Arch Linux

heleos

Member

From: Maine, USA

Registered: 2007-04-24

Posts: 678

[SOLVED] Completely muted left channel in alsa

I reinstalled arch last night, and now I can't get my sound working correctly anymore. It worked fine before the reinstall, so I'm hoping its just a config problem somewhere.

I have an Maudio Revolution 5.1, running alsa, using snd-ice1724
When I boot up, Sound only comes from the right speaker. I know of the bug with alsa that has the left channel muted on boot, and a simple toggle of a mixer would fix the problem, but it's not, it seems like my speaker is permanently muted. I cannot toggle mute/unmute because it's not accepted in alsamixer.

I know this isn't a hardware problem because if I move my speakers around, the right channel is muted.

Last edited by heleos (2008-07-11 18:21:48)

Factory

Member

Registered: 2008-02-24

Posts: 108

Re: [SOLVED] Completely muted left channel in alsa

This will sound really dumb, but are your speakers plugged in all the way? A friend of mine lived with only his right channel for 2 months before he realized they weren't plugged in all the way.

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heleos

Member

From: Maine, USA

Registered: 2007-04-24

Posts: 678

Re: [SOLVED] Completely muted left channel in alsa

Unfortunately they are

z0phi3l

Member

From: Waterbury CT

Registered: 2007-11-26

Posts: 278

Re: [SOLVED] Completely muted left channel in alsa

Are all the volume settings unmuted? Some sound cards have separate sliders for L,R, Center, Bass, etc.

heleos

Member

From: Maine, USA

Registered: 2007-04-24

Posts: 678

Re: [SOLVED] Completely muted left channel in alsa

As far as I know they are. ice1724 doesn't allow muting of PCM, which is what it uses for the main sound

heleos

Member

From: Maine, USA

Registered: 2007-04-24

Posts: 678

Re: [SOLVED] Completely muted left channel in alsa

shameless bump... (and a better title)

Stythys

Member

From: SF Bay Area

Registered: 2008-05-18

Posts: 878

Website

Re: [SOLVED] Completely muted left channel in alsa

run 'alsamixer' and make sure none of the settings have "OM" or "MO" instead of "OO". Use the ">" key to toggle it

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heleos

Member

From: Maine, USA

Registered: 2007-04-24

Posts: 678

Re: [SOLVED] Completely muted left channel in alsa

They don't.

here's a horrible copy/paste from alsamixer:

┌──────────────────[AlsaMixer v1.0.16 (Press Escape to quit)]──────────────────┐
│ Card: M Audio Revolution-5.1                                                 │
│ Chip: ICE1724 - multitrack                                                   │
│ View: [Playback] Capture  All                                                │
│ Item: PCM [dB gain=-13.50, -13.50]      
│                                                                              │
│    ┌──┐     ┌──┐      ┌──┐     ┌──┐     ┌──┐      ┌──┐     ┌──┐              │
│    │  │     │  │      │  │     │  │     │▒▒│      │▒▒│     │▒▒│              │
│    │  │     │  │      │  │     │  │     │▒▒│      │▒▒│     │▒▒│              │
│    │▒▒│     │▒▒│      │▒▒│     │▒▒│     │▒▒│      │▒▒│     │▒▒│              >
│    │▒▒│     │▒▒│      │▒▒│     │▒▒│     │▒▒│      │▒▒│     │▒▒│              >
│    │▒▒│     │▒▒│      │▒▒│     │▒▒│     │▒▒│      │▒▒│     │▒▒│              >
│    │▒▒│     │▒▒│      │▒▒│     │▒▒│     │▒▒│      │▒▒│     │▒▒│              >
│    │▒▒│     │▒▒│      │▒▒│     │▒▒│     │▒▒│      │▒▒│     │▒▒│              >
│    │▒▒│     │▒▒│      │▒▒│     │▒▒│     │▒▒│      │▒▒│     │▒▒│              >
│    │▒▒│     │▒▒│      │▒▒│     │▒▒│     │▒▒│      │▒▒│     │▒▒│              │
│    │▒▒│     │▒▒│      │▒▒│     │▒▒│     │▒▒│      │▒▒│     │▒▒│              │
│    │▒▒│     │▒▒│      │▒▒│     │▒▒│     │▒▒│      │▒▒│     │▒▒│   PCM Out    │
│    └──┘     └──┘      └──┘     └──┘     └──┘      └──┘     └──┘              │
│                                                                              │
│                                                                         
│   79<>79     80        80     80<>80  100<>100  100<>100 100<>100            │
│ <  PCM   >PCM Cent  PCM LFE  PCM Rear Line Loo  CD Loopb Mic Loop  IEC958

PCM is the channel I used to toggle to get sound working in both speakers.

Last edited by heleos (2008-07-10 20:39:48)

heleos

Member

From: Maine, USA

Registered: 2007-04-24

Posts: 678

Re: [SOLVED] Completely muted left channel in alsa

I found them problem...

revo 5.1 has a bunch of channels toward the end of alsamixer:

[H/W] [H/W 1] [H/W 2] [H/W 3] [H/W 4] [H/W 5]

A couple of them were set to "IEC958 In L" or "IEC958 In R"

I set them all to "PCM OUT" and sound comes out of both speakers... but it sounds a little bad. Does anyone have these channels in their alsamixer, and if so, could you post what you have for values? I'm guessing its a combination of L and R instead of all PCM OUT