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

[Randy Li]

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? 2014?02?03? 19:07, Takashi Iwai ??:
> At Mon, 3 Feb 2014 15:01:00 +0800, Randy Li wrote:
>> 
>> 
> 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.
> 
>> HD-audio front panel should be connected in HD-audio mode. 
>> Otherwise something must go wrong.
> 
But I can't, the hardware of font port is a AC97 port, not a HD-audio one.
And as I have mentioned before, in BIOS, there is no such option to
switch the font port mode between HD-audio nor AC97.
In windows, you have to do that with driver's control panel.
> 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?
> 
>> You need to switch to HD-audio mode, at first.
> 
> 
>> Takashi
> 
> Kernel is 3.4.77
> 
> 
> ayaka
>> 
> 
> 
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