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From:   bugzilla-daemon@bugzilla.kernel.org
To:     linux-bluetooth@vger.kernel.org
Subject: [Bug 60824] [PATCH][regression] Cambridge Silicon Radio, Ltd
 Bluetooth Dongle unusable
Date:   Sun, 27 Sep 2020 12:45:53 +0000
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Message-ID: <bug-60824-62941-UpP9PYpiCy@https.bugzilla.kernel.org/>
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https://bugzilla.kernel.org/show_bug.cgi?id=60824

--- Comment #155 from vinodmishra@gmail.com ---
(In reply to Flole from comment #154)
> (In reply to Alex from comment #86)
> > Hi Swyter,
> > 
> > I also tried your patch v2 and actually in my case see no difference with
> > the previous ones I tried (see my comments 55/56
> > https://bugzilla.kernel.org/show_bug.cgi?id=60824#c55 )
> > 
> > Linux recognizes the controller, but it's unusable:
> > 
> > Can't init device hci0: Invalid argument (22)
> > 
> > > HCI Event: Command Complete (0x0e) plen 4                                 
> > >                                                                  #22
> [hci0]
> > > 11.191461
> >       Set Event Filter (0x03|0x0005) ncmd 1
> >         Status: Invalid HCI Command Parameters (0x12)
> > = Close Index: 00:1A:7D:DA:71:12                                            
> > [hci0] 11.191493
> > 
> > 
> > I've seen several people here have this issue, and I believe that comment
> 59
> > may be quite relevant here:
> > 
> > > Set Event fails, looking at hci_core.c the set filter and previous calls
> > are
> > > made only if device supports BREDR, is there any way to tell device
> doesn't
> > > support, or patch this ?
> 
> I have the same device, and my fix was simply changing the #define that
> checks if a device supports BREDR to "false" (aka disabling BREDR support
> completely) and that solved it.
Thanks so much. 
Same device and same issue on Pi Zero. Changing the "#define
lmp_bredr_capable(dev)" in hci_core.h to return false did the trick.

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