[pulseaudio-discuss] Configuration problems with ALC888 on Zotac H55-ITX-C-E

[Andrej Podzimek]

Hello,

I am not sure whether the following problem is related to PulseAudio or bare ALSA. ;-) On my snd_hda_intel card with a Realtek chipset mentioned in the subject, I have the following issues:

	1) The channels/connectors mapping seems to be wrong. With the model=auto mode, the configuration is as follows:

		Channel		Connector
		-------------------------
		Front		Front (green) and Rear (black)
		Rear		Middle (orange) <- stereo output, surprisingly; doesn't sound like center/subwoofer
		OFF		Side/Line in (blue)
		Microphone	Microphone (pink)

		I tried model=6stack-dig, but the configuration did not change much:

		Channel		Connector
		-------------------------
		Front		Front (green)
		Rear		Middle (orange) <- stereo output, surprisingly; doesn't sound like center/subwoofer
		OFF		Side/Line in (blue), Rear (black)
		Microphone	Microphone (pink)

		There are incredibly many model options... http://git.alsa-project.org/?p=alsa-kmirror.git;a=blob;f=Documentation/HD-Audio-Models.txt;h=bda546928a427c4046cec48eb2859a7a8cff24c8;hb=HEAD None of them seems to match my hardware exactly.

		With 6stack-dig, one can swithch to 8-channel mode in alsamixer, which is impossible in the automatic mode. However, this does not explain why PulseAudio switches to 8-channel mode for some users and keeps the 6-channel mode for others. All users have the same 4.0 surround setup configured. What could be causing PulseAudio to decide about 6/8 channel mode?

		According to the motherboard's manual http://downloads.zotac.com/mediadrivers/mb/man/pa146.pdf, the 8-channel mode should yield a standard configuration using all the five conectors: front (green), side (blue), rear (black), center/subwoofer (orange). This is obviously not the case (as noted above). (There are two more connectors somewhere on the mainboard, but I don't have a front pannel installed, so the cannot be accessed. Perhaps the side speakers could be mapped to one of them...?)

	2) Consequently, I can neither play 7.1 audio, nor use my soundcard as 3 separate stereo cards. As for the latter case, I tried this:

		load-module module-remap-sink sink_name=Monitor remix=no master=alsa_output.pci-0000_00_1b.0.analog-surround-71 channels=2 master_channel_map=front-left,front-right channel_map=front-left,front-right
		load-module module-remap-sink sink_name=Headphones remix=no master=alsa_output.pci-0000_00_1b.0.analog-surround-71 channels=2 master_channel_map=rear-left,rear-right channel_map=front-left,front-right
		load-module module-remap-sink sink_name=HiFi remix=no master=alsa_output.pci-0000_00_1b.0.analog-surround-71 channels=2 master_channel_map=side-left,side-right channel_map=front-left,front-right

		Well, presumably, this is how it worked:
			Monitor played through the front (green) jack with model=6stack-dig and through both front (green) and rear (black) jacks with model=auto.
			Headphones played through the center/subwoofer (orange) jack in both modes.
			HiFi did not play anywhere.

Is it possible to configure this card for 7.1 audio or as three separate stereo cards?

A line from lspci:
	00:1b.0 Audio device: Intel Corporation 5 Series/3400 Series Chipset High Definition Audio (rev 06)

My audio configuration in modprobe.conf:
	options snd_hda_intel index=0
	options snd_usb_audio index=2
	options snd slots=snd_hda_intel,snd_hda_intel,snd_usb_audio
	options snd_hda_intel model=6stack-dig

Just about any hint would be very helpful. :-)

Andrej

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