Gracias a todos por sus respuestas. Al final la que mejor funcionó fue
la del eliminar la sección de Synaptics. Con las otras soluciones no
funcionaba el botón izquierdo al golpear el touchpad. Lo que me
fascinaba del xorg.conf de launchpad.net era que al pasar el dedo por la
orilla derecha se hacía un "scroll" en la ventana activa, además de que
al golpear en la esquina inferior derecha se activaba el botón derecho.

Y además al eliminar la sección de xorg.conf se eliminó ese molesto
bicho presente en las configuraciones propuestas, que anteriormente sólo
se había eliminado con la configuración de lauchpad.net: al pulsar dos
veces y recorrer hacia arriba, el puntero se mueve hasta arriba y a la
izquierda hasta llegar a la esquina de la pantalla. Si de algo sirve,
pongo mi xorg.conf. 

Saludos y gracias.


# /etc/X11/xorg.conf (xorg X Window System server configuration file)
#
# This file was generated by dexconf, the Debian X Configuration tool,
using
# values from the debconf database.
#
# Edit this file with caution, and see the /etc/X11/xorg.conf manual
page.
# (Type "man /etc/X11/xorg.conf" at the shell prompt.)
#
# This file is automatically updated on xserver-xorg package upgrades
*only*
# if it has not been modified since the last upgrade of the xserver-xorg
# package.
#
# If you have edited this file but would like it to be automatically
updated
# again, run the following command:
#   sudo dpkg-reconfigure -phigh xserver-xorg

Section "Files"
        FontPath        "/usr/share/fonts/X11/misc"
        FontPath        "/usr/X11R6/lib/X11/fonts/misc"
        FontPath        "/usr/share/fonts/X11/cyrillic"
        FontPath        "/usr/X11R6/lib/X11/fonts/cyrillic"
        FontPath        "/usr/share/fonts/X11/100dpi/:unscaled"
        FontPath        "/usr/X11R6/lib/X11/fonts/100dpi/:unscaled"
        FontPath        "/usr/share/fonts/X11/75dpi/:unscaled"
        FontPath        "/usr/X11R6/lib/X11/fonts/75dpi/:unscaled"
        FontPath        "/usr/share/fonts/X11/Type1"
        FontPath        "/usr/X11R6/lib/X11/fonts/Type1"
        FontPath        "/usr/share/fonts/X11/100dpi"
        FontPath        "/usr/X11R6/lib/X11/fonts/100dpi"
        FontPath        "/usr/share/fonts/X11/75dpi"
        FontPath        "/usr/X11R6/lib/X11/fonts/75dpi"
        # path to defoma fonts
        FontPath        "/var/lib/defoma/x-ttcidfont-conf.d/dirs/TrueType"
EndSection

Section "Module"
        Load    "i2c"
        Load    "bitmap"
        Load    "ddc"
        Load    "dri"
        Load    "extmod"
        Load    "freetype"
        Load    "glx"
        Load    "int10"
        Load    "vbe"
EndSection

Section "InputDevice"
        Identifier      "Generic Keyboard"
        Driver          "kbd"
        Option          "CoreKeyboard"
        Option          "XkbRules"      "xorg"
        Option          "XkbModel"      "pc104"
        Option          "XkbLayout"     "us"
EndSection

Section "InputDevice"
        Identifier      "Configured Mouse"
        Driver          "mouse"
        Option          "CorePointer"
        Option          "Device"                "/dev/input/mice"
        Option          "Protocol"              "ImPS/2"
        Option          "Emulate3Buttons"       "true"
EndSection

