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I just tried Debian and found that my bluetooth are not able to work. I have bluez and blueman installed, while bluetoothctl shows No default controller available respond.

bluetoothctl
[bluetooth]# agent on
Agent registered
[bluetooth]# default-agent
Default agent request successful
[bluetooth]# power on
No default controller available 

Bellow are my hardware condition details:

sudo lsusb; uname -a; lsmod | grep bluetooth; dmesg | grep -i firmware
Bus 002 Device 002: ID 8087:0024 Intel Corp. Integrated Rate Matching Hub
Bus 002 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 001 Device 005: ID 064e:812c Suyin Corp. 
Bus 001 Device 004: ID 0cf3:0036 Atheros Communications, Inc. 
Bus 001 Device 003: ID 0bda:0129 Realtek Semiconductor Corp. RTS5129 Card Reader Controller
Bus 001 Device 002: ID 8087:0024 Intel Corp. Integrated Rate Matching Hub
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 004 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
Bus 003 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Linux localhost 3.16.0-4-amd64 #1 SMP Debian 3.16.7-ckt25-2+deb8u3 (2016-07-02) x86_64 GNU/Linux
bluetooth             374429  10 bnep,ath3k,btusb,rfcomm
6lowpan_iphc           16588  1 bluetooth
rfkill                 18867  6 cfg80211,bluetooth,dell_laptop
crc16                  12343  2 ext4,bluetooth
[    0.131092] [Firmware Bug]: ACPI: BIOS _OSI(Linux) query ignored
[    9.828699] usb 1-1.4: firmware: failed to load ar3k/AthrBT_0x31010000.dfu (-2)
[    9.828772] usb 1-1.4: Direct firmware load failed with error -2
[   19.146915] r8169 0000:09:00.0: firmware: failed to load rtl_nic/rtl8105e-1.fw (-2)
[   19.147006] r8169 0000:09:00.0: Direct firmware load failed with error -2
[   19.148582] r8169 0000:09:00.0 eth0: unable to load firmware patch rtl_nic/rtl8105e-1.fw (-12)

Your help will be very appreciated. Thanks

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2 Answers 2

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I had the same issue on an Acer laptop. what I did was to grep through the dmesg output.

the line which looked most informative was:

usb 3-1.1: firmware: failed to load ar3k/AthrBT_0x11020000.dfu (-2)

looking for in on the internet I found this q&a which solved my problem.

in short:

sudo apt-get install firmware-atheros
bluetooth-sendto ## (and escape to close the window)

the first installed the package I was missing, the second triggered the system to find the bluetooth device. when I again started bluetoothctl, it informed me that a controller was available, and the rest went as described in most documentation pages.

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I had the same issue. After a long research found out that the driver was not installed. Check that answer Bluetooth doesn't work in debian 10 and see if your drivers are installed correctly =)

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