18.04 Bluetooth KB (Logitech K480) disconnections

[shochatd]

I was going to post in Wireless, but the only existing thread on the K480 was here. The existing thread was about pairing but that's not my problem. The KB works fine unless I'm away for a while. Often, I have to hit a key a few times before it seems to "wake up" but sometimes that doesn't work. So I go into Bluetooth Settings and see that the K480 is "disconnected" (the blue light on the KB is blinking at this point which makes me think it's trying to connect). I click the "switch" to go from "Off" to "On", but then it jumps right back to "Off". I have a workaround, which is to turn off the physical switch on the back of the KB and then back on again. When I do that, it reconnects by itself with no intervention on my part. Is there a fix?

[shochatd]

This problem persists in 18.10.

[him610]

My keyboard doesn’t work after the connected PC wakes from sleep mode.
On the PC, change the Bluetooth wireless adapter power settings:
Go to Control Panel > System and Security > System > Device Manager.

In Bluetooth Radios, right-click on the Bluetooth wireless adapter (for example, Dell Wireless 370 adapter) and click Properties.

In the Properties window, click the Power Management tab and uncheck Allow the computer to turn off this device to save power.

Click OK to save the settings and restart the PC.

RE: https://www.logitech.com/en-us/manua...guide#section8

[shochatd]

RE: https://www.logitech.com/en-us/manua...guide#section8

Thanks for the reply. This sounds encouraging, except for one thing: These instructions appear to be for Windows. What can I do on Ubuntu that would correspond to this?

[him610]

These instructions appear to be for Windows

Sometimes, one needs to use the windows procedures to figure out the Ubuntu procedures.

Consider:
Ubuntu Settings > [ Bluetooth Adapters | Bluetooth Manager ]

Bluetooth Adapter is the equivalent of Bluetooth Radio (Windows)
Bluetooth Manager is where you can pair your Bluetooth devices with your Bluetooth Adapter

Someone once said The Lord helps those who help themselves.

[shochatd]

Sometimes, one needs to use the windows procedures to figure out the Ubuntu procedures.

Consider:
Ubuntu Settings > [ Bluetooth Adapters | Bluetooth Manager ]

Bluetooth Adapter is the equivalent of Bluetooth Radio (Windows)
Bluetooth Manager is where you can pair your Bluetooth devices with your Bluetooth Adapter

Someone once said The Lord helps those who help themselves.

So how do I access this? The only "Settings" area I can find in Ubuntu 18.10 is what you get when you click the upper-right corner of the screen and then the wrench icon. There is an item there called "Bluetooth", but no "Bluetooth Adapters" or "Bluetooth Manager".
If I select "Bluetooth", I can see a few paired devices (including my keyboard), but that has only a single "connect" switch. No configuration options at all. I've installed bluez-tools which includes the command-line tools bt-adapter and bt-device. I tried both with the results below:
$ bt-adapter -i 'Keyboard K480'
[hci0]
Name: ratel #1
Address: A4:34:D9:08:D4:86
Alias: ratel #1 [rw]
Class: 0x1c0104
Discoverable: 1 [rw]
DiscoverableTimeout: 0 [rw]
Discovering: 0
Pairable: 1 [rw]
PairableTimeout: 0 [rw]
Powered: 1 [rw]
UUIDs: [HeadsetAudioGateway, 00001801-0000-1000-8000-00805f9b34fb, AVRemoteControl, OBEXFileTransfer, 00001800-0000-1000-8000-00805f9b34fb, OBEXObjectPush, PnPInformation, AVRemoteControlTarget, IrMCSync, AudioSource, AudioSink, 00005005-0000-1000-8000-0002ee000001, 00001133-0000-1000-8000-00805f9b34fb, PhoneBookAccess, 00001132-0000-1000-8000-00805f9b34fb, Headset]

$ bt-device -i 'Keyboard K480'
[34:88:5D:71:42:D6]
Name: Keyboard K480
Alias: Keyboard K480 [rw]
Address: 34:88:5D:71:42:D6
Icon: input-keyboard
Class: 0x540
Paired: 1
Trusted: 1 [rw]
Blocked: 0 [rw]
Connected: 0
UUIDs: [ServiceDiscoveryServer, HumanInterfaceDevice, PnPInformation]

None of this seems to shed any light on my problem. It also does not seem to uncover any configuration options like the ones in the Windows documentation.

[him610]

You should be able to run Bluetooth Manager from the command line...

blueman-manager

[shochatd]

Okay, when I run that, I see my keyboard (Keyboard K480)
I click Setup.
Connect is highlighted on the left. On the right, Connect to and the radio button "Human Interface Device Service (HID)" is selected.
I click Next.
Now Finished is highlighted on the left. On the right, "Device added and connected successfully".

So where are the configuration options?

[monosyllabicbabbling]

I had a very similar problem with a bluetooth mouse, turned out to be a trust issue. I was able to fix it following these instructions:
https://ubuntuforums.org/showthread.php?t=2390542

[shochatd]

I had a very similar problem with a bluetooth mouse, turned out to be a trust issue. I was able to fix it following these instructions:
https://ubuntuforums.org/showthread.php?t=2390542

Thanks, but your problem seems to be a pairing issue. My keyboard has remained paired throughout. Also, restarting the computer does not cause any problems. And notice that the output of bt-device showed Trusted: 1 (which I assume means true). Nevertheless, bluetoothctl is a command I have not yet explored. I'll see if it leads to anything relevant to my problem.