[hsflinux] Strange interaction with hsf drivers and ALSA PCM

Linuxant support (Jonathan) support at linuxant.com
Wed Sep 1 13:54:21 EDT 2004


you can disable the audio output of the modem driver through your sound 
card with the following command in a root shell :

touch /etc/hsfmodem/nodcpaudio

This is probably fix the 3 problems you have with the modem driver.


Technical specialist / Linuxant
support at linuxant.com

Josh Green wrote:
> Since upgrading to the latest Linuxant drivers I've been noticing some
> strange interaction between the modem and my sound card output.
> The first issue is if I start connecting to the Internet and then press
> play on XMMS while the modem is connecting, XMMS will be blocked until
> the modem is done connecting, at which point the song will start to
> play. I'm using the OSS emulation interface to ALSA with XMMS. I usually
> experience this type of behavior when trying to open the PCM output of
> my sound card with multiple applications, but I wouldn't expect the HSF
> drivers to also use this PCM interface.
> The second problem I experience is that sometimes between songs in XMMS
> I will get a blast of modem on the PCM output if I'm currently
> connected.
> Another thing I've noticed (though not really that big of a deal) is
> that when first connecting I hear voices on the line. I was guessing
> that perhaps this is some radio reception on the phone line prior to the
> current loop being created (maybe the speaker is being enabled too
> early?)
> Anyways, just thought I'd post those issues. Cheers.
> 	Josh Green
> P.S. here are some details of my system:
> Gentoo (Base System version 1.4.16)
> Linux Kernel 2.6.7-gentoo-r11
> ALSA 1.0.5a
> GCC 3.3.3-r6
> 0000:00:1f.5 Multimedia audio controller: Intel Corp. 82801DB/DBL/DBM
> (ICH4/ICH4-L/ICH4-M) AC'97 Audio Controller (rev 01)
>         Subsystem: Dell: Unknown device 015f
>         Flags: bus master, medium devsel, latency 0, IRQ 7
>         I/O ports at b800
>         I/O ports at bc40 [size=64]
>         Memory at f4fff800 (32-bit, non-prefetchable) [size=512]
>         Memory at f4fff400 (32-bit, non-prefetchable) [size=256]
>         Capabilities: [50] Power Management version 2
> 0000:00:1f.6 Modem: Intel Corp. 82801DB/DBL/DBM (ICH4/ICH4-L/ICH4-M)
> AC'97 Modem Controller (rev 01) (prog-if 00 [Generic])
>         Subsystem: Conexant: Unknown device 5422
>         Flags: bus master, medium devsel, latency 0, IRQ 7
>         I/O ports at b400
>         I/O ports at b080 [size=128]
>         Capabilities: [50] Power Management version 2
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