Solved poor video quality in Arch after updating Intel drivers
I was not able to run some games that require 3D graphics and closed instantaneously at being executed, also could not view properly video (lags).
The common error message I had was in games: ../../../src/mesa/swrast/s_renderbuffer.c:584: map_attachment: Assertion `srb->Map' failed.
I wasn't sure about this until I installed mesa-demos and runned glxgears. Reading the Wiki Arch https://wiki.archlinux.org/index.php/Intel_Graphics and choosing the SNA acceleration method I got working everything well.
Basically create a file /etc/X11/xorg.conf.d/20-intel.conf and append the following:
Identifier "Intel Graphics"
Option "AccelMethod" "sna"
Note: I was not able to see videos until I chose in vlc to take as default output X11 video and in mplayer command used "-vo X11" command"
Also edited as root /etc/mplayer/mplayer.conf which was blank adding: vo=x11 because local configuration file did not work.
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