[pulseaudio-discuss] bluetooth: problem with old headset

[Tanu Kaskinen]

On Fri, 2015-03-13 at 08:36 +0100, Georg Chini wrote:
> On 04.03.2015 08:42, Georg Chini wrote:
> > On 02.03.2015 23:02, Georg Chini wrote:
> >> On 02.03.2015 07:41, Georg Chini wrote:
> >>> On 23.02.2015 09:06, David Henningsson wrote:
> >>>>
> >>>>
> >>>> On 2015-02-21 23:14, Georg Chini wrote:
> >>>>> Hello,
> >>>>>
> >>>>>
> >>>>>
> >>>>> With the Plantronics 590, the connect() call in bluez5_sco_acquire_cb
> >>>>> returns
> >>>>> "Protocol not supported". The headset itself is functional, I tested
> >>>>> with my mobile.
> >>>>>
> >>>> I've heard of this, but never seen it myself. I suspect it's a 
> >>>> kernel regression, but I'm not sure. Does it work with older 
> >>>> kernels? Like, one, two, three years old kernels or such?
> >>>>
> >>>
> >> Yes, it is a kernel regression introduced in 3.12. There are two 
> >> reasons why it does no longer
> >> work:
> >> 1) The driver expects the headset to issue a sync connection finished 
> >> event (0x2c), even
> >> if the connection attempt fails, so that it can test various packet 
> >> types until it succeeds.
> >> My old headset does not do so, it just sends a command status event 
> >> (0x0f) with the
> >> status code 0x1a. So the driver tries its first option and then fails.
> >> 2) The headset apparently needs a retrans_effort of 0xff (whatever 
> >> that parameter means)
> >> instead of 0x01.
> I just noticed that this has already been fixed in 3.18, sorry for the 
> noise.

No need to be sorry, this was very useful noise. It helped me to close
this bug: https://bugs.freedesktop.org/show_bug.cgi?id=87284

-- 
Tanu