linux-kernel - Re: [now bisected] Weird bluetooth keyboard regression

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Message-ID: <20120501110156.2b6e0561@lwn.net>
Date:	Tue, 1 May 2012 11:01:56 -0600
From:	Jonathan Corbet <corbet@....net>
To:	LKML <linux-kernel@...r.kernel.org>
Cc:	linux-bluetooth@...r.kernel.org, Matthew Garrett <mjg@...hat.com>
Subject: Re: [now bisected] Weird bluetooth keyboard regression - just me?

On Tue, 1 May 2012 07:37:11 -0600
Jonathan Corbet <corbet@....net> wrote:

> I have a logitech Dinovo Edge bluetooth keyboard that I've used for
> years.  With 3.4 kernels, the keyboard generates no input until I've
> banged on it for a couple of seconds.  If I continually hit characters,
> they make it through; as soon as I stop for even a brief period (even
> somebody as verbose as me has to come up for air occasionally), it goes
> back to sleep.

OK, git bisect has rendered its verdict:

d35e70d50a0641ebc1502fd343bef9b4011ada27 is the first bad commit
commit d35e70d50a0641ebc1502fd343bef9b4011ada27
Author: Matthew Garrett <mjg@...hat.com>
Date:   Fri Feb 3 17:11:55 2012 -0500

    usb: Use hub port data to determine whether a port is removable

    Hubs have a flag to indicate whether a given port carries removable devices
    or not. This is not strictly accurate in that some built-in devices
    will be flagged as removable, but followup patches will make use of platform
    data to make this more reliable.

    Signed-off-by: Matthew Garrett <mjg@...hat.com>
    Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

...and, indeed, things do seem to break right there.

I assume there's something funky about the (oldish) USB bluetooth dongle
that came with my keyboard that interacts badly with this patch.  Matthew,
is there anything I can do or tell you to help figure this one out?

Thanks,

jon
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