I am also using KDE. In early days after my installation Touchpad not worked properly.
After loading KDE, my touchpad behaved ubnormally. Only
upper diagonal part worked as mouse.
lower diagonal worked as scroll. Even tapping of touchpad is also not worked.
Then i had modified the file /etc/x11/xorg.conf file in "su" mode.
My present file has mouse setting as follows
Quote:
Section "InputDevice"
Driver "synaptics"
Identifier "Mouse[1]"
Option "AccelFactor" "0.01"
Option "BottomEdge" "650"
Option "CircScrollDelta" "0.1"
Option "CircScrollTrigger" "2"
Option "CircularScrolling" "1"
Option "Device" "/dev/input/mice"
Option "EdgeMotionMaxSpeed" "15"
Option "EdgeMotionMinSpeed" "15"
Option "Emulate3Buttons" "on"
Option "EmulateMidButtonTime" "75"
Option "FingerHigh" "15"
Option "FingerLow" "14"
Option "HorizScrollDelta" "20"
Option "LeftEdge" "120"
Option "MaxSpeed" "0.5"
Option "MaxTapMove" "110"
Option "MaxTapTime" "180"
Option "MinSpeed" "0.2"
Option "Name" "Touchpad"
Option "Protocol" "auto-dev"
Option "RightEdge" "830"
Option "SHMConfig" "on"
Option "TopEdge" "120"
Option "UpDownScrolling" "1"
Option "Vendor" "ALPS"
Option "VertScrollDelta" "20"
Option "ZAxisMapping" "4 5"
EndSection
Section "InputDevice"
Driver "synaptics"
Identifier "Mouse[3]"
Option "AccelFactor" "0.01"
Option "BottomEdge" "650"
Option "CircScrollDelta" "0.1"
Option "CircScrollTrigger" "2"
Option "CircularScrolling" "1"
Option "Device" "/dev/input/mice"
Option "EdgeMotionMaxSpeed" "15"
Option "EdgeMotionMinSpeed" "15"
Option "Emulate3Buttons" "on"
Option "EmulateMidButtonTime" "75"
Option "FingerHigh" "15"
Option "FingerLow" "14"
Option "HorizScrollDelta" "20"
Option "LeftEdge" "120"
Option "MaxSpeed" "0.5"
Option "MaxTapMove" "110"
Option "MaxTapTime" "180"
Option "MinSpeed" "0.2"
Option "Name" "Touchpad"
Option "Protocol" "auto-dev"
Option "RightEdge" "830"
Option "SHMConfig" "on"
Option "TopEdge" "120"
Option "UpDownScrolling" "1"
Option "Vendor" "ALPS"
Option "VertScrollDelta" "20"
Option "ZAxisMapping" "4 5"
EndSection
Section "InputDevice"
Driver "mouse"
Identifier "Mouse[5]"
Option "Buttons" "5"
Option "Device" "/dev/input/mice"
Option "Name" "ImPS/2 Generic Wheel Mouse"
Option "Protocol" "explorerps/2"
Option "Vendor" "Sysp"
Option "ZAxisMapping" "4 5"
EndSection
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Now my KDE is enabled touchpad tapping, use of whole touchpad area.
It may be useful for you. Backup your xorg.conf file. Replace your touchpad settings with mine. Restart and check.