Re: [PATCH] bluetooth/l2cap: silence framedrop kmsg noise

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On Sun, Feb 22, 2015 at 12:53 PM, Marcel Holtmann <marcel@xxxxxxxxxxxx> wrote:
> can you send a btmon trace for this

sure, check your email.

> and be more specific which devices are these.

It's not pretty.  It's a (usb id) 046d:c709.  They come bundled with
Logitech keyboards.  They require hid2hci (udev, or somebody, does it
for me automagically these days).

I believe the radio is a BCM2045A... or maybe not... it's definitely a
fairly obscure thing to use as a radio, as Logitech pretty much goes
out of their way to pretend it's married to the keyboard it comes
with.

Is there some good way to ask the kernel what board it thinks it's
talking to?  I have heard some grumbling about Logitech recycling the
0xc709 product ID although I'm not sure I trust whoever said it :(

The device has a plastic OEM "shell" but the plastic is
semitransparent.  If I shine my flashlight at it just right, I can see
an inner plastic(?) enclosure with different markings than Logitech's,
but it's partially obscured -- all I can read on that inner device is
the last line: "0541 LF".  I could definitely sacrifice it for
science, if it became necessary.

I only ever use a2dp, avrcp and hfp (or maybe hsp?, can't keep 'em
straight in my head); I have a couple different gizmos and they all
fill my logs with that message.

> There seems to be something really off going on here.

Really?  That's sort-of encouraging... There were so many reports
online and everyone sounded so resigned to this fate that I just
assumed that was the expected result.

One odd behavior I have observed (aside from logs full of garbage) --
if I go too far out of range, the entire connection between my device
and the dongle just "breaks".  If I come back into range, they are
never able to find each other and resume their conversation until
reboot my gizmo (or sometimes it will come back online after a very
long time).  Yet, the dongle still thinks they're connected.  I've
learned to just leave them behind before leaving the room :)

Greg Turner
gmt@xxxxxxxxxxx
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