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Old 12-19-2017, 02:52 PM   #5
znd0
Junior Member
 
Join Date: Dec 2017
Posts: 4
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I have the same problem on my Dell Inspiron 5567 running on latest BIOS with this device:
Code:
[    2.089910] usb 2-1.1: new SuperSpeed USB device number 3 using xhci_hcd
[    2.110672] usb 2-1.1: New USB device found, idVendor=17e9, idProduct=430a
[    2.110673] usb 2-1.1: New USB device strings: Mfr=1, Product=2, SerialNumber=3
[    2.110674] usb 2-1.1: Product: HP 3005pr USB3.0 Port Replicator
[    2.110674] usb 2-1.1: Manufacturer: DisplayLink
[    2.110675] usb 2-1.1: SerialNumber: 0036614
Also, I'm running latest (x)Ubuntu 16.04:
Quote:
Linux my-hostname 4.10.0-42-generic #46~16.04.1-Ubuntu SMP Mon Dec 4 15:57:59 UTC 2017 x86_64 x86_64 x86_64 GNU/Linux
I've installed the latest DisplayLink USB Graphics Software for Ubuntu 1.4, last updated in October 2017.

The problem appears on both intel and modesetting drivers. Switching driver does not seem to affect how the cursor lags. Actually, it seems to move okay for 1-2 seconds sometimes, but most of the time it lags making the user-experience very bad. No other visible problems, HD video from youtube seems to be okay.

Worth noting that CPU usage of DisplayLinkManager is about 70% all the time, Xorg uses about 25% of CPU.

Also if the DisplayLink port replicator if connected during boot then Xorg would crash every time during the system boot. OS would restart Xorg after it crashes and Xorg works (does not crash) with the DisplayLink port replicator after the first crash. Not sure if it's relevant or correlate with the cursor lag issue.

Also, it seems that cursor lag appeared after I both updated Ubuntu (apt update && apt upgrade) and updated the DisplayLink software.
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