I was having the same issue with the latest Arch build (5.10.36 LTS Kernel) on my 2020 Dell Latitude with an i7.
The cursor disappears when you stop moving the mouse, then renders an ugly box artifact around it when moving. I had two 1080P screens hooked up the D6XXX dock, through the USB 3.1 port.
The other annoying thing I noticed that made me just switch back to the standard HDMI port and one external monitor is the CPU usage is ridiculously high with the dock - the same is true in Windows, my work laptop is a higher end DELL with the same i7 and when the dock is connected through it's lightning port the CPU ramps up.
On Linux however - the CPU usage is MUCH higher than even in Windows. I was seeing ~40% usage and about ~4GB of memory usage from the Display link driver while playing a movie through Firefox.
Not worth the glitchy cursor and the high CPU usage (that makes the fan noise unbearable after about ten minutes) just to get an extra monitor.
God's Hacker
I was having the same issue with the latest Arch build (5.10.36 LTS Kernel) on my 2020 Dell Latitude with an i7.
The cursor disappears when you stop moving the mouse, then renders an ugly box artifact around it when moving. I had two 1080P screens hooked up the D6XXX dock, through the USB 3.1 port.
The other annoying thing I noticed that made me just switch back to the standard HDMI port and one external monitor is the CPU usage is ridiculously high with the dock - the same is true in Windows, my work laptop is a higher end DELL with the same i7 and when the dock is connected through it's lightning port the CPU ramps up.
On Linux however - the CPU usage is MUCH higher than even in Windows. I was seeing ~40% usage and about ~4GB of memory usage from the Display link driver while playing a movie through Firefox.
Not worth the glitchy cursor and the high CPU usage (that makes the fan noise unbearable after about ten minutes) just to get an extra monitor.