Enable debugging info via debugfs

configname: CONFIG_FB_MBX_DEBUG

Linux Kernel Configuration
└─>Device Drivers
└─>Graphics support
└─>Frame buffer Devices
└─>Enable debugging info via debugfs
In linux kernel since version 2.6.20 (release Date: 2007-02-04)  
Enable this if you want debugging information using the debug
filesystem (debugfs)

If unsure, say N.