Enable extended debugging


Linux Kernel Configuration
└─>Device Drivers
└─>Network device support
└─>ATM drivers
└─>Enable extended debugging
In linux kernel since version 2.6.12  
Extended debugging records various events and displays that list
when an inconsistency is detected. This mechanism is faster than
generally using printks, but still has some impact on performance.
Note that extended debugging may create certain race conditions
itself. Enable this ONLY if you suspect problems with the driver.