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Old March 27th, 2009   #6
spupy
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Re: Do these multitouch instructions work for you?

Quote:
Originally Posted by Polygon View Post
no there isnt.

my touchpad on my laptop, the native windows drivers dont give me multi touch support, but with linux i can do two touch scrolling out of the box.
I'm almost certain that there is a hardware requirement. You can enable the option as this guy did, but if your touchpad isn't able to detect more than 2 fingers (like mine), nothing will happen. This is just a case of But-It-Works-For-Me.
In fact, I was able to activate two-finger-scroll on my touchpad. But I did it with a dirty mod of the synaptics driver, and it has nothing to do will how many finger are detected, but rather with the fact that one and two fingers give different pressure. Measuring the pressure is a safe way to tell if there is more than 1 finger on the touchpad.

There is a safe and certain way to know if your touchpad has the ability to detect multiple fingers. For this purpose you need the program synclient. (I'm not sure where I have it from. Google it.)
Start it like this:
Code:
synclient -m 50
The output looks like this:
Code:
~ $ synclient -m 100
    time     x    y   z f  w  l r u d m     multi  gl gm gr gdx gdy
   0.000   828  212   0 0  0  0 0 0 0 0  00000000   0  0  0   0   0
   0.700   428  272  57 1  0  0 0 0 0 0  00000000   0  0  0   0   0
   0.801   458  242  59 1  0  0 0 0 0 0  00000000   0  0  0   0   0
   0.901   488  229  59 1  0  0 0 0 0 0  00000000   0  0  0   0   0
   1.001   496  222  59 1  0  0 0 0 0 0  00000000   0  0  0   0   0
   1.101   500  219  61 1  0  0 0 0 0 0  00000000   0  0  0   0   0
   1.201   501  219   0 0  0  0 0 0 0 0  00000000   0  0  0   0   0
   2.001   480  199 117 1  0  0 0 0 0 0  00000000   0  0  0   0   0
   2.101   480  203 119 1  0  0 0 0 0 0  00000000   0  0  0   0   0
   2.201   480  205 118 1  0  0 0 0 0 0  00000000   0  0  0   0   0
   2.301   480  207 120 1  0  0 0 0 0 0  00000000   0  0  0   0   0
   2.402   478  219 122 1  0  0 0 0 0 0  00000000   0  0  0   0   0
   2.502   478  222 120 1  0  0 0 0 0 0  00000000   0  0  0   0   0
   2.602   477  240 118 1  0  0 0 0 0 0  00000000   0  0  0   0   0
   2.702   476  266 123 1  0  0 0 0 0 0  00000000   0  0  0   0   0
   2.802   476  266   0 0  0  0 0 0 0 0  00000000   0  0  0   0   0
The f column is the number of fingers currently on the touchpad. If you see the number 2 when you try to scroll with 2 finger - congratulations, you can enable multi-touch (or, ahem, double-touch). Otherwise, you are out of luck.

Also, ALPS touchpads, which are not Synaptics touchpads, also use the synaptics driver. ALPS touchpads generally don't support multitouch, while Synaptics touchpads mostly do. (Words taken from the manual of synclient).
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