Enable backtrace history for lock contention

configname: CONFIG_DRM_DEBUG_MODESET_LOCK

Linux Kernel Configuration
└─>Device Drivers
└─>Graphics support
└─>Enable backtrace history for lock contention
In linux kernel since version 5.2 (release Date: 2019-07-07)  
Enable debug tracing of failures to gracefully handle drm modeset lock
contention. A history of each drm modeset lock path hitting -EDEADLK
will be saved until gracefully handled, and the backtrace will be
printed when attempting to lock a contended lock.

If in doubt, say "N".