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Erratic Synaptics Touchpad - jumps to I beam position...
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stardotstar
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Joined: 10 Feb 2006
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PostPosted: Sun Oct 22, 2006 11:21 am    Post subject: Erratic Synaptics Touchpad - jumps to I beam position... Reply with quote

The mouse tends to jump to the pointer position without reason while I am typing and also can do a double tap (middle button) and therefore insert some text that I have selected elsewhere. Sometimes I think this is because I am laying my palms on the notebook body near the touchpad but I am pretty sure I am not accidently touching the pad. Nor do I think that I am accidently brushing the pad when I get the mouse jumping elsewhere suddenly in my text block - very annoying!

Anyone relate to this?

Code:

  Section "InputDevice"
       Identifier      "AppleTouchPad"
       Driver          "synaptics"
        Option          "SHMConfig" "on"
#       Option          "CorePointer"
       Option          "Device"                "/dev/input/appletouchpad"
       Option          "Protocol"              "event"
       Option  "LeftEdge"      "100"
       Option  "RightEdge"     "1120"
       Option  "TopEdge"       "50"
       Option  "BottomEdge"    "310"
       Option  "FingerLow"     "25"
       Option  "FingerHigh"    "30"
       Option  "MaxTapTime"    "180"
       Option  "MaxTapMove"    "220"
       Option  "MaxDoubleTapTime"      "180"
       Option  "VertScrollDelta"       "20"
       Option  "HorizScrollDelta"      "50"
       Option  "MinSpeed"      "0.79"
       Option  "MaxSpeed"      "0.88"
       Option  "AccelFactor"   "0.0015"
       Option  "SHMConfig"     "on"
EndSection


So this is an Apple MacBook Pro and the touchpad is not too bad on the whole - I would like it to be more sensitive (like the IBM ThinkPad - beautiful touchpad) and somewhat more accelerated - that maybe just settings but its worth mentioning.

I find that the touchpad is not erratic in its movement until it just jumps!

Now I have heard that there is a way of disengaging the touchpad when typing but that this is slow when reengaging the touchpad - why have I never experienced this with my ThinkPad?
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stardotstar
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PostPosted: Fri Nov 03, 2006 10:19 am    Post subject: Reply with quote

bumpos :-)
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PostPosted: Sat Nov 04, 2006 2:24 am    Post subject: Reply with quote

I'm using a Toshiba A45-S150. I have the same problem with it jumping, but it jumps to random locations while I'm moving it, instead of to the pointer when I type.

This doesn't seem to be unique to linux, but it may be a "feature" of synaptics/alps touch pads as my other computer, an HP zv6000 w/ WinXP, has the jumping problem as well.

Also, I had the same problem as you with the mouse moving a short distance for a lot of finger motion until I happened across this in the gentoo wiki at gentoo-wiki.com

Option "MinSpeed" "0.3"
Option "MaxSpeed" "0.6"
Option "AccelFactor" "0.0100"

Put that into your touchpad's section. Modify the values to get a feel for it, just passing on the warning that 1.0 = Very Fast.
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