How do I deactivate dynamic contrast on a Dell XPS?

I am experiencing annoying automatic backlight brightness changes under ubuntu 12.04 LTS on my Dell XPS ultrabook.

It seems to be connected to the amount of white pixels on the screen (switching back an forth between dark/light application windows makes the effect noticable, but also just scrolling through a website.) So I think it is the dynamic contrast feature of the notebook screen.

How do I turn this off in Ubuntu? Windows offers specific Intel driver options for this, but I can't find any for Ubuntu.

Model: Dell XPS 14 Ultrabook and currently running Unity

Reproduced on a Dell XPS 13^[1], there seem to be a real problem stemming from a collision between the graphics drivers, constantly calling the screen's brightness auto-adjust and causing the screen to flicker. See this bug report on another related issue (regarding broken functionality of function keys out of the box) that suggests a solution to the flickering problem as well;

The fix to both issues is offered by Kamal Mostafa from the Canonical Hardware Enablement Team as part of the Sputnik ^[2] Kernel PPA, while an independent earlier patch targets the function keys issue only (it is best, of course, to update with the former).

^[1] I happen to own an XPS 13 model, and incidentally installed the 12.04 the day I got it... This is not a Sputnik machine, however (see ^[2]).

^[2] The Sputnik project was Dell's effort to market a developer oriented edition of the Dell XPS 13 laptop, pre-installed with Ubuntu 12.04, and packed with developer-targeted goodies