Re: CMI8738 sound card - cannot hear sound in Lenny - SOLVED
On Saturday 17 January 2009 16:37, Robert Canner wrote:
> On Sat, 2009-01-17 at 00:07 +0100, Nigel Henry wrote:
> > On Friday 16 January 2009 22:04, Robert Canner wrote:
> > > I've unmuted the Synth control in alsamixer, but I still can't hear any
> > > sound :-(
> > >
> > > Alsamixer now shows:
> > > Master = 100,100 (but no mute/unmute box is shown)
> > > 3D Control = unmuted
> > > PCM, Synth, Line, CD, Aux = 100,100, unmuted
> > > Line-In = Rear Output
> > > Mic = 0, muted
> > > Mic Boost = muted
> > > Phone, PC Speaker = 100, unmuted
> > > IEC958 {5V, Copyright, In Monitor,
> > > In Phase Inverse, In Select, In Valid, Loop,
> > > Mix Analog, Output} = unmuted
> > > Exchange DAC, Four Channel Mode = unmuted
> > >
> > > By the way, alsamixer is not displaying any mute/unmute box for the
> > > Master control. Should I worry about this?
> >
> > No. My alsamixer on lenny shows no mute/unmute box, but it's a different
> > soundcard (Audigy2 soundblaster), and my alsamixer version shows as
> > 1.0.16. My alsa-utils package is 1.0.16-2, and that provides alsamixer,
> > and other stuff.
> >
> > > (By comparison, the Wikipedia screenshot
> > > http://en.wikipedia.org/wiki/File:Alsamixer.png shows a mute/unmute box
> > > for the Master control. My Lenny box is using alsamixer v1.0.13.)
> >
> > That .png for alsamixer on the wiki is for a different soundcard than
> > yours, and all alsamixer controls are different, depending on your
> > soundcard, so I'd ignore that.
> >
> > It doesn't help that I'm unfamiliar with your C media soundcard, so I'm a
> > bit in the dark. Are there any switches showing on your alsamixer? For
> > example on mine for the audigy2 soundblaster card there is a switch to
> > change from analogue to digital output. If this is set to digital, I get
> > no sound, but toggling it to analog brings the sounds up.
> >
> > Perhaps you could post the output from running amixer on the CLI, just to
> > see what controls you have available.
> >
> > Someone else who is also using a C media card on Lenny, may also have
> > some suggestions, that may resolve your problem.
> >
> > Alternatively, there is the alsa-user mailing list, and someone there may
> > have specific knowledge of known problems, and fixes for your card.
> >
> > All the best.
> >
> > Nigel.
>
> Thanks Nigel, your clue about switches in alsamixer has done the trick.
>
> I tried the following changes, testing each with speaker-test:
> mute '3D Control' -- still no sound
> change 'Line-In Mode' to 'Line In' -- still no sound
> mute 'Exchange DAC' -- pink noise heard on earphones :-)
>
> At this stage, CD playback was audible, but highly distorted. Curious
> about 'Exchange DAC', I Googled and found
> https://www.linuxquestions.org/questions/linux-hardware-18/c-media-cmi8738-
>chipset-no-sound-267807/ which also mentioned deselecting 'IEC958 Output'.
> So in alsamixer I tried muting 'IEC958 Output', which removed the
> distortion. Brilliant!
>
> For the record, here's my amixer output after fixing the problem:
<snip>
> Once again, many thanks,
> Robert
Hi Robert.
Great that the problem is resolved, and happy to have helped. Keep a written
note of the fixes, as you may need them again.
All the best, and enjoy the sounds.
Nigel.
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