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

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

--- Comment #162 from Yuri Santos (yrds96@protonmail.com) ---

(In reply to vinodmishra from comment #155)

(In reply to Flole from comment #154)

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(In reply to Alex from comment #86)

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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)

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HCI Event: Command Complete (0x0e) plen 4                               
                                                                 #22

[hci0]

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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

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may be quite relevant here:

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Set Event fails, looking at hci_core.c the set filter and previous

calls

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are

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made only if device supports BREDR, is there any way to tell device

doesn't

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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.

Could you provide more detailed information about how to do this? I'm trying to
do the same thing but not sure which drivers i have to compile to apply this
change.

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