[Bug 2081672] Re: Scanning not enabled by the Bluetooth slider

[Kai-Chuan Hsieh]

** Description changed:

- [Description]
+ [ Impact ]
  
- Since Noble, turning Bluetooth slider on ON after toggling it OFF for
- ~1min seems to only power on and unblock rfkill on the controller, but
- not enable scanning. This makes the "Devices" list shows no devices, as
- if the controller wasn't functioning.
+  * Turning off bluetooth for over 1 minutes and turn on it in bluetooth panel.
+    There is no devices list, and the bluetooth controller is not discoverable.
  
- This is observable on both Dell XPS 13 Plus and HP Elite Book 1040 x360
- with stock Noble image.
+ [ Test Plan ]
  
- Note that manually executing "scan on" command in the bluetoothctl will
- make scanning in g-c-c back to normal.
+  * Find a machine with bluetooth as the device under test (DUT)
  
- Also note that if leave the Bluetooth slider on, switch to another tab
- in settings, and switch back to the Bluetooth tab, this will somehow
- activate scanning again. New devices will pop up again in the "Devices"
- list.
+  * Open g-c-c bluetooth panel on the DUT
  
- [Steps to reproduce]
+  * Turn off the bluetooth on the DUT for 1 minutes
  
- 1. Open the control center and switch to the Bluetooth tab.
- 2. Toggle ON and OFF the Bluetooth slider and leave it at OFF for 1 minutes.
- 3. Turn it back on.
- 4. At this moment the devices listed "Device" will disappear one by one, and
-    eventually no device will present.
+  * Put another bluetooth gadget to discovery mode
+ 
+  * Turn on the bluetooth on the DUT in the bluetooth panel
+ 
+  * There should be bluetooth device listed, and the DUT is also
+ discoverable
+ 
+ [ Where problems could occur ]
+ 
+  * The powered status is recorded by bluez, if the status in bluez and
+ hardware is asynchronous. It still has problem to put the device into
+ discovery mode.
+ 
+ [ Other Info ]
+ 
+  * Upstream,
+    https://gitlab.gnome.org/GNOME/gnome-bluetooth/-/commit/de707f592304309a59208e3ed1afbe4a37568bdd
+    https://gitlab.gnome.org/GNOME/gnome-bluetooth/-/commit/3d45205c79b48dd3e15e1c4edb58cf8cd79f23ef

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https://bugs.launchpad.net/bugs/2081672

Title:
  Scanning not enabled by the Bluetooth slider

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