0 0 0 0" 
#       To disable the bottom edge area so the buttons only work as buttons,
#       not for movement, set the AreaBottomEdge
#       Option "AreaBottomEdge" "82%" 
EndSection

# This option disables software buttons on Apple touchpads.
# This option is only interpreted by clickpads.
Section "InputClass" 
        Identifier "Disable clickpad buttons on Apple touchpads" 
        MatchProduct "Apple|bcm5974" 
        MatchDriver "synaptics" 
        Option "SoftButtonAreas" "0 0 0 0 0 0 0 0" 
EndSection

Да, явно это что-то с тачпадом Alps, т.к. в #612 тоже такой тачпад используется:

I: Bus=0011 Vendor=0002 Product=0008 Version=0300
N: Name="AlpsPS/2 ALPS GlidePoint" 
P: Phys=isa0060/serio1/input0
S: Sysfs=/devices/platform/i8042/serio1/input/input6
U: Uniq=
H: Handlers=mouse1 event6 
B: PROP=8
B: EV=b
B: KEY=e420 0 70000 0 0 0 0 0 0 0 0
B: ABS=2608000 1000003

Удалось ли решить проблему с конфигом Sabayon как примером? Готов тестировать для #612, если надо.

CLDX 13.19 - баг всё ещё присутствует. Как помочь устранению его?

А у вас у самого с конфигом от сабайона работает? У нас нет таких девайсов сейчас и проверить нам не на чем.