Comment 264 for bug 606238

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Cefn (6-launchpad-net-cefn-com) wrote : Re: synaptic touchpad not recognized on dell latitude e6510 and others

Might be worth double checking there's no difference between the USB/Trackpad behaviour when powered, versus running on battery. I have sometimes seen artefacts similar to those you describe (lost input events) on my Q15R (N5100) when unpowered, which resolve themselves the moment you plug in the power cable.