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I tried multiple "solutions" but nothing worked. I can't try to use USB 2.0 because the laptop only has 2 usb3.0. tried:

20.04 USB keyboard and mouse lag

laggy mouse pointer in ubuntu 20.04

How can I get rid of mouse lag under Ubuntu?

Ubuntu 20.04.1 LTS GNOME 3.36.3 periodic mouse and keyboard lag

Also, it's not the screen refresh hz since the laptops touchpad is working fine.

Daryl
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  • Do you have anything else on the USB bus, such as a large amount of storage, an external video card, or a monitor? – matigo Dec 28 '21 at 10:48
  • nothing, only the usb dongle for the mouse, not even a keyboard – Daryl Dec 28 '21 at 11:00
  • Are you using PowerTop or another power management system? If so, this could be putting the dongle into a low-power mode, which would reduce overall throughput – matigo Dec 28 '21 at 12:53
  • no, I'm not using any kind of power management system. It's nearly brand new installed os. Only some apps for programming and the necessary packs for those few languages – Daryl Dec 28 '21 at 13:08

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