Arch Linux

Alcasa

Member

Registered: 2013-05-18

Posts: 46

[Displaylink USB2] Cursor lag on linux 4.7

Since upgrading to linux 4.7 the cursor is really laggy. I am using XFCE with enabled compositing. Interestingly there is no lag in the screen panel, and also no scroll or typing lag, so it isnt a hardware limitation.

I have since downgraded to 4.6 which fixed the problem, but would be really interested what breaking changes might have been introduced. I know there is kernel bisecting, but I hope someone might have stumped onto a similar problem too.

R00KIE

Forum Fellow

From: Between a computer and a chair

Registered: 2008-09-14

Posts: 4,734

Re: [Displaylink USB2] Cursor lag on linux 4.7

Your best bet is bisecting and reporting upstream. Kernel devs don't like regressions and if you bisect and say exactly which commit breaks it for you then you have a good chance that it will be dealt with sooner rather than later. Of course it will help if you are willing to test patches and report if it fixes the problem.

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R00KIE
Tm90aGluZyB0byBzZWUgaGVyZSwgbW92ZSBhbG9uZy4K

seidler2547

Member

Registered: 2014-12-31

Posts: 6

Re: [Displaylink USB2] Cursor lag on linux 4.7

Having the same problem. Rolled back to 4.6 and hoping for 4.8 to fix things - saw a couple of DRM-related changes merged by Linus into the 4.8 branch. The problem is also that udl doesn't receive much attention and udlfb doesn't  work with xrandr.