extra/
    mesa
        /usr/lib/dri/i915_dri.so
    glu (opengl utility library)
    mesademos

$ mhwd -l
> 0000:00:02.0 (0300:8086:0412) Display controller Intel Corporation:
--------------------------------------------------------------------------------
                  NAME               VERSION          FREEDRIVER           TYPE
--------------------------------------------------------------------------------
           video-linux            2018.05.04                true            PCI
            video-vesa            2017.03.12                true            PCI


$ mhwd -l -d
--------------------------------------------------------------------------------
> PCI Device: /devices/pci0000:00/0000:00:02.0 (0300:8086:0412)
  Display controller Intel Corporation Xeon E3-1200 v3/4th Gen Core Processor Integrated Graphics Controller
--------------------------------------------------------------------------------
  > INSTALLED:

   NAME:	video-intel
   ATTACHED:	PCI
   VERSION:	2017.03.24
   INFO:	X.org intel video driver. Standard open source driver for intel graphic cards.
   PRIORITY:	2
   FREEDRIVER:	true
   DEPENDS:	-
   CONFLICTS:	video-hybrid-intel-amdgpu-prime video-hybrid-intel-radeon-prime video-hybrid-intel-nouveau-prime video-hybrid-intel-ati-bumblebee video-hybrid-intel-nouveau-bumblebee video-hybrid-intel-nvidia-340xx-bumblebee video-hybrid-intel-nvidia-bumblebee 
   CLASSIDS:	0300 
   VENDORIDS:	8086 



  > AVAILABLE:

   NAME:	video-linux
   ATTACHED:	PCI
   VERSION:	2018.05.04
   INFO:	Standard open source drivers.
   PRIORITY:	2
   FREEDRIVER:	true
   DEPENDS:	-
   CONFLICTS:	-
   CLASSIDS:	0300 0380 0302 
   VENDORIDS:	1002 8086 10de 

   NAME:	video-vesa
   ATTACHED:	PCI
   VERSION:	2017.03.12
   INFO:	X.org vesa video driver.
   PRIORITY:	0
   FREEDRIVER:	true
   DEPENDS:	-
   CONFLICTS:	-
   CLASSIDS:	0300 
   VENDORIDS:	* 



$ /usr/bin/glxinfo | grep OpenGL
OpenGL vendor string: Intel Open Source Technology Center
OpenGL renderer string: Mesa DRI Intel(R) Haswell Desktop 
OpenGL core profile version string: 4.5 (Core Profile) Mesa 18.2.3
OpenGL core profile shading language version string: 4.50
OpenGL core profile context flags: (none)
OpenGL core profile profile mask: core profile
OpenGL core profile extensions:
OpenGL version string: 3.0 Mesa 18.2.3
OpenGL shading language version string: 1.30
OpenGL context flags: (none)
OpenGL extensions:
OpenGL ES profile version string: OpenGL ES 3.1 Mesa 18.2.3
OpenGL ES profile shading language version string: OpenGL ES GLSL ES 3.10
OpenGL ES profile extensions:

/etc/X11/mhwd.d/intel.conf 
Section "Device"
	Identifier  "Device0"
	Driver      "intel"
	BusID       "PCI:0:2:0"
	Option      "AccelMethod" "sna"
	Option      "DRI"    "true"
EndSection
 
Section "DRI"
        Group  "video"
        Mode   0666
EndSection
 
Section "Extensions"
	Option "Composite" "Enable"
	Option "RENDER"    "Enable"
EndSection
...

/etc/drirc
    ...