lspci -knn | egrep 'VGA|3D' -A2
00:02.0 VGA compatible controller [0300]: Intel Corporation 3rd Gen Core processor Graphics Controller [8086:0156] (rev 09)
Subsystem: ASUSTeK Computer Inc. Device [1043:124d]
Kernel driver in use: i915
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01:00.0 3D controller [0302]: NVIDIA Corporation GF117M [GeForce 610M/710M/820M / GT 620M/625M/630M/720M] [10de:1140] (rev a1)
Subsystem: ASUSTeK Computer Inc. GeForce GT 710M [1043:223a]
Kernel driver in use: nouveau
cat /var/log/Xorg.0.log | egrep -i "(error|fail|warning)"
(WW) warning, (EE) error, (NI) not implemented, (??) unknown.
[ 30.233] (WW) Warning, couldn't open module nvidia
[ 30.233] (EE) Failed to load module "nvidia" (module does not exist, 0)
[ 30.278] (II) Failed to load module "intel" (already loaded, -1217008138)
[ 30.278] (WW) Warning, couldn't open module nvidia
[ 30.278] (EE) Failed to load module "nvidia" (module does not exist, 0)
[ 30.279] (II) Failed to load module "nouveau" (already loaded, 0)
[ 30.279] (II) Failed to load module "modesetting" (already loaded, 0)
[ 30.279] (II) Failed to load module "fbdev" (already loaded, 0)
[ 30.279] (II) Failed to load module "vesa" (already loaded, 0)
[ 30.348] (EE) NOUVEAU(G0): [XvMC] Failed to initialize extension.