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** Changed in: xserver-xorg-input-synaptics (Ubuntu)
       Status: New => Incomplete

** Changed in: xserver-xorg-input-synaptics (Ubuntu)
   Importance: Undecided => Low

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https://bugs.launchpad.net/bugs/876782

Title:
  Touchpad lose X axis and mostly detect 2 fingers

Status in “xserver-xorg-input-synaptics” package in Ubuntu:
  Incomplete

Bug description:
  After some time (randomly) the touchpad stop working correctly. 
  i'm on a acer aspire 5943g. This is the a grep of my Xorg.log:
  [    32.674] (II) config/udev: Adding input device SynPS/2 Synaptics TouchPad 
(/dev/input/event9)
  [    32.675] (**) SynPS/2 Synaptics TouchPad: Applying InputClass "touchpad 
catchall"
  [    32.679] (II) Using input driver 'synaptics' for 'SynPS/2 Synaptics 
TouchPad'
  [    32.679] (**) SynPS/2 Synaptics TouchPad: always reports core events
  [    33.016] (--) synaptics: SynPS/2 Synaptics TouchPad: x-axis range 1472 - 
5744
  [    33.016] (--) synaptics: SynPS/2 Synaptics TouchPad: y-axis range 1408 - 
4792
  [    33.016] (--) synaptics: SynPS/2 Synaptics TouchPad: pressure range 0 - 
255
  [    33.016] (--) synaptics: SynPS/2 Synaptics TouchPad: finger width range 0 
- 0
  [    33.016] (--) synaptics: SynPS/2 Synaptics TouchPad: buttons: left right 
double triple scroll-buttons
  [    33.016] (--) synaptics: SynPS/2 Synaptics TouchPad: Vendor 0x2 Product 
0x7
  [    33.136] (--) synaptics: SynPS/2 Synaptics TouchPad: touchpad found
  [    33.136] (**) SynPS/2 Synaptics TouchPad: always reports core events
  [    33.256] (II) XINPUT: Adding extended input device "SynPS/2 Synaptics 
TouchPad" (type: TOUCHPAD, id 12)
  [    33.256] (**) synaptics: SynPS/2 Synaptics TouchPad: (accel) MinSpeed is 
now constant deceleration 2.5
  [    33.257] (**) synaptics: SynPS/2 Synaptics TouchPad: MaxSpeed is now 1.75
  [    33.257] (**) synaptics: SynPS/2 Synaptics TouchPad: AccelFactor is now 
0.037
  [    33.257] (**) SynPS/2 Synaptics TouchPad: (accel) keeping acceleration 
scheme 1
  [    33.257] (**) SynPS/2 Synaptics TouchPad: (accel) acceleration profile 1
  [    33.257] (**) SynPS/2 Synaptics TouchPad: (accel) acceleration factor: 
2.000
  [    33.257] (**) SynPS/2 Synaptics TouchPad: (accel) acceleration threshold: 
4
  [    33.257] (--) synaptics: SynPS/2 Synaptics TouchPad: touchpad found
  [    33.258] (II) config/udev: Adding input device SynPS/2 Synaptics TouchPad 
(/dev/input/mouse0)

  I debugged a little with synclient. Normally (as stated above) the touchpad 
area is from 1472 to 5744 for the x-axis and 1408 to 4792 on the y-axis.
  When this happen:
  1) touching the right side i get x: 5800 (correct), istead on the left side 
5600(incorrect). So it's like the x coordinate isn't read correctly on the left 
side of the touchpad.
  2) Related to the first issue, doing the same thing in an area close to the 
bottom-right corner i get a value of x that range from 5000 to 5700. Thus the 
touchpad somehow works on the bottom right area.
  3) However if i touch on the right area and move to the left area without 
removing the finger the x coordinate correctly range from 5800 to 1100!! 
  4) the other issue it's the wrong number of fingers. Again touching on the 
bottom-right corner i get one finger (correct), instead on the left side 2

  I didn't find the reason that generated this bug, so i can't reproduce
  it. Looking at the xorg logs or dmesg i didn't notice any error
  message.

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