[Bug 1603715] Re: bluetooth unavailable after rfkill hard (or soft) unblocking

[Thomas Mayer]

Plus, is bluetooth not operational after suspend/resume, while blocks
are not set:

rfkill list bluetooth
2: dell-bluetooth: Bluetooth
	Soft blocked: no
	Hard blocked: no
13: hci0: Bluetooth
	Soft blocked: no
	Hard blocked: no

Again, a "sudo service bluetooth restart" helps after suspend/resume.


** Summary changed:

- bluetooth unavailable after rfkill hard (or soft) unblocking
+ bluetooth unavailable after rfkill hard (or soft) unblocking and after suspend/resume

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Title:
  bluetooth unavailable after rfkill hard (or soft) unblocking and after
  suspend/resume

Status in systemd:
  New
Status in systemd package in Ubuntu:
  New

Bug description:
  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 back to normal operation without any manual intervention. That
  was also working with bluetooth as of ubuntu 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.

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