From: Jeremy Jackson <jerj@coplanar.net>
To: linux-bluetooth@vger.kernel.org
Subject: btusb regression on commands unsupported by adapter
Date: Fri, 18 Dec 2009 12:44:32 -0500 [thread overview]
Message-ID: <1261158272.4932.184.camel@ragnarok> (raw)
I've posted more details here for userspace diagnosis/workaround,
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/377225
Some (older?) BT adapters don't support the commands 'Read Default Link
Policy Settings'
'Write Default Link Policy Settings'
as shown by # hciconfig hci0 commands
This appears be one cause of the infamous kernel message: hci0: command
tx timeout. This in turn causes bluetoothd to give up and take down the
interface.
If you kill bluetoothd, and manually # hciconfig hci0 up, you can
discover and inq devices no problem.
I made a patch to disable the offending command, and the above mentioned
bug report I gave instructions to gather data on adapter BT version,
supported features, and supported commands. Hopefully some user reports
can be used to make use of the command conditional on actual adapter
support.
The question for kernel side is, regression, or corrected behaviour?
--
Jeremy Jackson
Coplanar Networks
(519)489-4903
http://www.coplanar.net
jerj@coplanar.net
next reply other threads:[~2009-12-18 17:44 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-12-18 17:44 Jeremy Jackson [this message]
2009-12-18 21:53 ` btusb regression on commands unsupported by adapter Marcel Holtmann
2009-12-23 13:51 ` Stefan Seyfried
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