Re: [Bluez-devel] "comlicated" setup - known issues for hid and SCO?

[Marcel Holtmann <marcel@holtmann.org>]

Hi Lars,

> right now I'm using two BT devices with my Epox dongle, an MX900 mice
> and a Sony Ericcson HBH-35 Headset with snd-bt-sco (voice mode 0x0060,
> before you ask ;)

what does "hcitool info ..." say about your headset? What is the
firmware version of your EPoX dongle?

> both devices work fluently when used without the other, but when I use
> headset and mouse at the same time there are various problems during
> connect, scan and usage.
> 
> The main usage problem was that the sco layer got scrambled audio
> (sounded much like random data) on about every third sco connection.
> After a while, mouse and headset began to block each other, and the
> stack seemed to get more and more, well, muddy. After some more
> connection retries even the mouse, before only "hanging" when the
> headset tried to connect, stopped working fully.
> 
> dmesg only noticed this:
> 
> hci_scodata_packet: hci0 SCO packet for unknown connection handle 76
> 
> When even connection was impossible, I plugged the BT dongle out and put
> it back in. After reloading the hid module and programs the mouse and
> headset worked again.

I think that is a hardware problem. A protocol analyser would help to
track this down ;)

Regards

Marcel




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