Take a look at this thread Intel Graphics Drivers ... in particular post #6, #10, #11 and #26 of mine.
Now in the OSS repository is the 'stock' xorg-x11-driver-video-7.6-52.4 which was updated to xorg-x11-video-7.6-53.56.1 (which is flagged as 'i' in the zypper search results you provided). If you read those posts in the thread I asked you to look at you will see in post#26 that the updated xorg-x11-video-7.6-53.56.1 rpm offers:
and it explains how to get that information. So there were some Sandybridge updates in the latest xorg-x11-driver-video rpm, which however does NOT include the Intel 2.15 driver.
Distribution: openSUSE 11.4
* Fri Apr 15 2011 sndirsch-at-novell.com
* fixes partial screen distortion on Sandybridge visible in KDE
(bnc #680921, bfo #35808)
* Wed Apr 13 2011 James.Bottomley-at-suse.de
* upstream commit da990536eca09c6de74627541cd56ecfad925eda
uxa: Undo damage translation before appending
* our bugzilla 666704
* freedesktop bugzilla https://bugs.freedesktop.org/show_bug.cgi?id=32734
If it were me, and I wanted to update to the Intel-2.15 driver, I would check the tumbleweed on openSUSE and see if the tumbleweed repository
has the latest xorg-x11-driver-video rpm and check if it has the Intel-2.15 driver.
Unfortunately that driver is NOT there yet, so if you want to try the Intel-2.15 you would need to take a risk with the possibly unstable X11 repository for openSUSE-11.4
and I know from experience that sometimes rpms from that repository will irreparably break one's install, requiring a complete re-install, so one takes their chances.
As I noted in the quoted thread above that the X11 repository does have an rpm with that 2.15 Intel driver.
Don't forget, when brushing up on one's basic openSUSE GNU/Linux graphic card practical theory to look at this guide (especially the various links in the index) : openSUSE Graphic Card Practical Theory Guide for Users
The fact IMHO is GNU/Linux ALWAYS lags MS-Windows SIGNIFICANTLY for video drivers, and the GNU/Linux Intel graphic drivers are significantly late in coming and what you are seeing with your relatively new hardware is a symptom of that. IMHO thats the simple bad news that comes with being a GNU/Linux user.
Please don't shoot the messenger here.