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SOLVED: Logitech MX Ergo trackball - pairs but doesn't move
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solarion
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Joined: 29 Apr 2020
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Location: Eastern USA

PostPosted: Wed Apr 29, 2020 1:18 am    Post subject: SOLVED: Logitech MX Ergo trackball - pairs but doesn't move Reply with quote

It's strange, but I've a logitech MX Ergo trackball that pairs over Bluetooth with my laptop just fine, but doesn't do anything (mouse buttons don't respond, pointer doesn't move). Does anyone know what would cause these symptoms?

Bluetooth device is Intel Corporation Dual Band Wireless-AC 8265

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Additional data: bluetooth works fine (I've a cheap bt mouse and headphones that work fine over Bluetooth).

Additonal additional data: I upgraded to Intel Wifi-6 AX200 w/ Bluetooth 5.1, and it has the same behaviour.

[Moderator edit: Moved poster's self-response into main post, then deleted that self-response to return the thread to the unanswered list.

OP: Generally, if post length permits, you should edit extra information into your first post instead of replying to it. Some users run a canned search for threads with zero replies as a way of finding posts to answer. When you replied to yourself, you removed your thread from that list, even though you were not replying to announce that the thread was solved. Thus, they would no longer see your thread on the list of unanswered threads.
-Hu]


Last edited by solarion on Wed May 06, 2020 3:17 am; edited 1 time in total
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solarion
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Joined: 29 Apr 2020
Posts: 2
Location: Eastern USA

PostPosted: Wed May 06, 2020 3:16 am    Post subject: Reply with quote

TL;DR: use bluetoothctl to trust the keyboard or mouse, and make sure you've loaded the uhid kernel module.

Solved! It works fine, if I modprobe uhid.

I found a telltale message with the bluetooth ID in the journal:

bluetoothd[648]: input-hog profile accept failed for XX:XX:XX:XX:XX:XX

This lead me to https://github.com/clearlinux/distribution/issues/956 which had that command. I tried it, and the mouse woke up.

ADDENDUM May 29, 2020:
You will likely need to also trust the device. I had the mouse running fine but then I attached a similar Logitech keyboard (Ergo K860) and it did the same thing: paired fine but no input. I had to get the bluetooth ID of the keyboard and trust it using bluetoothctl (run bluetoothctl, then enter "trust <ID>", exit bluetoothctl and restart the device (or switch the keyboard to a different deivce, then switch back).

I had previously trusted the mouse, while trying to figure out why it wasn't working.

(new TL;DR is part of the addendum)
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