Bug 1294376 - Two finger scroll feels lagging when using Gnome on Wayland
Two finger scroll feels lagging when using Gnome on Wayland
Product: Fedora
Classification: Fedora
Component: gtk3 (Show other bugs)
x86_64 Linux
unspecified Severity unspecified
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Assigned To: Matthias Clasen
Fedora Extras Quality Assurance
Depends On:
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Reported: 2015-12-27 15:37 EST by Pavel Sklenak
Modified: 2016-12-20 12:25 EST (History)
4 users (show)

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Fixed In Version:
Doc Type: Bug Fix
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Clone Of:
Last Closed: 2016-12-20 12:25:52 EST
Type: Bug
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Attachments (Terms of Use)
device details (evemu-describe, xinput list-props) (5.26 KB, text/plain)
2015-12-27 15:37 EST, Pavel Sklenak
no flags Details

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Description Pavel Sklenak 2015-12-27 15:37:51 EST
Created attachment 1109884 [details]
device details (evemu-describe, xinput list-props)

Two finger scroll provides immediate response with Gnome on X11.
On Wayland there is a kind of an initial lag before the actual scrolling starts. 

I like much more the X behavior.

I am using libinput 1.1.4-1-fc23.
Comment 1 Pavel Sklenak 2015-12-27 16:00:32 EST
Let me add my use case:

I read a webpage and scroll as I read so that the text keeps about at the same position on the screen.

Hope it makes it clearer about what I mean. Thank you for your feedback.
Comment 2 Peter Hutterer 2016-01-03 22:02:46 EST
measured in mm, how far do you think that dead zone is? I don't think that's a libinput bug, we have a dead zone to distinguish between scroll and gestures, but you should see the same zone on both.
Comment 3 Pavel Sklenak 2016-01-04 05:36:29 EST
I am not sure, does acceleration/deceleration apply to scrolling too? 

The pointer speed can be adjusted in preferences and the same setting works fine in both X11/wayland. Difference is in the scrolling behavior. The scrolling on wayland is visually much faster. Perhaps that's the reason why it feels lagging when I try to scroll along with reading, thus making even smaller movements with my fingers.
Comment 4 Peter Hutterer 2016-01-11 22:57:49 EST
I'm punting this to gtk, I'm pretty sure that's the best component to handle this. The cause of this is that we're using slightly different coordinate systems in wayland vs X for scrolling. In X, it's effectively in "scroll units" and it's up to the client to interpret those. In wayland, the scroll motion is in the same coordinate system as the pointer movement. I think this is simply something gtk/gdk needs to handle depending on the backend.
Comment 5 Fedora End Of Life 2016-11-24 09:33:04 EST
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Comment 6 Fedora End Of Life 2016-12-20 12:25:52 EST
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