Dell Touchpad - erractic movement
Hope somebody can help with this one.
We are experiencing some random erratic movement on the touch pads of some of our Dell E5520 laptops.
This only occurs when the laptop is docked (Dell E-port) and thus connected to the wired network, usb, speakers and projector (Dell S500WI).
As the projector is interactive (with a pen which acts as a mouse) we have made sure that the pen is turned off, which makes no difference.
We have also updated the touch pad drivers, which again made no difference.
When un-docked, the laptop exhibiting the fault has no touchpad problems - put it back on the dock, and the problem returns.
I believe (although i need to check) that we have narrowed the problem down (by unplugging everything one by one) to being the vga cable between the laptop and the projector. However, the installation across the school was done at the same time using the same equipment, but is only affecting a handful of users. All the laptops are identical E5520's (again purchased at the same time) and have identical software images on them.
Has anyone come across this before or have any ideas on what to look for next?