Following Jedediah's hint I've built deb packages compiled from display-port 
branch of the driver's source and uploaded them to my PPA: 
https://launchpad.net/~morgwai/+archive/ppa (note that i386 binary packages are 
still waiting in the build queue and should be available within few hours).
They work ok for me (I can normally use monitor connected via Display-Port) and 
I hope they will be useful for others as well, but I haven't tested them on 
anything else than my own machine (ThinkPad X200 with docking station, Jaunty 
amd64) and I'm really not a device driver expert at all, so please don't ask me 
questions other than related to packaging (reporting whether it works fine for 
you is of course welcome as it may be useful to others).

I've compiled the sources from the last commit that didn't required much 
hacking: 
http://cgit.freedesktop.org/xorg/driver/xf86-video-intel/commit/?h=display-port&id=cc50de1a9eada785323f2dcc3a59e8e94284e17e
It was the last commit in the display-port before merge with master branch that 
incorporated commit 
http://cgit.freedesktop.org/xorg/driver/xf86-video-intel/commit/?h=display-port&id=1784efc1f0c74edda8c78fb1b0cdd989f0a088ad
 which made it impossible to turn DRM_MODE off and caused the compilation to 
fail on Jaunty. I don't really understand why this fails as the commit's 
comment says that this flag was only relevant for xserver older than 1.6 and 
Jaunty uses exactly 1.6. If somebody knows the reason and can prepare the 
patches that would allow to build the head of display-port branch on Jaunty 
then I'll be happy to include them and build next version of the driver.

Cheers

  Morg

-- 
[q45] displayport monitors not detected in Intrepid
https://bugs.launchpad.net/bugs/328484
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