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On 2020-01-21T12:11:07+00:00 Vincent-liao wrote:

User Agent: Mozilla/5.0 (X11; Fedora; Linux x86_64; rv:72.0)
Gecko/20100101 Firefox/72.0

Steps to reproduce:

Open firefox wayland and start browsing on trackpad.


Actual results:

The scrolling is very unnatural and fast, it's uncomfortable to use.


Expected results:

The scrolling of wayland and x11 should be the same, but it's not.

Reply at:
https://bugs.launchpad.net/ubuntu/+source/mutter/+bug/1922047/comments/0

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On 2020-01-21T12:16:08+00:00 Vincent-liao wrote:

Created attachment 9122009
The video showing the normal scrolling behavior on firefox x11

Reply at:
https://bugs.launchpad.net/ubuntu/+source/mutter/+bug/1922047/comments/1

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On 2020-01-21T12:17:18+00:00 Vincent-liao wrote:

Created attachment 9122010
The video showing the weird scrolling behavior on firefox wayland

Reply at:
https://bugs.launchpad.net/ubuntu/+source/mutter/+bug/1922047/comments/2

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On 2020-01-21T12:17:27+00:00 Release-mgmt-account-bot wrote:

[Bugbug](https://github.com/mozilla/bugbug/) thinks this bug should
belong to this component, but please revert this change in case of
error.

Reply at:
https://bugs.launchpad.net/ubuntu/+source/mutter/+bug/1922047/comments/3

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On 2020-02-05T10:25:31+00:00 Daniel van Vugt wrote:

I can confirm this bug. `MOZ_ENABLE_WAYLAND` looks very promising but
the touchpad scrolling is too fast to be controllable.

Last time I spoke to the libinput maintainer about this subject (other
toolkits are guilty of the same bug) he said the ideal touchpad
scrolling speed is the unaccelerated speed of cursor movement. I would
tend to agree.

Reply at:
https://bugs.launchpad.net/ubuntu/+source/mutter/+bug/1922047/comments/4

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On 2020-05-31T00:55:34+00:00 2-me-b wrote:

I can also confirm this bug. On my trackpad, the scrolling speed on
wayland is almost uncontrollable. More precisely, the inertia is almost
zero. When I do a small "flick" on X11, it will scroll about 1/3 of the
screen then stop. On wayland, it will scroll probably 8 screens worth of
content (if the page is that long) before it comes to a stop.

I tested this on the latest nightly and there is no change.

Reply at:
https://bugs.launchpad.net/ubuntu/+source/mutter/+bug/1922047/comments/5

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On 2020-06-01T08:44:33+00:00 Oigevald+mozilla wrote:

Related https://gitlab.gnome.org/GNOME/gtk/-/issues/1308 "two-finger scrolling 
is far too fast".
This is a general problem with GNOME/GTK, though Firefox might exacerbate the 
issue.

Reply at:
https://bugs.launchpad.net/ubuntu/+source/mutter/+bug/1922047/comments/6

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On 2020-10-06T22:40:44+00:00 Cwestkaemper wrote:

I can confirm the bug is present on wayland, but not in xwayland or
native x11. Furthermore, my GTK apps do not appear to be exhibiting the
same issue, so I doubt that GTK is responsible, although I am not
knowledgeable enough to say for sure.

Reply at:
https://bugs.launchpad.net/ubuntu/+source/mutter/+bug/1922047/comments/7

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On 2021-02-09T23:17:07+00:00 Vincent Chernin wrote:

(In reply to Yariv from comment #6)
> Related https://gitlab.gnome.org/GNOME/gtk/-/issues/1308 "two-finger 
> scrolling is far too fast".
> This is a general problem with GNOME/GTK, though Firefox might exacerbate the 
> issue.

It appears that the above upstream linked bug has been closed due to the
confusing array of comments. There appears to be another issue opened
for it though: https://gitlab.gnome.org/GNOME/gtk/-/issues/3631

I agree that firefox seems to somehow exacerbate the gtk issue, perhaps
since one often wants to scroll to a very specific part of the page.
Also, the scrolling behaviour can be very easily compared to other
operating systems by opening the same webpages.

