I'm running Ubuntu 16.04 with my i3-6100 using integrated HD 530 graphics. Works fine. My question is should I install intel graphics stack release 2016 Q2 (https://01.org/linuxgraphics/downloads/2016q2-intel-graphics-stack-release)? Just wondering if it would give me some options to customize my GPU settings or improve performance. Sorry about the noob questions.
No you should not. 16.04 ships with Kernel 4.4, the download you linked to is for 4.6. Intel Graphics for Linux Version 1.4.0 would be correct but:
- Ubuntu 16.04 - The Graphic Stack (i915) is up to date
No, if it's a newer version at all it's only slightly newer. Intel's graphics drivers are open-source and use the Mesa OpenGL implementation, so they are included by default in Ubuntu. If you want a "bleeding-edge" development version, you may want to check out adding the Oibaf or Padoka PPAs.
However, I would say, "if it ain't broke, don't fix it."