On an Intel i5-430M (an "Arrandale"), with onboard Intel GMA HD graphics (aka "Ironlake"), and without switchable graphics, I have a separate openSUSE 11.3 installation, with two out-of-stream changes:
Kernel: 2.6.37-rc3-git1-5 (source: Index of /repositories/Kernel:/HEAD/openSUSE_11.3)
Xorg from Index of /repositories/X11:/XOrg/openSUSE_11.3.
The environment displays as follows:
00:02.0 VGA compatible controller: Intel Corporation Core Processor Integrated Graphics Controller (rev 12) (prog-if 00 [VGA controller])
Subsystem: Acer Incorporated [ALI] Device 031c
Flags: bus master, fast devsel, latency 0, IRQ 41
Memory at d0000000 (64-bit, non-prefetchable) [size=4M]
Memory at c0000000 (64-bit, prefetchable) [size=256M]
I/O ports at 3050 [size=8]
Expansion ROM at <unassigned> [disabled]
Capabilities:  MSI: Enable+ Count=1/1 Maskable- 64bit-
Capabilities: [d0] Power Management version 2
Capabilities: [a4] PCI Advanced Features
Kernel driver in use: i915
While I can not say this is the best or optimum driver, it does work with the Arrandale/Ironlake combination. There are boot and suspension considerations detailed here - The "Black Screen" on Boot .... a Surprise !.
[ 762.141] (II) LoadModule: "intel"
[ 762.141] (II) Loading /usr/lib64/xorg/modules/drivers/intel_drv.so
[ 762.142] (II) Module intel: vendor="X.Org Foundation"
[ 762.142] compiled for 184.108.40.2061, module version = 2.13.901
[ 762.142] Module class: X.Org Video Driver
[ 762.142] ABI class: X.Org Video Driver, version 8.0
[ 762.142] (II) intel: Driver for Intel Integrated Graphics Chipsets: i810,
i810-dc100, i810e, i815, i830M, 845G, 854, 852GM/855GM, 865G, 915G,
E7221 (i915), 915GM, 945G, 945GM, 945GME, Pineview GM, Pineview G,
965G, G35, 965Q, 946GZ, 965GM, 965GME/GLE, G33, Q35, Q33, GM45,
4 Series, G45/G43, Q45/Q43, G41, B43, B43, Clarkdale, Arrandale,
Sandybridge, Sandybridge, Sandybridge, Sandybridge, Sandybridge,
[ 762.142] (++) using VT number 7
The updated Xorg/intel drivers also appear to function with the (current) mainstream kernel (220.127.116.11-0.5). The 2.12 Intel drivers are partway there, and the 2.13 drivers seem to experience the power management problems associated with the "eDP" facility. This seems to only be an issue at boot-time, or susspension/hibernation from the Login screen.
The above environment is used only for testing, until driver nirvana is attained, hopefully beginning with 11.4.