How to enable DRI3 on Ubuntu 16.04

Question

I'm trying to learn Vulkan, so I install the Mesa Vulkan drivers and development files.

I downloaded some examples. I compiled the examples and tried to execute one. But when I run the file from terminal, it gave one warning and error:

WARNING: Haswell Vulkan support is incomplete
Error: No DRI3 support

I ask it from the person who wrote the example program, he said I have to enable the DRI3 for the running program. How can I do it in Ubuntu 16.04?

When I open the file "/etc/X11/xorg.conf", I see this:

Section "Device"
    Identifier "Default Card 0"
    BusID "PCI:0@0:2:0"
EndSection

What I need to do?

My environment: I'm using Intel Core i5 and Intel Haswell GPU.

Solution

Open this file: /etc/X11/xorg.conf.d/20-intel.conf as root and make the device section look like this

Section "Device"
   Identifier  "Intel Graphics"
   Driver      "intel"
   Option      "DRI"    "3"
EndSection

This is from the Arch wiki for Vulkan.

Comments

[Ibrahim Ipek]

When i try to open and save it as root with gedit, it gives this error: Could not find the file “/etc/X11/xorg.conf.d/20-intel.conf”

[Lennart Rolland]

is /etc/X11/xorg.conf.d/ dir used on Ubuntu?

[Darek Deoniziak]

I think dir for Ubuntu should be /usr/share/X11/xorg.conf.d/

[zeehio]

You should create the /etc/X11/xorg.conf.d/ directory first if it does not exist. /usr/share/X11/xorg.conf.d/ is there for system vendor options and not for custom user configuration. Read "man xorg.conf" for details.