This article covers the Arch Linux support for the Lenovo ThinkPad Edge E330s laptop.

In some cases it is necessary to create:

/etc/X11/xorg.conf.d/50-touchpad.conf

Section "InputClass"
 Identifier "touchpad"
 MatchProduct "SynPS/2 Synaptics TouchPad"
 Driver "synaptics"
 # fix touchpad resolution
 Option "VertResolution" "100"
 Option "HorizResolution" "65"
 # disable synaptics driver pointer acceleration
 Option "MinSpeed" "1"
 Option "MaxSpeed" "1"
 # tweak the X-server pointer acceleration
 Option "AccelerationProfile" "2"
 Option "AdaptiveDeceleration" "16"
 Option "ConstantDeceleration" "16"
 Option "VelocityScale" "32"
EndSection

Also see: https://forums.lenovo.com/t5/Linux-Discussion/lenovo-e330-touchpad-problem-on-ubuntu-12-04-LTS-32-bit/td-p/1053541

A jumping cursor when releasing the finger makes it impossible to hit small objects. Solved with synclient(1) FingerHigh/Low:

$ synclient FingerHigh=40
$ synclient FingerLow=40

Brightness can only be switched between darkest and brightest values using OS method. The fix is to make the thinkpad-acpi kernel module control it: append thinkpad-acpi.brightness_enable=1 acpi.brightness_switch_enabled=0 to the kernel line in the boot loader.

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