Re: [Bluez-devel] hci_acl_tx_to: hci0 ACL tx timeout

[Marcel Holtmann <marcel@holtmann.org>]

Hi James,

> > I really think this is buggy hardware in the USB dongle or in the USB
> > host controller. Maybe it is also only a software problem and related to
> > the USB subsystem. I don't know.
> 
> Well, tell me what to try to determine where the cause is.  Surely it
> should be possible to instrument the kernel functions to gather more
> information about the problem?  Then we can say "yes, it's the
> hardware", or something else.

you can try to change the number of max bulk urb's to have 2 on rx and 2
on tx. May this helps (drivers/bluetooth/hci_usb.c).

Or disable CONFIG_BT_HCIUSB_SCO so no USB bandwith is consumed for ISOC
transfers.

> > If it is CSR based you can try "hciconfig hci0 revision".
> 
> hci0:   Type: USB
>         BD Address: 00:02:72:01:E5:FF ACL MTU: 192:8  SCO MTU: 64:8
>         HCI 16.4
>         Chip version: BlueCore02
>         Max key size: 56 bit
>         SCO mapping:  HCI
> 
> Does that help?  (any good?)

This chip should actually work fine.

Regards

Marcel




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