No surround with Realtek HD and Win7 - an answer?

No 5.1 sound, only 2 channel stereo. I think I know what's going wrong, but who will fix it? Shared mode is probably the culprit. Read on ...
I have Slimline S3750F with RealTek HD (chipset ACS888). I did a clean install of Win7-64 over Vista and now rear channels don't work. I tried both the "original" driver (6.0.1.5882) and the latest for Win7 (6.0.1.5910), both have same problem. When I run the troubleshooters, it only shows a pair of front speakers and that is all the troubleshooterrs will play through. Well, isn't that stupid?
The control panel device manager driver page for the device can actually display a far more useful test. This test allows me to select S/PDIF, click the test button and .... it plays sound thru ALL FIVE sppeakers, one at a time.
Well alright, so how come the more user friendly troubleshooters think they can only play thru 2 front speakers? I think the reason is that the system thinks the device is being used in shared mode, and in this mode, only 2 channel audio is allowed. Well, if this is the problem, it's obvious that someone screwed up for Win7 release. There ought to be a way for an application to get exclusive use of the device, and then 5.1 sound is possible.
BTW, the troubleshooting guides in this forum are inapplicable, because I have hooked up to S/PDIF and all guides assume you've hooked up direct to speakers. And others have noted that the oft-mentioned folder icon for autojack doesn't appear for many of us.

Looks like I accidentally double posted, I've got almost the same exact problem.  
"The control panel device manager driver page for the device can actually display a far more useful test. This test allows me to select S/PDIF, click the test button and .... it plays sound thru ALL FIVE sppeakers, one at a time."
I'm not sure which test area you using, but try right clicking the speaker on the task bar and go to "playback devices -> Realtek Digital Output properties -> Supported Formats", then try doing the dts and dolby digital tests (assuming your receiver supports them).  Mine plays exactly how it should when I do that; unfortunately, that's the only time it does.
Check my post, see if any of it looks familiar:
http://h30434.www3.hp.com/t5/Desktop-PC-Sound-and-Audio/realtek-optical-5-1-not-working/td-p/198689
This problem is making me pull my hair out...

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