Re: step by step - how to get your bluetooth stereo headset fully working with the bluez software stack under linux

Chris Carlin wrote:
> Firstly, on a whim I picked up a new USB bluetooth dongle.
> 
> This one is an iogear class 2 bluetooth version 2.0 (EDR) model, while 
> the previous one was class 1 version 1.2 and made by Linksys. Audio is 
> much improved in that I can move my bluetooth mouse all I want without a 
> single skip, but as soon as I touch the keyboard it still skips terribly.
> 
> I can see now that the headphones (again, the S805s) are bluetooth 2.0 
> with EDR, which I assume is what makes them work better, but both 
> keyboard and mouse are version 1.2. I wonder if everything would work if 
> it was all 2.0.
> 
> Is there any way to adjust sbcbitpool for lower bandwidth? Such an 
> option existed for the experimental alsa bluetooth stuff.
> 
> 
> Jelle de Jong wrote:
>> I bought an other new bt-2400p bluetooth adapter for testing, with 
>> this adapter i cant get my devices manually in master mode:
>>
>> sudo hcitool con
>> Connections:
>>     < ACL 00:0D:FD:18:6E:3C handle 12 state 1 lm SLAVE ENCRYPT
>>
>> sudo hcitool sr 00:0D:FD:18:6E:3C master
>> Switch role request failed: Input/output error
> 
> I learned the hard way that roles can only be switched with encryption off.
> Try:
> sudo hcitool enc 00:0D:FD:18:6E:3C off
> sudo hcitool sr 00:0D:FD:18:6E:3C master
> 
> But more importantly, I used to have to manually set things to master 
> until I cleaned up my hcid.conf file, adding the correct lp and lm 
> lines. I believe you have already corrected yours but you might want to 
> double check them again since this gave me automatic master. Here are 
> all of the uncommented lines from my file:
> 
> options {
>         autoinit yes;
>         security user;
>         pairing multi;
> }
> 
> device {
>         name "BlueZ (%d)";
>         class 0x000100;
>         iscan enable; pscan enable;
>         lm accept,master;
>         lp hold,sniff,park;
> }

Thanks, I seems you also need to remove the lp rswitch options to make 
devices connect as master. To bad my encryption is gone now.

With my trust ultra small bluetooth 2 usb adapter bt-2400p i got the 
following messages:
kernel: l2cap_recv_acldata: Unexpected continuation frame (len 0)
last message repeated 151 times

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