# lsmod | grep -E "radeon|drm|fb" 
radeon               1351680  5
ttm                    69632  1 radeon
drm_kms_helper        126976  1 radeon
drm                   299008  8 radeon,ttm,drm_kms_helper
i2c_algo_bit           16384  1 radeon
fb_sys_fops            16384  1 drm_kms_helper
syscopyarea            16384  1 drm_kms_helper
sysfillrect            16384  1 drm_kms_helper
sysimgblt              16384  1 drm_kms_helper