[ltp] Disabling moving/tapping touchpad but leave scrolling?

[Richard Neill]

Jiang Qian wrote:
>>What you want to do is use udev to write a separate rule for the 
>>TPoint and TPad. Then, set up 2 different mice in xorg.conf (instead 
>>of /dev/input/mice). Then, configure as you wish. Eg you can map the 
>>button 1,2,3 presses to some non-existent buttons.
> 
> Could you be a bit more specific about "write a separate rule"? Which 
> configuration file I should change?  Do I need to restart computer after 
> the change or I can just restart some service?

http://reactivated.net/writing_udev_rules.html

> 
> Sorry that I'm not understanding here. Importantly, even if touchpad are 
> configured separately, I want *touchpad* to not tapping/moving mouse but 
> only scrolling. Any idea how to configure touchpad device that way?  
> 
> Also I tought I've already have two different devices. I have two 
> section named "InputeDevice":
> 
> Section "InputDevice"
> 	Identifier	"Configured Mouse"
> 	Driver		"mouse"
> 	Option		"CorePointer"
> 	Option		"Device"		"/dev/input/mice"
> 	Option		"Protocol"		"ImPS/2"
> 	Option		"Emulate3Buttons"	"true"
> #	Option          "EmulateWheel"          "true"
> #	Option          "EmulateWheelButton"    "2"
> 	Option		"ZAxisMapping"		"4 5"
> #	Option		"XAxisMapping"		"6 7"
> #	Option 		"EmulateWheelTimeout" 	"200"
> 
> EndSection
> Section "InputDevice"
> 	Identifier      "Synaptics Touchpad"
> 	Driver          "synaptics"
> 	Option          "SendCoreEvents"        "true"
> 	Option          "Device"                "/dev/psaux"
> 	Option          "Protocol"              "auto-dev"
> 	Option		"SHMConfig"		"on"
> #        Option		"HorizScrollDelta"	"0"
> EndSection


/dev/input/mice is a hybrid of both.  That won't help you!

You want
   device 1 =  /dev/input/mouseX
   device 2 = /dev/input/mouseY    (or maybe eventY)

where X,Y depend on the order of module loading at bootup, or use a udev 
rule for the symlinks.


> What exact does ZAxisMapping do?

I'm not actually quite sure...

> 
> 
>>For scrolling, are you aware of EmulateWheel?  xorg.conf:
>>
>>Option "Device" "/dev/psaux"
>>Option "EmulateWheel" "on"          #Button 2 => emulated scroll wheel.
>>Option "EmulateWheelButton" "2"
>>Option "EmulateWheelTimeout" "200"
>>Option "XAxisMapping" "6 7"         #EmulatedWheel vertical/horizontal 
>>pointer motion causes fake button 4,5 or 6,7 presses.
>>Option "YAxisMapping" "4 5"
> 
> Yes I did try that. However one of the most important hardware feature 
> of thinkpad for me is the presence of the third/middle mouse button, 
> which I use to paste the unix way. I also use it to middle click a link 
> to open in a new tab. I'm very addicted to this so it's hard for me to 
> change and use the scroll wheel while holding down middle button.

I do that too. That's the point of the EmulateWheelTimeout (which only 
works in/after xorg 6.9.) A short tap of the button -> middle-click; a 
long press + move pointer -> scroll.


Richard