Bluetooth mouse is laggy (low poll rate...) in 18.04
I had the same problem with a Logitech MX Master 3
Following these steps worked for me:
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1824559/comments/10
Following wysiwyg31's Comment, I did the following:
$ sudo nano /var/lib/bluetooth/xx\:xx\:xx\:xx\:xx\:xx/yy\:yy\:yy\:yy\:yy\:yy/info
where xx:xx.... is pc bluetooth address and yy:yy... is the mouse bluetooth address.
In the file, I added the section at the end:
[ConnectionParameters]
MinInterval=6
MaxInterval=7
Latency=0
Timeout=216
then, I restarted bluetooth service with:
systemctl restart bluetooth
Using https://github.com/ian-kelling/evhz to check the rate (but it was immediately noticeable when the fix worked and 22Hz became 125Hz).
$ cat /sys/module/usbhid/parameters/mousepoll
8
now shows "8" instead of the previeous "0"
This seems to be a problem related to newer kernel versions.
There are suggestions to change the latency parameters of the connected device through hcitool as a workaround but this only works temporarily and has to be repeated for every reconnect.
A method that worked much better for me is to permanently change the latency in a kernel configuration file by following these steps:
- Disconnect / unpair the problematic device.
- Run
echo 6 > /sys/kernel/debug/bluetooth/hci0/conn_min_interval - Connect / pair the device again. A reboot is most probably not required.
The source for this method can be found here.