It seems the problem for me is the action of 'turn off' bluetooth.
I dual boot with Windows 10. If I chose to 'reboot' (not shutdown) from
windows and boot into ubuntu, bluetooth will start properly and working
fine. The moment I turned off bluetooth it stop working, even reboot
again.
I past below the output for command `dmesg|grep -i blue` under the
situations of working and not working.
>From the dmesg output, it seems different firmware is being loaded for
the two cases (revision 0.1 works while revision 0.0 not work). I
suspect that the bluetooth daemon modify some of the hardware file when
it is turned off. The same for windows 10, I guess it also modifies some
hardware file on restart.
= WORKING CASE ===
[3.393285] Bluetooth: Core ver 2.21
[3.393293] Bluetooth: HCI device and connection manager initialized
[3.393295] Bluetooth: HCI socket layer initialized
[3.393296] Bluetooth: L2CAP socket layer initialized
[3.393300] Bluetooth: SCO socket layer initialized
[3.403438] Bluetooth: HCI UART driver ver 2.3
[3.403439] Bluetooth: HCI UART protocol H4 registered
[3.403439] Bluetooth: HCI UART protocol BCSP registered
[3.403440] Bluetooth: HCI UART protocol LL registered
[3.403440] Bluetooth: HCI UART protocol ATH3K registered
[3.403441] Bluetooth: HCI UART protocol Three-wire (H5) registered
[3.403491] Bluetooth: HCI UART protocol Intel registered
[3.403504] Bluetooth: HCI UART protocol BCM registered
[3.403504] Bluetooth: HCI UART protocol QCA registered
[3.403505] Bluetooth: HCI UART protocol AG6XX registered
[3.478393] Bluetooth: hci0: Firmware revision 0.1 build 68 week 27 2016
[4.884372] thinkpad_acpi: rfkill switch tpacpi_bluetooth_sw: radio is
unblocked
[5.560960] Bluetooth: BNEP (Ethernet Emulation) ver 1.3
[5.560961] Bluetooth: BNEP filters: protocol multicast
[5.560963] Bluetooth: BNEP socket layer initialized
[ 10.825093] Bluetooth: RFCOMM TTY layer initialized
[ 10.825097] Bluetooth: RFCOMM socket layer initialized
[ 10.825101] Bluetooth: RFCOMM ver 1.11
= END OF WORKING CASE ===
== NOT WORKING CASE =
[3.536266] Bluetooth: Core ver 2.21
[3.536275] Bluetooth: HCI device and connection manager initialized
[3.536276] Bluetooth: HCI socket layer initialized
[3.536278] Bluetooth: L2CAP socket layer initialized
[3.536281] Bluetooth: SCO socket layer initialized
[3.546498] Bluetooth: HCI UART driver ver 2.3
[3.546499] Bluetooth: HCI UART protocol H4 registered
[3.546500] Bluetooth: HCI UART protocol BCSP registered
[3.546500] Bluetooth: HCI UART protocol LL registered
[3.546501] Bluetooth: HCI UART protocol ATH3K registered
[3.546501] Bluetooth: HCI UART protocol Three-wire (H5) registered
[3.546532] Bluetooth: HCI UART protocol Intel registered
[3.546544] Bluetooth: HCI UART protocol BCM registered
[3.546545] Bluetooth: HCI UART protocol QCA registered
[3.546545] Bluetooth: HCI UART protocol AG6XX registered
[3.632162] Bluetooth: hci0: Bootloader revision 0.0 build 26 week 38 2015
[3.633833] Bluetooth: hci0: Device revision is 16
[3.633834] Bluetooth: hci0: Secure boot is enabled
[3.633835] Bluetooth: hci0: OTP lock is enabled
[3.633835] Bluetooth: hci0: API lock is enabled
[3.633836] Bluetooth: hci0: Debug lock is disabled
[3.633836] Bluetooth: hci0: Minimum firmware build 1 week 10 2014
[3.633984] bluetooth hci0: Direct firmware load for intel/ibt-12-16.sfi
failed with error -2
[3.633985] Bluetooth: hci0: Failed to load Intel firmware file (-2)
[3.774670] Bluetooth: hci0: Bootloader revision 0.0 build 26 week 38 2015
[3.777812] Bluetooth: hci0: Device revision is 16
[3.777813] Bluetooth: hci0: Secure boot is enabled
[3.777814] Bluetooth: hci0: OTP lock is enabled
[3.777814] Bluetooth: hci0: API lock is enabled
[3.777814] Bluetooth: hci0: Debug lock is disabled
[3.777815] Bluetooth: hci0: Minimum firmware build 1 week 10 2014
[3.777913] bluetooth hci0: Direct firmware load for intel/ibt-12-16.sfi
failed with error -2
[3.777915] Bluetooth: hci0: Failed to load Intel firmware file (-2)
[4.760374] thinkpad_acpi: rfkill switch tpacpi_bluetooth_sw: radio is
unblocked
[5.455861] Bluetooth: BNEP (Ethernet Emulation) ver 1.3
[5.455866] Bluetooth: BNEP filters: protocol multicast
[5.455889] Bluetooth: BNEP socket layer initialized
= END OF NOT WORKING CASE ===
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https://bugs.launchpad.net/bugs/1561474
Title:
Bluetooth will be disable after resume from suspend on Xenial
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