Vertical screen resolution

configname: CONFIG_INPUT_MOUSEDEV_SCREEN_Y

Linux Kernel Configuration
└─>Device Drivers
└─>Input device support
└─>Vertical screen resolution
In linux kernel since version 2.6.20 (release Date: 2007-02-04)  
If you're using a digitizer, or a graphic tablet, and want to use
it as a mouse then the mousedev driver needs to know the X window
screen resolution you are using to correctly scale the data. If
you're not using a digitizer, this value is ignored.