[Windows Phone 7 Development and Hacking] marsrogers:
We all remember at the MIX10 Joe Belfiore projects his phone onto the big screen. Even on the recent XBOX show he did that again.

http://www.youtube.com/watch?v=9IA28wRWAI8

http://www.youtube.com/watch?v=uCDXaJh4bwE

this kind of video out is through micro-usb, normal type one. You can find Joe is using a Lumia 800 in his hand in the XBOX video.

I asked him through twitter and received an answer of "Special Software build".

I did some research and dig into the register keys. Found something.

This is a special driver that only shared inside the MS and normally won't be out anytime soon.

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（Deleted because they are no longer of any means）

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----Update on 2012.Feb 9 China Time----

----Update on 2012.Feb 9 23:00 China Shanghai Time----

Today I really thank @GoodDayToDie and @ultrashot for helping so many.

@ultrashot sent me a xap app that does the job, calling the changusbprofile.exe in Windows folder. Although result is the same with yesterday, but now I am more sure that we are one more step closer to our destination. I'll wait my new micro usb cables to arrive and then I'll make a second try. Thank you again!!! Can't reach here without you kind people~~~

----Update on 2012.Feb 10 19:22 China Shanghai Time----

I removed the attachments because the project is now on special stage. I will put them back after the feature works, or after I can't make it work. Either way, I will put them back~~~Don't worry.

----Update on 2012.Feb 12 15:22 China Shanghai Time----

Complete failure....:(

New cable arrived and still my computer can't recognize the phone in usb video out mode...I changed a computer and till the same...

Will think about next steps...if I can't make figure it out next week, I shall put everything at present stage onto here.

----Update on 2012.Feb 14 10:22 China Shanghai Time----

Think it over, and think there is still a hill in front of us. The changeusbprofile.exe seems just to be a toggle, like a shortcut. But the real port of usb video out hasn't been enabled. On my samsung focus, I checked the *#7284# in Diagnosis Mode before and after I ran the changeusbprofile. The thing changes from Zun to Tethering, while it's not the real tethering mode. I think the changeusbprofile is just doing a job like changing usb mode from zune to tethering or to Diag mode. So that's to say, we haven't really seen the iceberg yet. I'll keep finding and hoping that anyone can get any help on this. This may requires me to dig some post in Windows Mobile age, since some parts between the two system are same.

And I contacted the kind secret person, and get the news that the usb cable doesn't really matters. Any short cables should serve the job. So our attention should move back onto the phone again.

----Update on 2012.Feb 15 15:13 China Shanghai Time----

I figured it out~The changeusbprofile changes the value in Registry Local_Machine/Drivers/USB/FunctionDrivers, DefaultClientDriver=CompositeFn to UFN_VIDSTREAM_CLASS. Every value change here points to a folder in FunctionDrivers.

in Samsung Focus, it is like below:

/CompositeFn;

/CompositeFn_QCOM;

/CompositeFn_SAMSUNG;(This is the one when we choose Diag Mode in Diagnosis App *#7284#)

/MtpClientDrvUsb;

/Samsung_USBSER_Modemlink;

/Serial_Class;

/Serial_Class_Diag_Qcom;

/Serial_Class_Nmea_Qcom;

/Serial_Class_Trace_Qcom;

/USBSER_Class;

/USBSER_Modemlink_Qcom;

There is no UFN_VIDSTREAM_CLASS folder here, so that explains why the changeusbprofile works well while it is no use at all...

Next step, I will try looking for the Setting in Asus E600, if I can find someone who has this device. Maybe Samsung Taylor will do the same.

If you can help, don't hesitate~~

----Update on 2012.Mar 3 15:13 China Shanghai Time----

----Update on 2012.Mar 6 1:02 China Shanghai Time----

Project suspended, cuz according to a source, WP8 will have Remote desktop support.

The source is quite trustful, and I have no reason to doubt that.

So just be patient, and it will come. No need for this project to keep going.

At last, use my words in the email I talked with the source.

---Update on 2012.August 17 14:21 China Shanghai Time---

Good luck!~

--Update on 2012.August 20 22:37 China Shanghai Time--

--Update on 2012.August 23 17:42 China Shanghai Time--

--Update on 2012.August 28 19:43 China Shanghai Time--