[alsa-devel] Strange sound of IDT 82hd206xx6 at font port in AC97 mode

[Randy Li]

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Hello
My mainboard is ECS A780GM-A, the sound chip in it is IDT 82HD206XX6, it
shows that below
00:14.2 Audio device: Advanced Micro Devices [AMD] nee ATI SBx00 Azalia
(Intel HDA)
        Subsystem: Elitegroup Computer Systems Device 2816
        Control: I/O- Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop-
ParErr- Stepping- SERR- FastB2B- DisINTx-
        Status: Cap+ 66MHz- UDF- FastB2B- ParErr- DEVSEL=slow >TAbort-
<TAbort- <MAbort- >SERR- <PERR- INTx-
        Latency: 64, Cache Line Size: 64 bytes
        Interrupt: pin A routed to IRQ 16
        Region 0: Memory at f9ff0000 (64-bit, non-prefetchable) [size=16K]
        Capabilities: [50] Power Management version 2
                Flags: PMEClk- DSI- D1- D2- AuxCurrent=55mA
PME(D0+,D1-,D2-,D3hot+,D3cold+)
                Status: D0 NoSoftRst- PME-Enable- DSel=0 DScale=0 PME-
        Kernel driver in use: snd_hda_intel

In my bios I don't have a switch to make the font port mode into AC97 or
HD Audio.
In windows you need to install a driver and set the font port into AC97.
In Linux, you can use the font port, but it seems that audio channel is
wrong, I can't hear the sound in some part of a film and I can hear the
stranger accent of sound in the other part of a film(or a music). But
all the 7.1 channel in the back ports can output the sound match my
mircophone(all are the same).
How to fix the problem?
Kernel is 3.4.77


ayaka
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