OK, I have made some tests :
The 'Headphone Playback Volume' affect the headphone output.
The 'Master Mono Playback Volume' affect the internal loudspeaker.
The 'Master Playback Volume' affect only the external loudspeakers, but not
the internal loudspeaker and not the headphone output. The master playback
is usually general and must affect ALL outputs.
With ac97_codec oss driver from kernel 2.4.19-16mdk (mandrake 9) the
behavior is identical.
My desktop is a compaq 510FC evo.
here is the lspci -nvv :
00:1f.5 Class 0401: 8086:24c5 (rev 01)
Subsystem: 0e11:00ad
Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr-
Stepping- SERR- FastB2B-
Status: Cap+ 66Mhz- UDF- FastB2B+ ParErr- DEVSEL=medium >TAbort-
<TAbort- <MAbort- >SERR- <PERR-
Latency: 0
Interrupt: pin B routed to IRQ 5
Region 0: I/O ports at 2000 [size=256]
Region 1: I/O ports at 2400 [size=64]
Region 2: Memory at f8500400 (32-bit, non-prefetchable) [size=512]
Region 3: Memory at f8500600 (32-bit, non-prefetchable) [size=256]
Capabilities: [50] Power Management version 2
Flags: PMEClk- DSI- D1- D2- AuxCurrent=375mA
PME(D0+,D1-,D2-,D3hot+,D3cold+)
Status: D0 PME-Enable- DSel=0 DScale=0 PME-
>>>-----Message d'origine-----
>>>De : Takashi Iwai [mailto:[EMAIL PROTECTED]]
>>>Envoye : mardi 3 decembre 2002 11:52
>>>A : Hamel Gilles - Brandt Appliances
>>>Cc : [EMAIL PROTECTED]
>>>Objet : Re: [Alsa-user] Mixer problem on Intel 82801DB-ICH4
>>>
>>>
>>>At Tue, 3 Dec 2002 08:09:57 +0100,
>>>Hamel Gilles - Brandt Appliances wrote:
>>>>
>>>> $ cat /proc/asound/version
>>>> Advanced Linux Sound Architecture Driver Version 0.9.0rc6.
>>>> Compiled on Dec 2 2002 for kernel 2.4.18-3custom with
>>>versioned symbols.
>>>> $ cat /proc/asound/cards
>>>> 0 [82801DBICH4 ]: ICH - Intel 82801DB-ICH4
>>>> Intel 82801DB-ICH4 at 0xf8500400, irq 5
>>>>
>>>>
>>>> The sound works fine.
>>>>
>>>> However, I've noticed that the master volume control
>>>doesn't work at all (I
>>>> can change level, but
>>>> the sound's volume isn't affected).
>>>
>>>how is the headphone playback volume?
>>>some onboard chip wires this control as a master control.
>>>and it's difficult to know from the outside.
>>>
>>>if it's the case, please show the output of lspci -nvv for the chip.
>>>we can add a kind of quirk for this.
>>>
>>>
>>>Takashi
>>>
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