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The GMA 3150 graphic chip, as other similar graphics chip, are integrated into Atom processor and not are stand-alone products that have specific datasheet.
You can find some (minimal) information on Atom's datasheet.
For GMA3150 look at Atom d400/ d500 series that are the processors that integrates it.
For some registry specific look at:
thank you so much , it was so kind of you to provide me with those links ,
well my bad i didnt follow up with technologies since long time i didnt knw that intel GPUs dont come standalone anymore , i will check them out and i hope i find the graphics configuration registers
thanks again and accept my gratitude