On Wed, 2007-08-29 13:53:07 +0200, Clemens Ladisch <cladisch@xxxxxxxxxxxxxx> wrote:
> Jan-Benedict Glaw wrote:
> > On Tue, 2007-08-28 08:28:39 +0200, Clemens Ladisch <cladisch@xxxxxxxxxxxxxx> wrote:
> > > Jan-Benedict Glaw wrote:
> > > > jbglaw@d2:~$ amixer cset numid=35 off
> > > > numid=35,iface=MIXER,name='IEC958 In Monitor'
> > > > ; type=BOOLEAN,access=rw------,values=1
> > > > : values=on
> > > >
> > > > Seems it cannot change this control's value?
> > >
> > > Strange. Please show the contents of /proc/asounc/card0/cmipci.
> >
> > Since I just bought that card and never tested it somewhere else:
> > Could this just be a hardware problem / defect? From a look at the
> > driver's sources, it seems that this mixer element directly maps to
> > the low bit of CM_REG_MIXER1.
>
> Indeed. (This is why I asked for the cmipci file and not the cards
> file, to see how the mixer control affects this bit in register 0x24.)
I didn't (yet) check that card in a Windows machine to test it with
vendor's drivers, but I really guess it's kind of a hardware problem.
Just out of interest, I ordered another, similar card (Ultron
Octosound 7.1, lspci: "C-Media Electronics Inc CM8738 (rev 10)",
/proc/asound/cards: "C-Media PCI CMI8738-MC8 (model 68)")
Plugged all in, fired up speaker-test, everything seems to work right
out of the box.
Fired up an alsaplayer to play some FLAC. Switched on "Four Channel
Mode" for a test, which nicely adds sound to the rear left/right
outputs.
After the FLAC ended, I fired up speaker-test again (and of course
switched off "Four Channel Mode".) This time, it's different than
before: front center/LFE, front left/right and side left/right are
okay, but rear right/left are highly distorted.
Unloaded/loaded the module once, but that didn't fix it. Powercycle
(did also remove the power cord to really let it loss its power) fixed
it. So I guess there's still a state-handling problem somewhere?
Ran another test, right after another power-cycle:
* speaker-test -twav -Dplug:surround71 -c8
-> All okay.
* alsamixergui &
* speaker-test -twav -Dplug:surround71 -c8
-> All okay.
* alsaplayer 04_my_immortal.flac (for some seconds, Ctrl-C'ed out)
-> Plays fine
* speaker-test -twav -Dplug:surround71 -c8
-> Distorted sound on both rear {left,right} speakers. All
other channels are still okay.
Maybe that rings a bell somewhere?
MfG, JBG
--
Jan-Benedict Glaw jbglaw@xxxxxxxxxx +49-172-7608481
Signature of: Fortschritt bedeutet, einen Schritt so zu machen,
the second : daß man den nächsten auch noch machen kann.
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