btsco, udev and other issues

Bluez-devel Mark Hellman 2 participants 3 messages Sep 21, 2006 – Nov 8, 2006 Bluetooth drivers

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Mark Hellman

author

2006-09-21 13:51 UTC #0 lore raw

I have the following issues with btsco and Nokia HS-56W headset:

1. I have seen several reports that indicate btsco can be run as a regular user. But I have only been able to run it as root. When I run it as a regular user I get:
btsco v0.42
Error: control open (hw:1): No such device
Error: Can't find device. Bail

2. As a consequence of running btsco as root, the newly created sound device cannot be seen by regular users. What udev rule should I set so that the BT headset is seen by other users when btsco is run by root?

3. While using btsco with Skype, a lot of message like the following appear on syslog:
kernel: snd-bt-sco: Shift problem detected! Fixing to 1.
kernel: snd-bt-sco: Shift problem detected! Fixing to 0.
What do they mean? Should I be worried about them?

4. When I hang up a call on Skype, I'm not able to place another call again. Skype says "Problem with sound device". I need then to restart Skype in order to be able access the BT headset again. But when the other calling party hangs up, this problem does not occur... It seems that when I hang up a call, the SCO channel is not cleanly disconnected. Any ideas why?

I would be grateful if someone could enlighten me on at least some of these issues.

Mark

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Mark Hellman

author

2006-09-28 10:06 UTC #1 lore raw

Can'T anyone give me some hints on these questions?

Quoted 33 lines · Mark Hellman

I have the following issues with btsco and Nokia HS-56W headset:
1. I have seen several reports that indicate btsco can be run as a regular user. But I have only been able to run it as root. When I run it as a regular user I get:
btsco v0.42
Error: control open (hw:1): No such device
Error: Can't find device. Bail
2. As a consequence of running btsco as root, the newly created sound device
cannot be seen by regular users. What udev rule should I set so that the BT headset is seen by other users when btsco is run by root?
3. While using btsco with Skype, a lot of message like the following appear
on syslog:
kernel: snd-bt-sco: Shift problem detected! Fixing to 1.
kernel: snd-bt-sco: Shift problem detected! Fixing to 0.
What do they mean? Should I be worried about them?
4. When I hang up a call on Skype, I'm not able to place another call again.
Skype says "Problem with sound device". I need then to restart Skype in order to be able access the BT headset again. But when the other calling party hangs up, this problem does not occur... It seems that when I hang up a call, the SCO channel is not cleanly disconnected. Any ideas why?

Quoted 4 lines

I would be grateful if someone could enlighten me on at least some of these issues.
Mark

Brad Midgley

2006-11-08 23:52 UTC #2 lore raw

In reply to Mark Hellman

Mark

Quoted 10 lines

1. I have seen several reports that indicate btsco can be run as a regular user. But I have only been able to run it as root. When I run it as a regular user I get:
btsco v0.42
Error: control open (hw:1): No such device
Error: Can't find device. Bail
2. As a consequence of running btsco as root, the newly created sound device cannot be seen by regular users. What udev rule should I set so that the BT headset is seen by other users when btsco is run by root?

Maybe regular users can't initiate the kernel module load. In any case I am accepting patches for the btsco kernel mod stuff but I will be focusing on the pure userspace plugins myself.

Quoted 5 lines

3. While using btsco with Skype, a lot of message like the following appear on syslog:
kernel: snd-bt-sco: Shift problem detected! Fixing to 1.
kernel: snd-bt-sco: Shift problem detected! Fixing to 0.
What do they mean? Should I be worried about them?

This is related to the sco flow control problem. If you are not getting static, you can ignore these messages. If you are getting static, see the kernel patches on the wiki page at
https://help.ubuntu.com/community/BluetoothAudio

brad

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