Example from Intel graphic card which working:
    end of dmesh log
#-------------------------------
 . . .
[    0.000000] input: Video Bus as
/devices/LNXSYSTM:00/LNXSYBUS:00/PNP0A08:00/LNXVIDEO:00/input/input18
[    0.000000] [drm] Initialized i915 1.6.0 20151010 for 0000:00:02.0 on minor
0
[    0.000000] fbcon: inteldrmfb (fb0) is primary device
[    0.000000] Console: switching to colour frame buffer device 240x67
[    0.000000] i915 0000:00:02.0: fb0: inteldrmfb frame buffer device
[    0.000000] [drm:intel_set_pch_fifo_underrun_reporting [i915]] *ERROR*
uncleared pch fifo underrun on pch transcoder A
[    0.000000] [drm:cpt_irq_handler [i915]] *ERROR* PCH transcoder A FIFO
underrun
[    0.000000] ip_set: protocol 6
[    0.000000] netfilter PSD loaded - (c) astaro AG
[    0.000000] IFWLOG: register target
 . . .
#-------------------------------

#------------------------
$ lsmod
. . .
i915                  890176  3 
drm_kms_helper         79844  1 i915
drm                   232046  5 i915,drm_kms_helper
video                  24297  1 i915
. . .
#------------------------

checking
#-----------------------------------------------
$ modinfo i915
filename:      
/lib/modules/4.4.6-pclos1/kernel/drivers/gpu/drm/i915/i915.ko.xz
. . .
$ modinfo nouveau
filename:      
/lib/modules/4.4.6-pclos1/kernel/drivers/gpu/drm/nouveau/nouveau.ko.xz
. . .
#-----------------------------------------------

 Configuration:
#--------------------------------------
$ modprobe -c  | grep nouveau
alias pci:v000010DEd*sv*sd*bc03sc*i* nouveau
alias pci:v000012D2d*sv*sd*bc03sc*i* nouveau
#--------------------------------------

Blacklisted and disabled modules
#-----------------------------
$ modprobe --showconfig | egrep "^(blacklist|install)" | grep nouveau
$ 
#-----------------------------