I am running a Haswell ultrabook and just read about the Intel Graphics Installer, and Kubuntu 14.04.
I want to know, if there's an advantage, if I install.
If it's not running for 14.04, what would be the advantage if I install on 13.10?
Reading the README.in file from the source package, I found the section below. Looking for packages in trusty, I found that the trusty packages are up to date.
I couldn't find benchmarks on the net that answer your question about improvements in power consumption between the stock saucy and the newer driver versions. This site may not be suited for such a topic.
The intel-linux-graphics-installer v 1.0.4 does not support Ubuntu 14.04 LTS. You will receive an error that this distribution is not supported when trying to run the installer. I would guess vs 1.0.5 will include 14.04 LST support as 14.04 is mentioned in the documentation.
I've found the advantage to be better video performance and less power consumption.
I had been using the installer under 13.10, where it performed flawlessly. However, I upgraded to 14.04 last week, where the drivers reverted to the default, since the Installer isn't supported yet. Full screen HD currently shows some tearing and the box is noticeably warmer to the touch. It's not the end of the world, but I do wish I'd waited to upgrade until after a installer was released.
Of course, my experience is somewhat anecdotal. I'm running this on a small, fanless system with an i3-3220T chip that has Intel HD Graphics 2500. Yours will probably preform better overall, being more powerful hardware.
these are advantages of the new Intel Graphics Installer vs stock driver in 13.10 is this what you mean?
1.Support for Intel Celeron N281 CPU w/Intel HD Graphics
2.SandyBridge’s New Acceleration (SNA) enabled by default on all UXA-supported hardware
3.Power saving improvements for “Haswell” chips w/Intel HD Graphics
4.Driver support for Iris Pro 5200, and Intel HD 5000 & 5100 graphics
5.MPEG-2 encoding improvements for 3rd and 4th Gen Intel CPUs paired with Intel HD Graphics
6.Rendering fix for DotA on Wine