[Bug 60824] [PATCH][regression] Cambridge Silicon Radio, Ltd Bluetooth Dongle unusable

https://bugzilla.kernel.org/show_bug.cgi?id=60824

er.krali@gmail.com changed:

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--- Comment #165 from er.krali@gmail.com ---

(In reply to Yuri Santos from comment #164)

(In reply to vinodmishra from comment #155)

quoted

(In reply to Flole from comment #154)

[snip]

quoted

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.

Thanks, i did that. Seems to have a advance, but still not working as
expected.


Info and logs:

https://gist.github.com/Yrds/5c2d610c86facc9b1f0522a6509e9e23

I can report some success here using the solution proposed here:

https://askubuntu.com/a/1304723

IOW, disabling the "clear event filter" step altogether in hci_core.c (lines
around 296-297).

Perhaps this could be added as another quirk, but that's sadly beyond my
ability.

For reference, here's the data of my model (Bluetooth 5.0, bcdDevice 8891) :

    Features: 0xbf 0x3e 0x4d 0xfa 0xdb 0x3d 0x7b 0xc7
    HCI Version: 5.0 (0x9) HCI Revision: 0x810
    LMP Version: 5.0 (0x9) LMP Subversion: 0x2312
    Manufacturer: Cambridge Silicon Radio (10)

  idVendor           0x0a12 Cambridge Silicon Radio, Ltd
  idProduct          0x0001 Bluetooth Dongle (HCI mode)
  bcdDevice           88.91
  iManufacturer           0 
  iProduct                2 BT DONGLE10

I have tried pairing a couple of devices and it has worked so far.

Hopefully a cleaner version of this hack will be able to get into the official
kernel.

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