Comment 0 for bug 1603715

DELL Latitude E5510 has a hardware switch to disable and enable bluetooth and wifi devices ("hard blocking" in terms of rfkill. In terms of wifi, this works great: After hard unblocking the device resumes to normal operation with no manual intervention. That was also working with bluetooth as of 14.04, kernel 4.2.

In ubuntu 16.04, kernel 4.4.0-31-generic, together with systemd, this is not working any more:

After hard blocking and unblocking

- bluetooth is not working at all
- the applet-indicator remains gray
- bluetooth cannot be enabled with the applet-indicator (see https://storage6.static.itmages.com/i/16/0717/h_1468721829_7715160_83cd33bfba.png). Applet-indicator remains gray
- rfkill list tells me that the kernel knows about the hard unblocking (turns from "yes" to "no"):
rfkill list bluetooth
2: dell-bluetooth: Bluetooth
 Soft blocked: no
 Hard blocked: no
8: hci0: Bluetooth
 Soft blocked: no
 Hard blocked: no

The device is a
sudo lsusb
Bus 002 Device 010: ID 413c:8187 Dell Computer Corp. DW375 Bluetooth Module

Workaround: After a

sudo service bluetooth restart

the bluetooth device turns back to normal operation and the applet-indicator turns from gray to black (available).

Suggested fix: Make the workaround obsolete.

ProblemType: Bug
DistroRelease: Ubuntu 16.04
Package: systemd 229-4ubuntu6
ProcVersionSignature: Ubuntu 4.4.0-31.50-generic 4.4.13
Uname: Linux 4.4.0-31-generic x86_64
ApportVersion: 2.20.1-0ubuntu2.1
Architecture: amd64
CurrentDesktop: GNOME-Flashback:Unity
Date: Sun Jul 17 04:00:58 2016
InstallationDate: Installed on 2014-11-29 (595 days ago)
InstallationMedia: Ubuntu 14.04.1 LTS "Trusty Tahr" - Release amd64 (20140722.2)
MachineType: Dell Inc. Latitude E5510
ProcKernelCmdLine: BOOT_IMAGE=/@/boot/vmlinuz-4.4.0-31-generic root=UUID=6408c2d9-1b60-43d7-9a7f-2dceeb40de28 ro rootflags=subvol=@ quiet splash vt.handoff=7
SourcePackage: systemd
UpgradeStatus: Upgraded to xenial on 2016-06-15 (31 days ago)
dmi.bios.date: 12/06/2013
dmi.bios.vendor: Dell Inc.
dmi.bios.version: A16
dmi.board.name: 023HKR
dmi.board.vendor: Dell Inc.
dmi.board.version: A00
dmi.chassis.type: 9
dmi.chassis.vendor: Dell Inc.
dmi.modalias: dmi:bvnDellInc.:bvrA16:bd12/06/2013:svnDellInc.:pnLatitudeE5510:pvr0001:rvnDellInc.:rn023HKR:rvrA00:cvnDellInc.:ct9:cvr:
dmi.product.name: Latitude E5510
dmi.product.version: 0001
dmi.sys.vendor: Dell Inc.