X11 intel driver on Lenovo t510/GMA HD

[john heasley <heas%shrubbery.net@localhost>]

I'm trying to come up with the video device/screen portions of xorg.conf
(on current) for an Intel GMA HD in a Lenovo t510 ("descrete graphics").
I can't seem to make sense of which chips the xorg Intel driver supports.

http://en.wikipedia.org/wiki/Intel_GMA#HD_Graphics_.28GMA_HD.29 seems to
indicate that the GMA HD is a mobile-packaged version of the
i3-5x0/Clarkdale which is a GMA 500/Poulsbo?

http://www.x.org/wiki/IntelGraphicsDriver seems to indicate that the G5*
is not yet supported by xf86-video-intel.  But, I've seen several Linux
forum posts indicating that it is, though I think they have a more recent
version (2.9.1?) of the driver, which itself requires a more recent version
of the xorg libs.  However, I see no indication in the driver's NEWS file
that the G5* support has been added.

I believe this t510 is capable of 1600x900, but 1280x800 seems to be the
greatest supported by the vesa driver, which i have managed to get.  I
still want the 1600x900, of course.

clues?

http://www.shrubbery.net/~heas/Xorg.0.log
http://www.shrubbery.net/~heas/Xorg.0.log.intel