Mouse input jump and lag after update

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https://bbs.archlinux.org – hi, I have the similar problem(laptop). The touchpad is unusable now, but a usb mouse is ok. I did google this, and found some solutions concerning   xorg.conf setting. but that does not work for me. yjcong https://bbs.archlinux.org/profile.php?id=27073 2013-01-27T04:41:36Z (HowTos)