I have an Amazon Echo and a laptop running Ubuntu 16.04.1. I can successfully pair the device via Bluetooth (the Echo says `Now connected to <my machine's name>`), but when I test the sound, nothing is heard. The volumes are high enough and other devices can connect to the Echo just fine.

[![No sound through the Echo](https://i.stack.imgur.com/l8XHF.png)](https://i.stack.imgur.com/l8XHF.png)

Here's the `dmesg` output:

```
$ dmesg | grep -i blue
[   12.419477] Bluetooth: Core ver 2.21
[   12.419491] Bluetooth: HCI device and connection manager initialized
[   12.419494] Bluetooth: HCI socket layer initialized
[   12.419497] Bluetooth: L2CAP socket layer initialized
[   12.419502] Bluetooth: SCO socket layer initialized
[   12.473236] Bluetooth: hci0: read Intel version: 370810011003110e00
[   12.480889] Bluetooth: hci0: Intel Bluetooth firmware file: intel/ibt-hw-37.8.10-fw-1.10.3.11.e.bseq
[   12.839251] Bluetooth: hci0: Intel Bluetooth firmware patch completed and activated
[   13.386452] Bluetooth: BNEP (Ethernet Emulation) ver 1.3
[   13.386456] Bluetooth: BNEP filters: protocol multicast
[   13.386460] Bluetooth: BNEP socket layer initialized
[   16.473284] Bluetooth: RFCOMM TTY layer initialized
[   16.473292] Bluetooth: RFCOMM socket layer initialized
[   16.473297] Bluetooth: RFCOMM ver 1.11
[10944.651128] Bluetooth: hci0: read Intel version: 370810011003110e00
[10944.651133] Bluetooth: hci0: Intel Bluetooth firmware file: intel/ibt-hw-37.8.10-fw-1.10.3.11.e.bseq
[10944.977821] Bluetooth: hci0: Intel Bluetooth firmware patch completed and activated
[24061.878085] Bluetooth: hci0: read Intel version: 370810011003110e00
[24061.887184] Bluetooth: hci0: Intel Bluetooth firmware file: intel/ibt-hw-37.8.10-fw-1.10.3.11.e.bseq
[24062.211121] Bluetooth: hci0: Intel Bluetooth firmware patch completed and activated
[24072.874829] Bluetooth: hci0: read Intel version: 370810011003110e00
[24072.874835] Bluetooth: hci0: Intel Bluetooth firmware file: intel/ibt-hw-37.8.10-fw-1.10.3.11.e.bseq
[24073.196858] Bluetooth: hci0: Intel Bluetooth firmware patch completed and activated
[45209.076985]  iwlwifi videobuf2_vmalloc videobuf2_memops videobuf2_v4l2 serio_raw videobuf2_core btrtl btbcm btintel input_leds bluetooth snd_hda_codec_realtek(OE) snd_hda_codec_generic(OE) snd_hda_codec_hdmi(OE) v4l2_common snd_seq_midi joydev cfg80211 snd_seq_midi_event videodev media snd_hda_intel(OE) snd_hda_codec(OE) snd_hda_core(OE) snd_hwdep lpc_ich snd_pcm snd_rawmidi shpchp snd_seq mei_me mei snd_seq_device snd_timer snd elan_i2c int3403_thermal 8250_fintek soundcore 8250_dw i2c_designware_platform dw_dmac snd_soc_sst_acpi i2c_designware_core dell_smo8800 dw_dmac_core processor_thermal_device spi_pxa2xx_platform int3402_thermal int3400_thermal int340x_thermal_zone acpi_thermal_rel intel_soc_dts_iosf dell_rbtn acpi_als mac_hid acpi_pad kfifo_buf industrialio parport_pc ppdev lp parport autofs4
[55174.636122] Bluetooth: hci0: read Intel version: 370810011003110e00
[55174.646073] Bluetooth: hci0: Intel Bluetooth firmware file: intel/ibt-hw-37.8.10-fw-1.10.3.11.e.bseq
[55174.970198] Bluetooth: hci0: Intel Bluetooth firmware patch completed and activated
[55181.295879] Bluetooth: hci0: read Intel version: 370810011003110e00
[55181.295922] Bluetooth: hci0: Intel Bluetooth firmware file: intel/ibt-hw-37.8.10-fw-1.10.3.11.e.bseq
[55181.670006] Bluetooth: hci0: Intel Bluetooth firmware patch completed and activated
[56551.946597] Bluetooth: hci0: read Intel version: 370810011003110e00
[56551.955475] Bluetooth: hci0: Intel Bluetooth firmware file: intel/ibt-hw-37.8.10-fw-1.10.3.11.e.bseq
[56552.282610] Bluetooth: hci0: Intel Bluetooth firmware patch completed and activated
[98502.038807] Bluetooth: hci0: read Intel version: 370810011003110e00
[98502.038816] Bluetooth: hci0: Intel Bluetooth firmware file: intel/ibt-hw-37.8.10-fw-1.10.3.11.e.bseq
[98502.356833] Bluetooth: hci0: Intel Bluetooth firmware patch completed and activated
[107908.657215] Bluetooth: hci0: read Intel version: 370810011003110e00
[107908.657298] Bluetooth: hci0: Intel Bluetooth firmware file: intel/ibt-hw-37.8.10-fw-1.10.3.11.e.bseq
[107908.985251] Bluetooth: hci0: Intel Bluetooth firmware patch completed and activated
[109042.464364] Bluetooth: hci0: read Intel version: 370810011003110e00
[109042.464372] Bluetooth: hci0: Intel Bluetooth firmware file: intel/ibt-hw-37.8.10-fw-1.10.3.11.e.bseq
[109042.782838] Bluetooth: hci0: Intel Bluetooth firmware patch completed and activated
[109052.807963] Bluetooth: hci0: read Intel version: 370810011003110e00
[109052.807968] Bluetooth: hci0: Intel Bluetooth firmware file: intel/ibt-hw-37.8.10-fw-1.10.3.11.e.bseq
[109053.127969] Bluetooth: hci0: Intel Bluetooth firmware patch completed and activated
[127570.876446] Bluetooth: hci0: read Intel version: 370810011003110e00
[127570.953632] Bluetooth: hci0: Intel Bluetooth firmware file: intel/ibt-hw-37.8.10-fw-1.10.3.11.e.bseq
[127571.270715] Bluetooth: hci0: Intel Bluetooth firmware patch completed and activated

```