Q:

Bluetooth not work on elementary os 0.4 Loki

I've installed elementary OS on my laptop but bluetooth doesn't recognize any device, can someone help me? I'm not expert with the ubuntu system...and sorry for my english
03:00.0 Ethernet controller [0200]: Realtek Semiconductor Co., Ltd. RTL8101/2/6E PCI Express Fast/Gigabit Ethernet controller [10ec:8136] (rev 0a)
    Subsystem: Lenovo RTL8101/2/6E PCI Express Fast/Gigabit Ethernet controller [17aa:3830]
    Kernel driver in use: r8169
    Kernel modules: r8169
04:00.0 Network controller [0280]: Realtek Semiconductor Co., Ltd. RTL8723BE PCIe Wireless Network Adapter [10ec:b723]
    Subsystem: XAVi Technologies Corp. RTL8723BE PCIe Wireless Network Adapter [1b9a:2485]
    Kernel driver in use: rtl8723be
    Kernel modules: rtl8723be, wl

Bus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
Bus 001 Device 004: ID 04f2:b49f Chicony Electronics Co., Ltd 
Bus 001 Device 003: ID 174f:1169 Syntek 
Bus 001 Device 002: ID 062a:4102 Creative Labs 
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub

0: ideapad_wlan: Wireless LAN
    Soft blocked: no
    Hard blocked: no
1: ideapad_bluetooth: Bluetooth
    Soft blocked: no
    Hard blocked: no
2: phy0: Wireless LAN
    Soft blocked: no
    Hard blocked: no
4: hci0: Bluetooth
    Soft blocked: no
    Hard blocked: no

    [    0.160519] [Firmware Bug]: ACPI: BIOS _OSI(Linux) query ignored
[    0.364113] acpi PNP0A08:00: [Firmware Info]: MMCONFIG for domain 0000 [bus 00-3f] only partially covers this bridge
[    1.466117] [Firmware Bug]: No valid trip found
[    2.610072] usb 1-4: Product: Bluetooth Radio 
[   10.398181] rtl8723be: Using firmware rtlwifi/rtl8723befw.bin
[   11.842460] Bluetooth: Core ver 2.21
[   11.842487] Bluetooth: HCI device and connection manager initialized
[   11.842493] Bluetooth: HCI socket layer initialized
[   11.842498] Bluetooth: L2CAP socket layer initialized
[   11.842508] Bluetooth: SCO socket layer initialized
[   12.626712] Bluetooth: hci0: rtl: examining hci_ver=06 hci_rev=000b lmp_ver=06 lmp_subver=8723
[   12.626719] Bluetooth: hci0: rtl: loading rtl_bt/rtl8723b_fw.bin
[   12.698802] Bluetooth: hci0: rom_version status=0 version=1
[   17.016934] Bluetooth: BNEP (Ethernet Emulation) ver 1.3
[   17.016940] Bluetooth: BNEP filters: protocol multicast
[   17.016947] Bluetooth: BNEP socket layer initialized
[   19.079058] Bluetooth: hci0 command 0x0c56 tx timeout
[   38.328458] Bluetooth: RFCOMM TTY layer initialized
[   38.328470] Bluetooth: RFCOMM socket layer initialized
[   38.328483] Bluetooth: RFCOMM ver 1.11
[ 1171.588454] Bluetooth: hci0: rtl: examining hci_ver=06 hci_rev=000b lmp_ver=06 lmp_subver=8723
[ 1171.588462] Bluetooth: hci0: rtl: loading rtl_bt/rtl8723b_fw.bin
[ 1171.589660] Bluetooth: hci0: rom_version status=0 version=1
[ 3599.475358] Bluetooth: hci0: rtl: examining hci_ver=06 hci_rev=000b lmp_ver=06 lmp_subver=8723
[ 3599.475364] Bluetooth: hci0: rtl: loading rtl_bt/rtl8723b_fw.bin
[ 3599.476353] Bluetooth: hci0: rom_version status=0 version=1

Results from dmesg | grep 'usb 1-4'
[ 2.432072] usb 1-4: new full-speed USB device number 4 using xhci_hcd 
[ 2.561475] usb 1-4: New USB device found, idVendor=04f2, idProduct=b49f 
[ 2.561481] usb 1-4: New USB device strings: Mfr=1, Product=2, SerialNumber=3 
[ 2.561484] usb 1-4: Product: Bluetooth Radio 
[ 2.561487] usb 1-4: Manufacturer: Realtek 
[ 2.561489] usb 1-4: SerialNumber: 00e04c000001 
[16443.840076] usb 1-4: reset full-speed USB device number 4 using xhci_hcd 
[41178.579274] usb 1-4: reset full-speed USB device number 4 using xhci_hcd

A:

maybe your bluetooth is soft blocked? try :
sudo rfkill list

if it is blocked, try this command 
sudo rfkill unblock bluetooth

hope it helps!

