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Windows 7: Sony vaio Onboard HDMI audio auto-switching not working

08 Oct 2012   #1

Windows 7 Ultimate x64
Sony vaio Onboard HDMI audio auto-switching not working

after a fresh install of my windows 7 ultimate 64bit, the hdmi to onboard audio switching is not working automatically. this used to work in vista but not with Windows 7
i even updated the nvidia's latest driver (306.23) i tried many vga drivers and audio drivers nothing seems to be working, Sigmatel audio codec says hdmi not plugged in even though it is. high definition audio, working but every time i have to switch the sound manually in the playback devices( its a bit boring ) i can't find any solution for this and i thing someone out there must be known about this better than me, so please help me out to fix this. i'm using nvidia geforce 8400m gt GPU and
here is my sound hardware ids

My System SpecsSystem Spec


 Sony vaio Onboard HDMI audio auto-switching not working

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