https://bbs.deepin.org/user/48640 乌格格

[    4.304564] bluetooth hci0: firmware: failed to load brcm/BCM20702A1-0489-e07a.hcd (-2)
[    4.304570] bluetooth hci0: Direct firmware load for brcm/BCM20702A1-0489-e07a.hcd failed with error -2
[    4.304574] Bluetooth: hci0: BCM: Patch brcm/BCM20702A1-0489-e07a.hcd not found
在你的dmesg 里找到以上这几行，
感觉你可以参考Ubuntu论坛里的这个回答先试试
                                                         ——来自同样被博通蓝牙整的很惨的我

You need to install firmware.

Distribution of Broadcom firmware is not allowed by Broadcom license. So you need to get it yourself. It is a bit complex, but there is no other legal way.

    Download Broadcom Windows 8 driver or FROM HERE. I found the latest drivers at Broadcom site. The homepage for the drivers is HERE in case they change the link.

    Open this file by Archive Manager and find there bcbtums-win8x86-brcm.inf file. Name of the file may differ in some drivers. It can be bcbtums.inf located at Win32 or Win64 directory. It does not matter 32 or 64 bit to download.

    Search this file for VID_0A5C&ID_21D7. These numbers are from your lsusb output

    0a5c:21d7 Broadcom Corp. BCM43142 Bluetooth 4.0.

Comment: Some devices are not recognized as Broadcom BT in lsusb. If you are unsure which one is your BT device, run usb-devices command, it will give more detailed information. There you can find product and vendor IDs.

You will see some line ending with RAMUSB21D7

Search this file for RAMUSB21D7. You will find a section there like that:

    [RAMUSB21D7.CopyList]
    bcbtums.sys
    btwampfl.sys
    BCM43142A0_001.001.011.0122.0126.hex

That's what we are looking for. Name of the firmware file. BCM43142A0_001.001.011.0122.0126.hex

    Now extract that firmware from the same cab file.

    Then you need to convert this file from hex to hcd format.

    Download the tool for that

    git clone git://github.com/jessesung/hex2hcd.git
    cd hex2hcd
    make

    You will get hex2hcd folder in your home directory.

    Place the firmware file to your home folder and run

    ~/hex2hcd/hex2hcd ~/BCM43142A0_001.001.011.0122.0126.hex ~/BCM43142A0-0a5c-21d7.hcd

    You see that 0a5c-21d7 is id of your adapter from lsusb.

Important: For kernels 4.2+ you call this file as BCM.hcd instead.

   ~/hex2hcd/hex2hcd ~/BCM43142A0_001.001.011.0122.0126.hex ~/BCM.hcd

For kernels 4.8+ name of the file should be BCM--<ID>.hcd, like BCM-0a5c-21d7.

    Now just copy BCM43142A0-0a5c-21d7.hcd, or another file according to the kernel version to /lib/firmware/brcm directory by

    sudo cp ~/BCM43142A0-0a5c-21d7.hcd /lib/firmware/brcm

For kernels 4.2+

    sudo cp ~/BCM.hcd /lib/firmware/brcm

For kernels 4.8+

    sudo cp ~/BCM-0a5c-21d7.hcd  /lib/firmware/brcm

You can always check if the file name is correct by running dmesg | grep -i blue. There will be an error message if the file is not found.

    Turn your computer off and on again. Not just reboot!

    Your adapter will get firmware and bluetooth should work.

All this looks complicated, but it is Broadcom lawyers to blame for that. Most of other vendors allow to re-distribute firmware under condition that it is done acompanied with the license.

That allows linux maintainers to include firmware in distributions.

But not in case of Broadcom. That's why it is not done an easy way.

Many people could convert all hex files to hcd and make them available. Or just add them to linux-firmware package of Ubuntu.

But it is not legal :-((

已经反馈了

贴一下 'sudo rfkill list' 和 'sudo hciconfig' 的输出, 或者回到win把蓝牙关闭再打开一下

...
broadcom bluetooth的firmware还没打包吗？ 记得很早之前给张爽还是刘剑锋说过的, 还有nouveau的firmware

估计...没打包全？

nouveau-fw　仓库已经有了。

邪教用户有AUR提供固件，由于固件太旧，于是我选择了自己打包，目前正常

直接上4.12.8吧，这个内核似乎对硬件支持很好

不知道对外接显示器如何，我现外接显示器就很卡，估计显卡问题。我只有集显。