Module settings ignored? Cannot connect Bose 700 in Dual Channel SBC HD/XQ mode.

[aljazzair]

Module settings ignored? Cannot connect Bose 700 in Dual Channel SBC HD/XQ mode.

[aljazzair]

I would like to add that I just tested my hardware in a virtual machine with a distribution called Zenwalk, which incorporates SBC XQ patches to pulseaudio. Using the exact same bluetooth dongle, the Bose 700 headphones do connect in Dual Channel with 16/8 bands/lenghth and a Bitpool of 38. Quality is noticeably superior to regular SBC.
Therefore the headphones and dongle do support the higher SBC quality settings.
I can only conclude that there is an issue with way the software interacts with the hardware, but I am unable to resolve the problem.
Any pointers would be much appreciated.
Thanks again for creating this module, and looking forward to any suggestion :)

[aljazzair]

Hello
It seems no one can help so I am closing this issue.
I decided to use Pali's improvements instead, and they work well without issue for my setup:
https://gitlab.freedesktop.org/kapiwko/pulseaudio/-/issues/1
Thanks again for creating this module.

[mogenson]

Just adding that I have the same headphones and using the settings listed above I see the same issue.

From btmon:

< ACL Data TX: Handle 256 flags 0x00 dlen 18             #1271 [hci0] 14.903443
      Channel: 1093 len 14 [PSM 25 mode Basic (0x00)] {chan 0}
      AVDTP: Set Configuration (0x03) Command (0x00) type 0x00 label 9 nosp 0
        ACP SEID: 1
        INT SEID: 5
        Service Category: Media Transport (0x01)
        Service Category: Media Codec (0x07)
          Media Type: Audio (0x00)
          Media Codec: SBC (0x00)
            Frequency: 44100 (0x20)
            Channel Mode: Joint Stereo (0x01)
            Block Length: 16 (0x10)
            Subbands: 8 (0x04)
            Allocation Method: Loudness (0x01)
            Minimum Bitpool: 2
            Maximum Bitpool: 53

[aljazzair]

Just adding that I have the same headphones and using the settings listed above I see the same issue.

From btmon:

< ACL Data TX: Handle 256 flags 0x00 dlen 18             #1271 [hci0] 14.903443
      Channel: 1093 len 14 [PSM 25 mode Basic (0x00)] {chan 0}
      AVDTP: Set Configuration (0x03) Command (0x00) type 0x00 label 9 nosp 0
        ACP SEID: 1
        INT SEID: 5
        Service Category: Media Transport (0x01)
        Service Category: Media Codec (0x07)
          Media Type: Audio (0x00)
          Media Codec: SBC (0x00)
            Frequency: 44100 (0x20)
            Channel Mode: Joint Stereo (0x01)
            Block Length: 16 (0x10)
            Subbands: 8 (0x04)
            Allocation Method: Loudness (0x01)
            Minimum Bitpool: 2
            Maximum Bitpool: 53

Pali's solution linked above works. It involves replacing pulsaudio altogether.
You can also scrap Pulseaudio and go with bluez-alsa:
https://github.com/Arkq/bluez-alsa
Both alternative solutions allow Bose 700 to work in Dual Channel SBC XQ.