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[Phillip Killewald <1209124@xxxxxxxxxxxxxxxxxx>]

This bug seems to be affecting me as well.  I have the same laptop as
kanor mentions, the ASUS UX301LA.  When the bluetooth device is blocked
via rfkill, the hci0 device shows up properly under hciconfig.  However,
when the bluetooth device is unblocked, hci0 vanishes.

For example:

$ sudo rfkill block bluetooth
$ sudo rfkill list
0: phy0: Wireless LAN
	Soft blocked: no
	Hard blocked: no
1: asus-wlan: Wireless LAN
	Soft blocked: no
	Hard blocked: no
2: asus-bluetooth: Bluetooth
	Soft blocked: yes
	Hard blocked: no
5: hci0: Bluetooth
	Soft blocked: yes
	Hard blocked: no
$ sudo hciconfig -a
hci0:	Type: BR/EDR  Bus: USB
	BD Address: 5C:51:4F:0F:42:4E  ACL MTU: 1021:5  SCO MTU: 96:5
	DOWN 
	RX bytes:1016 acl:0 sco:0 events:104 errors:0
	TX bytes:16335 acl:0 sco:0 commands:103 errors:0
	Features: 0xff 0xfe 0x0f 0xfe 0xdb 0xff 0x7b 0x87
	Packet type: DM1 DM3 DM5 DH1 DH3 DH5 HV1 HV2 HV3 
	Link policy: RSWITCH HOLD SNIFF 
	Link mode: SLAVE ACCEPT 

$ sudo rfkill unblock bluetooth
$ sudo rfkill list
0: phy0: Wireless LAN
	Soft blocked: no
	Hard blocked: no
1: asus-wlan: Wireless LAN
	Soft blocked: no
	Hard blocked: no
2: asus-bluetooth: Bluetooth
	Soft blocked: no
	Hard blocked: no
$ sudo hciconfig -a
[no output]

What's even more interesting is that the device disappears from lsusb
output:

$ sudo rfkill block bluetooth
$ sudo lsusb -d 8087:07dc
Bus 002 Device 007: ID 8087:07dc Intel Corp. 
$ sudo rfkill unblock bluetooth
$ sudo lsusb -d 8087:07dc
[no output]

Relevant information:

$ dmesg | grep -i bluetooth
[    9.128331] Bluetooth: Core ver 2.16
[    9.128723] Bluetooth: HCI device and connection manager initialized
[    9.128731] Bluetooth: HCI socket layer initialized
[    9.128734] Bluetooth: L2CAP socket layer initialized
[    9.128741] Bluetooth: SCO socket layer initialized
[    9.135096] Bluetooth: BNEP (Ethernet Emulation) ver 1.3
[    9.135100] Bluetooth: BNEP filters: protocol multicast
[    9.135107] Bluetooth: BNEP socket layer initialized
[    9.143738] Bluetooth: RFCOMM TTY layer initialized
[    9.143751] Bluetooth: RFCOMM socket layer initialized
[    9.143753] Bluetooth: RFCOMM ver 1.11
[   10.067400] Bluetooth: hci0: read Intel version: 370710018002030d2e
[   10.067404] Bluetooth: hci0: Intel device is already patched. patch num: 2e
[ 1112.489206] Bluetooth: hci0: read Intel version: 370710018002030d00
[ 1112.493990] Bluetooth: hci0: Intel Bluetooth firmware file: intel/ibt-hw-37.7.10-fw-1.80.2.3.d.bseq
[ 1112.645191] Bluetooth: hci0: Intel Bluetooth firmware patch completed and activated

$ uname -a
Linux zadkiel 3.11.0-15-generic #23-Ubuntu SMP Mon Dec 9 18:17:04 UTC 2013 x86_64 x86_64 x86_64 GNU/Linux

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https://bugs.launchpad.net/bugs/1209124

Title:
  Support for Intel 7260 bluetooth [8087:07dc]

Status in “linux” package in Ubuntu:
  Fix Released

Bug description:
  Some 7260 modules are found in the newly released systems. It needs
  external firmware to work. Support for this module can be found in
  3.10 and need to be backported to 3.5 and 3.8.

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