linux-kernel - Re: 3.10-rc: bluetooth disappeared on thinkpad x60 (regression)

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Message-ID: <20130610110423.GA8834@amd.pavel.ucw.cz>
Date:	Mon, 10 Jun 2013 13:04:23 +0200
From:	Pavel Machek <pavel@....cz>
To:	"Rafael J. Wysocki" <rjw@...k.pl>,
	kernel list <linux-kernel@...r.kernel.org>,
	marcel@...tmann.org, gustavo@...ovan.org,
	linux-bluetooth@...r.kernel.org
Subject: Re: 3.10-rc: bluetooth disappeared on thinkpad x60 (regression)

Hi!

> > root@amd:~# hciconfig hci0 up
> > Can't init device hci0: Operation not supported (95)
> > root@amd:~# hcitool inq
> > Inquiring ...
> > Inquiry failed.: No such device
> > root@amd:~# 
> 
> Could you take logs of the HCI traffic that happens when you try this.
> You can use the btmon tool from BlueZ for it. Based on a quick look at
> the code it seems like this particular error could only come if one of
> the HCI commands used for device initialization fails.

Where can I get btmon? I tried 

root@amd:~# apt-get install bluez-utils

but it is not there. (Can I just add printk somewhere?)

> The Bluetooth HCI init sequence is constructed using only commands that
> should be expected to work assuming the hardware follows the
> specification, but occasionally we do encounter Bluetooth hardware that
> is broken in one way or another and needs a work around to the sequence.
> E.g. recently we added a couple of extra commands to read some new
> parameters from the hardware, commands that are mandatory for hardware
> beyond a specific version (something we check for), but could be that
> the chip on the X60 doesn't support these.

I don't expect strace is enough?

set_thread_area({entry_number:-1 -> 6, base_addr:0xb7624b20,
limit:1048575, seg_32bit:1, contents:0, read_exec_only:0,
limit_in_pages:1, seg_not_present:0, useable:1}) = 0
mprotect(0xb7766000, 8192, PROT_READ)   = 0
mprotect(0xb77b2000, 4096, PROT_READ)   = 0
munmap(0xb7782000, 76642)               = 0
socket(PF_BLUETOOTH, SOCK_RAW, 1)       = 3
ioctl(3, 0x800448d3, 0xb77cc420)        = 0
ioctl(3, 0x400448c9, 0)                 = -1 EOPNOTSUPP (Operation not
supported)
write(2, "Can't init device hci0: Operatio"..., 53Can't init device
hci0: Operation not supported (95)
) = 53
exit_group(1)                           = ?
root@amd:~# btmon

Thanks,
								Pavel
-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
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