ever have trouble with headphone recognition?

[Paul Johnson]

This is a laptop computer.  I thought that was obvious when I said it
is a laptop.  The built in speakers are not "plugged in" to the back.
Did I mention this is a laptop?

pj

On 6/20/06, Jeff Vian <jvian10 at charter.net> wrote:
> On Mon, 2006-06-19 at 23:23 -0600, Paul Johnson wrote:
> > I have a Dell Latitude D820 and in order to make sound work at all, I
> > had to install the newer Alsa drivers & utilties as described on the
> > RedHat help site.
> > http://people.redhat.com/stransky/alsa/
> >
> > This laptop has an Intel southbridge architecture that uses the driver
> > snd-hda-intel.
> >
> > Here is the problem.  If the laptop starts and no headphones are
> > plugged in, then inserting the headphones does nothing--sound keeps
> > coming out from speakers.
> >
> > Conversely, if  I put in the headphones before starting the comptuer,
> > then the headphones do work, but yanking them does not make the
> > speakers work.
> >
> I am not sure what you mean here about speakers and headphones.  On my
> systems the speakers (front/stereo) plug into the same jack as the
> headphones on the rear.  If the speakers work then the headphones will
> work.
>
> If, on the other hand, you are using the speakers in the rear jack and
> plugging the headphones in the front jack then this may be an issue with
> the way the front panel audio is connected to the audio ports on the
> mobo.  With a front panel properly connected it should not matter.  The
> front panel jack will disable the rear jack when plugged in, but should
> never depend on which is connected at boot time to determine which is
> enabled.
>
> > The alsa mixer does not show the headphones device, at all. None of
> > the gnome mixer tools   or kde mixer tools show more devices.
> >
> Nothing I know of explicitly lists the headphone device.  It is after
> all a speaker set and plugs into the same jack on the sound card.
> Some have had problems with the external speakers never working.
>
> One thing I have found and has been repeated here by many is that there
> is an "external amplifier" switch in the alsa volume control panel.
> Sometimes this is off and the speakers will not work so turning it on
> enables the speakers. This does not seem to be what you describe
> however.
>
> >From reading the way you describe it I suspect the problem with cabling
> for the front panel audio, but only you can answer that.
>
> > I've stumbled throught a lot of Alsa documentation and there is a hint
> > that specifying the model= option in  modules.conf might help, but I
> > don't understand the jargon for figuring out what model I have.  They
> > offer weird names like "3stack" and such.  Do you know what model to
> > use?  Here's all the info I have:
> >
> > # aplay -l
> > **** List of PLAYBACK Hardware Devices ****
> > card 0: Intel [HDA Intel], device 0: STAC92xx Analog [STAC92xx Analog]
> >   Subdevices: 1/1
> >   Subdevice #0: subdevice #0
> > card 0: Intel [HDA Intel], device 1: STAC92xx Digital [STAC92xx Digital]
> >   Subdevices: 1/1
> >   Subdevice #0: subdevice #0
> >
> > # cat /proc/asound/cards
> >  0 [Intel          ]: HDA-Intel - HDA Intel
> >                       HDA Intel at 0xdfffc000 irq 21
> >
> >
> > # /sbin/lspci -vv
> >
> > ....
> > 00:1b.0 Audio device: Intel Corporation 82801G (ICH7 Family) High
> > Definition Audio Controller (rev 01)
> >         Subsystem: Dell Unknown device 01cc
> >         Control: I/O- Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop-
> > ParErr- Stepping- SERR+ FastB2B-
> >         Status: Cap+ 66MHz- UDF- FastB2B- ParErr- DEVSEL=fast >TAbort-
> > <TAbort- <MAbort- >SERR- <PERR-
> >         Latency: 0, Cache Line Size 10
> >         Interrupt: pin A routed to IRQ 21
> >
> >         Interrupt: pin A routed to IRQ 21
> >         Region 0: Memory at dfffc000 (64-bit, non-prefetchable) [size=16K]
> >         Capabilities: [50] Power Management version 2
> >                 Flags: PMEClk- DSI- D1- D2- AuxCurrent=55mA
> > PME(D0+,D1-,D2-,D3hot+,D3cold+)
> >                 Status: D0 PME-Enable- DSel=0 DScale=0 PME-
> >         Capabilities: [60] Message Signalled Interrupts: 64bit+
> > Queue=0/0 Enable-
> >                 Address: 0000000000000000  Data: 0000
> >         Capabilities: [70] Express Unknown type IRQ 0
> >                 Device: Supported: MaxPayload 128 bytes, PhantFunc 0, ExtTag-
> >                 Device: Latency L0s <64ns, L1 <1us
> >                 Device: Errors: Correctable- Non-Fatal- Fatal- Unsupported-
> >                 Device: RlxdOrd- ExtTag- PhantFunc- AuxPwr- NoSnoop+
> >                 Device: MaxPayload 128 bytes, MaxReadReq 128 bytes
> >                 Link: Supported Speed unknown, Width x0, ASPM unknown, Port 0
> >                 Link: Latency L0s <64ns, L1 <1us
> >                 Link: ASPM Disabled CommClk- ExtSynch-
> >                 Link: Speed unknown, Width x0
> >         Capabilities: [100] Virtual Channel
> >         Capabilities: [130] Unknown (5)
> > ...
> >
> >
> >
> >
> > --
> > Paul E. Johnson
> > Professor, Political Science
> > 1541 Lilac Lane, Room 504
> > University of Kansas
> >
>
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-- 
Paul E. Johnson
Professor, Political Science
1541 Lilac Lane, Room 504
University of Kansas