[Bluez-users] strange btsco error

[Bluez-users] strange btsco error

[Florian Echtler]

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Hello everyone,

I was trying to get my BT headset running with btsco today.
This has the following result:

[root@block:/usr/src/btsco-20040219][0] $ ./btsco 00:0D:FD:.....
Device is 2:0
Error: btsco open (2-0): No such device or address

[root@block:/usr/src/btsco-20040219][255] $ 

The same happens with btsco2 after a short pause, in which a
connection seems to be established for a moment (BTW, what's
the difference between btsco and btsco2?).

Obviously, the error happens in snd_hwdep_open(), and a bit of
digging showed that the real troublemaker is some alsa-lib sub-
routine called snd_config_search_alias_hooks(). I know that
this therefore is primarily an ALSA error, but maybe one of the
authors of btsco has an idea anyway? Do I need some additional
ALSA configuration to use this?

Thanks in advance,
Yours, Florian
- -- 
Preserve wildlife - pickle a squirrel today!
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[Bluez-users] Re: strange btsco error

[Sebastian Roth]

Hi Florian!

 > [root@block:/usr/src/btsco-20040219][0] $ ./btsco 00:0D:FD:.....
 > Device is 2:0
 > Error: btsco open (2-0): No such device or address
Is your headset in the list of ALSA devices and the ALSA soundsystem
started? (cat /proc/asound/cards)

 > BTW, what's the difference between btsco and btsco2?
Have a look at the source :-)

Best regards,
Sebastian



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Re: [Bluez-users] Re: strange btsco error

[Florian Echtler]

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> > [root@block:/usr/src/btsco-20040219][0] $ ./btsco 00:0D:FD:.....
> > Device is 2:0
> > Error: btsco open (2-0): No such device or address
> Is your headset in the list of ALSA devices and the ALSA soundsystem
> started? (cat /proc/asound/cards)

1. No, it isn't. However, this should not matter, as I stated that this
   error happens _before_ any bluetooth specific code is executed, in
   btsco.c, line 356: snd_hwdep_open().

2. cat /proc/asound/cards:

0 [CK8            ]: NFORCE - NVidia CK8
                     NVidia CK8 with ALC650F at 0xe8000000, irq 21
1 [U0x46d0x8b0    ]: USB-Audio - USB Device 0x46d:0x8b0
                     USB Device 0x46d:0x8b0 at usb-0000:00:02.0-2.4, full speed
2 [Headset        ]: Bluetooth SCO - BT Headset
                     BT Headset 1

Yours, Florian
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Preserve wildlife - pickle a squirrel today!
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[Bluez-users] Re: strange btsco error

[Sebastian Roth]

Hi Florian,

I think your answer is a bit confusing.

> 1. No, it isn't. However, this should not matter, as I stated that this
>    error happens _before_ any bluetooth specific code is executed, in
>    btsco.c, line 356: snd_hwdep_open().
> 
> 2. cat /proc/asound/cards:
> 
> 0 [CK8            ]: NFORCE - NVidia CK8
>                      NVidia CK8 with ALC650F at 0xe8000000, irq 21
> 1 [U0x46d0x8b0    ]: USB-Audio - USB Device 0x46d:0x8b0
>                      USB Device 0x46d:0x8b0 at usb-0000:00:02.0-2.4, full speed
> 2 [Headset        ]: Bluetooth SCO - BT Headset
>                      BT Headset 1

As your output of 2. shows it _is_ in the list. That's good!

I found a thread in the mailing list:
http://thread.gmane.org/gmane.linux.bluez.devel/4000

Are you able to open the device using alsamixer as suggested by Lars
Grunewaldt?

Best regards,
Sebastian




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Re: [Bluez-users] Re: strange btsco error

[Florian Echtler]

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> I found a thread in the mailing list:
> http://thread.gmane.org/gmane.linux.bluez.devel/4000
> Are you able to open the device using alsamixer as suggested by Lars
> Grunewaldt?
Yes, that works. The ALSA device exists and can be opened, however (as I
already stated twice now) the error is somewhere in the HwDep part of 
alsa-lib. After reading the above thread, it seems to me that not using
the separate alsa-drivers, but those in the kernel, might be a solution.

Any experiences with that? Better kernel ALSA or standalone ALSA?

Yours, Florian
- -- 
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Re: [Bluez-users] Re: strange btsco error

[Florian Echtler]

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> Any experiences with that? Better kernel ALSA or standalone ALSA?

Well, I solved that one by myself (see also 
http://thread.gmane.org/gmane.linux.bluez.devel/3790). Obviously,
kernel ALSA is necessary (I'm using 2.6.10-mh2).

Two things therefore:
1. the B-Speech Elect Headset works fine (now ;)
2. on the bluetooth-alsa site, you should really mention that external
   ALSA drivers (at least 1.0.8) won't work! (as already asked for in 
   the above thread)

Yours, Florian
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Preserve wildlife - pickle a squirrel today!
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Re: [Bluez-users] Re: strange btsco error

[Brad Midgley]

Florian,

I added a note about kernel alsa to the docs at bluetooth-alsa.sf.net

Brad

Florian Echtler wrote:
> -----BEGIN PGP SIGNED MESSAGE-----
> Hash: SHA1
> 
> 
>>Any experiences with that? Better kernel ALSA or standalone ALSA?
> 
> 
> Well, I solved that one by myself (see also 
> http://thread.gmane.org/gmane.linux.bluez.devel/3790). Obviously,
> kernel ALSA is necessary (I'm using 2.6.10-mh2).
> 
> Two things therefore:
> 1. the B-Speech Elect Headset works fine (now ;)
> 2. on the bluetooth-alsa site, you should really mention that external
>    ALSA drivers (at least 1.0.8) won't work! (as already asked for in 
>    the above thread)
> 
> Yours, Florian
> - -- 
> Preserve wildlife - pickle a squirrel today!
> -----BEGIN PGP SIGNATURE-----
> Version: GnuPG v1.2.6 (GNU/Linux)
> 
> iD8DBQFCGxp+7CzyshGvatgRAsMOAKDlUbCE1vJw3zB2W/w4bYa2/6dg+ACcDdvW
> HO16/AOvfxJu+Bw5x/flhPg=
> =5mjw
> -----END PGP SIGNATURE-----
> 
> 
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