Re: [Bluez-devel] kernel: hci_scodata_packet: hci1 SCO packet for unknown connection handle 0

[Marcel Holtmann <marcel@holtmann.org>]

Hi Stefan,

> > actually with isco=1 the SCO transfers are still on, but limited to
> > 8-bit instead of 16-bit with isoc=2. So if you have isoc=2 it fills up
> > your syslog. Can you extract some of these SCO packets with hcidump for
> > me.
> 
> ok, it looks like this (hoping that i invoked hcidump correctly, i am still
> learning this bluetooth thingy :-):

the preferred way would be "hcidump -i hci1 -X -V" to have full decoding
support, but for SCO this doesn't really matter.

> root@strolchi:~# hcidump -i hci1
> HCI sniffer - Bluetooth packet analyzer ver 1.29
> device: hci1 snap_len: 1028 filter: 0xffffffff
> > SCO data: handle 0 dlen 0
> > SCO data: handle 0 dlen 0
> > SCO data: handle 0 dlen 0
> > SCO data: handle 0 dlen 0
> > SCO data: handle 0 dlen 0
> > SCO data: handle 0 dlen 0
> > SCO data: handle 0 dlen 0
> > SCO data: handle 0 dlen 0
> > SCO data: handle 0 dlen 0
> > SCO data: handle 0 dlen 0
> 
> This happens immediately after plugging the thing in, there is no pairing
> or any application involved that might trigger this AFAICT.

Another RTX based dongle with RTX chip (0400:0807) has already been
blacklisted by me. I have no idea, why they can't get this right.
 
> > Any chance of a name or identification of this dongle?
> 
> It is an Abe UB20S, http://www.abe-hk.com/english/products/ub12-22/ub12-22.htm
> The FCC ID is NV6-CS8024.
> It is sold e.g. by conrad.com in germany and pretty cheap (around 10 Euro),
> and it is pretty small (this is why i bought it, i can leave it plugged in
> when putting the notebook into the bag :-)

It would be interesting if this will work with isoc=1 and a 16-bit PCM
stream. You should really try some stuff from the btsco package.

Regards

Marcel




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