# Conf por defecto de xorg.conf
#Section "InputDevice"
#       Identifier      "Synaptics Touchpad"
#       Driver          "synaptics"
#       Option          "SendCoreEvents"        "true"
#       Option          "Device"                "/dev/psaux"
#       Option          "Protocol"              "auto-dev"
#       Option          "HorizScrollDelta"      "0"
#EndSection
#
#Section "InputDevice"
#        Identifier      "Synaptics Touchpad"
#        Driver          "synaptics"
#        Option          "SendCoreEvents"
#        Option          "Device"                "/dev/input/mouse0"
#        Option          "Protocol"              "auto-dev"
#        Option          "SHMConfig"             "true"
#        Option          "LeftEdge"              "120"
#        Option          "RightEdge"             "830"
#        Option          "TopEdge"               "140"
#        Option          "BottomEdge"            "680"
#        Option          "FingerLow"             "8"
#        Option          "FingerHigh"            "9"
#        Option          "MaxTapTime"            "200"
#        Option          "MaxTapMove"            "150"
#        Option          "MaxDoubleTapTime"      "200"
#        Option          "ClickTime"             "100"
#        Option          "FastTaps"              "false"
#        Option          "EmulateMidButtonTime"  "75"
#        Option          "VertScrollDelta"       "25"
#        Option          "HorizScrollDelta"      "100"
#        Option          "MinSpeed"              "0.1"
#        Option          "MaxSpeed"              "0.7"
#        Option          "AccelFactor"           "0.05"
#        Option          "EdgeMotionMinZ"        "30"
#        Option          "EdgeMotionMaxZ"        "160"
#        Option          "EdgeMotionMinSpeed"    "200"
#        Option          "EdgeMotionMaxSpeed"    "200"
#        Option          "EdgeMotionUseAlways"   "1"
#        Option          "UpDownScrolling"       "1"
#        Option          "TouchpadOff"           "false"
#        Option          "GuestMouseOff"         "false"
#        Option          "LockedDrags"           "false"
#        Option          "RTCornerButton"        "0"
#        Option          "RBCornerButton"        "0"
#        Option          "LTCornerButton"        "0"
#        Option          "LBCornerButton"        "0"
#        Option          "TapButton1"            "1"
#        Option          "TapButton2"            "2"
#        Option          "TapButton3"            "3"
#        Option          "CircularScrolling"     "1"
#        Option          "CircScrollDelta"       "0.1"
#        Option          "CircScrollTrigger"     "2"
#        Option          "CircularPad"           "0"
#        Option          "PalmDetect"            "0"
#        Option          "PalmMinWidth"          "10"
#        Option          "PalmMinZ"              "200"
#        Option          "CoastingSpeed"         "0"
#EndSection 
#
# Conf obtenida de
# https://launchpad.net/ubuntu/+source/xorg-driver-synaptics/+bug/36219
#Section "InputDevice"
#       Identifier      "Synaptics Touchpad"
#       Driver          "synaptics"
#       Option          "CorePointer"
#       Option          "Device"                "/dev/psaux"
#       Option          "Protocol"              "auto-dev"
#       Option          "LeftEdge"              "120"
#       Option          "RightEdge"             "830"
#       Option          "TopEdge"               "120"
#       Option          "BottomEdge"            "650"
#       Option          "FingerLow"             "14"
#       Option          "FingerHigh"            "15"
#       Option          "MaxTapTime"            "180"
#       Option          "MaxTapMove"            "110"
#       Option          "ClickTime"             "0"
#       Option          "EmulateMidButtonTime"  "75"
#       Option          "VertScrollDelta"       "10"
#       Option          "HorizScrollDelta"      "10"
#       Option          "MinSpeed"              "0.45"
#       Option          "MaxSpeed"              "0.75"
#       Option          "AccelFactor"           "0.020"
#       Option          "EdgeMotionMinSpeed"    "200"
#       Option          "EdgeMotionMaxSpeed"    "200"
#       Option          "UpDownScrolling"       "1"
#       Option          "CircularScrolling"     "0"
#       Option          "CircScrollDelta"       "0.1"
#       Option          "CircScrollTrigger"     "2"
#       Option          "SHMConfig"             "true"
#EndSection

Section "Device"
        Identifier      "Intel Corporation Mobile 915GM/GMS/910GML Express 
Graphics
Controller"
        Driver          "i810"
        BusID           "PCI:0:2:0"
EndSection

Section "Monitor"
        Identifier      "Monitor genérico"
        Option          "DPMS"
EndSection

Section "Screen"
        Identifier      "Default Screen"
        Device          "Intel Corporation Mobile 915GM/GMS/910GML Express 
Graphics
Controller"
        Monitor         "Monitor genérico"
        DefaultDepth    24
        SubSection "Display"
                Depth           1
                Modes           "1280x768"
        EndSubSection
        SubSection "Display"
                Depth           4
                Modes           "1280x768"
        EndSubSection
        SubSection "Display"
                Depth           8
                Modes           "1280x768"
        EndSubSection
        SubSection "Display"
                Depth           15
                Modes           "1280x768"
        EndSubSection
        SubSection "Display"
                Depth           16
                Modes           "1280x768"
        EndSubSection
        SubSection "Display"
                Depth           24
                Modes           "1280x768"
        EndSubSection
EndSection

Section "ServerLayout"
        Identifier      "Default Layout"
        Screen          "Default Screen"
        InputDevice     "Generic Keyboard"
        InputDevice     "Configured Mouse"
#       InputDevice     "Synaptics Touchpad"
EndSection

Section "DRI"
        Mode    0666
EndSection



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