How to enable DRI for i915 laptop video card when glxgears not render output without error provided?

I've did

sudo apt-get purge nvidia*
sudo apt-get install --reinstall xserver-xorg-video-intel libgl1-mesa-glx libgl1-mesa-dri xserver-xorg-core
sudo dpkg-reconfigure xserver-xorg
sudo update-alternatives --remove gl_conf /usr/lib/nvidia-current/ld.so.conf

I've also blacklisted nouveau driver

/etc/modprobe.d/blacklist-nvidia-nouveau.conf
blacklist nouveau
options nouveau modeset=0

But when i try to run glxgears it renders nothing(black screen).

$ vblank_mode=0 glxgears
ATTENTION: default value of option vblank_mode overridden by environment.

Errors in xorg log:

grep "EE" /var/log/Xorg.0.log (WW) warning, (EE) error, (NI) not implemented, (??) unknown.
[ 274.620] (II) Initializing extension MIT-SCREEN-SAVER
[ 274.623] (EE) AIGLX error: dlopen of /usr/lib/x86_64-linux-gnu/dri/i965_dri.so failed (/usr/lib/x86_64-linux-gnu/dri/i965_dri.so: cannot open shared object file: No such file or directory)
[ 274.623] (EE) AIGLX error: unable to load driver i965

1 Answer

sudo prime-select intel

This util is present in ubuntu fresh install.

Next package must be installed.

 i A libgl1-mesa-dri - free implementation of the OpenGL API -- DRI modules