Fixed a jumping cursor touchpad on a gentoo and debian laptop15.02.17

in gentoo and debian 8 my touchpad had a jumping cursor.
first i installed xinput
http://www.mepis.org/docs/en/index.php?title=Configuring_the_touchpad_with_xinput

but after adding the below file /usr/share/X11/xorg.conf.d/50-synaptics.conf
it stopped finally.

add the file 
/usr/share/X11/xorg.conf.d/50-synaptics.conf

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*"

Option "FingerLow"              "46"
    Option "FingerHigh"             "46"
    Option "ClickFinger1"           "1"
    Option "ClickFinger2"           "2"
    Option "ClickFinger3"           "3"
    Option "TapButton1"             "1"
    Option "TapButton2"             "2"
    Option "TapButton3"             "3"
    Option "AreaBottomEdge"         "85%"
    Option "SoftButtonAreas"        "60% 0 85% 0 40% 60% 85% 0" # Btn2 LRTB - Btn3 LRTB
    Option "EmulateMidButtonTime"   "75"
EndSection

http://askubuntu.com/questions/475421/lenovo-ideapad-unstable-touchpad-cursor

Anonymous

Fixed a jumping cursor touchpad on a gentoo and debian laptop15.02.17

Information Epoch 1779184834