Reply at:
https://bugs.launchpad.net/ubuntu/+source/mutter/+bug/1922047/comments/8

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On 2021-02-10T01:41:12+00:00 Daniel van Vugt wrote:

I would be surprised if this was related to the GTK issue because GTK
was never as dramatically fast as `MOZ_ENABLE_WAYLAND` seems to be.
Maybe Firefox exacerbates the issue as you say, but either way it feels
like Firefox needs its own unique fix. Please don't just wait for a GTK
fix and expect that to also fix Firefox.

Reply at:
https://bugs.launchpad.net/ubuntu/+source/mutter/+bug/1922047/comments/9

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On 2021-03-19T10:03:49+00:00 Till Schäfer wrote:

I can confirm this for Firefox 86.0.1

Operating System: Gentoo Linux
KDE Plasma Version: 5.21.3
KDE Frameworks Version: 5.80.0
Qt Version: 5.15.2
Kernel Version: 5.11.7-gentoo
OS Type: 64-bit
Graphics Platform: Wayland
Processors: 8 × Intel® Core™ i7-4810MQ CPU @ 2.80GHz
Memory: 15.5 GiB of RAM
Graphics Processor: Mesa DRI Intel® HD Graphics 4600

Reply at:
https://bugs.launchpad.net/ubuntu/+source/mutter/+bug/1922047/comments/10

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On 2021-04-06T03:44:51+00:00 Mert Can Demir wrote:

In Windows 10, with the Precision touchpad, unaccelerated scrolling
deltas are used directly. In Firefox and GTK, they are not used
directly, it seems. Also, the scrolling on X11 using XInput2 with
touchpad is also unusable for me, same with GTK. Haven't exactly tested
Wayland though, but for me, it is 1.5xish compared to X11.

I could manage the situation for Firefox as changing
`mousewheel.default.delta_multiplier_x` and
`mousewheel.default.delta_multiplier_x` from 100 to 30, and
`mousewheel.min_line_scroll_amount` from 5 to 180. With deltas, I could
manage touchpad scrolling speed usable, and with
`min_line_scroll_amount` one, mouse doesn't be affected by the delta
reduction command. These are my findings.

Reply at:
https://bugs.launchpad.net/ubuntu/+source/mutter/+bug/1922047/comments/16

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On 2021-04-21T21:09:11+00:00 Botond-2 wrote:

*** Bug 1674218 has been marked as a duplicate of this bug. ***

Reply at:
https://bugs.launchpad.net/ubuntu/+source/mutter/+bug/1922047/comments/17

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On 2021-05-26T14:58:59+00:00 Strangiato Xanadu wrote:

Firefox 89 beta running on Wayland session of KDE Plasma is affected.

Reply at:
https://bugs.launchpad.net/ubuntu/+source/mutter/+bug/1922047/comments/18

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On 2021-12-09T06:31:19+00:00 Hunter Nightblood wrote:

Firefox 95.0 on Fedora 35 KDE Wayland Session is also affected. It kind
of feels like using touch screen scrolling without the touch screen.

Reply at:
https://bugs.launchpad.net/ubuntu/+source/mutter/+bug/1922047/comments/19


** Changed in: firefox
       Status: Unknown => New

** Changed in: firefox
   Importance: Unknown => Medium

-- 
You received this bug notification because you are a member of Ubuntu
Touch seeded packages, which is subscribed to gtk+3.0 in Ubuntu.
https://bugs.launchpad.net/bugs/1922047

Title:
  Touchpad scrolling is too fast

Status in Mozilla Firefox:
  New
Status in GTK+:
  Unknown
Status in Mutter:
  Unknown
Status in firefox package in Ubuntu:
  Confirmed
Status in gtk+3.0 package in Ubuntu:
  Confirmed
Status in gtk4 package in Ubuntu:
  Confirmed
Status in mutter package in Ubuntu:
  Confirmed

Bug description:
  This is an issue which has troubled me for a while. Anecdotally,
  scrolling feels way too fast in GNOME on Wayland compared to on X11. I
  finally tested it semi-scientifically, and it seems like GNOME on
  Wayland scrolls almost exactly 1.5x faster than GNOME on X11.

  I tested this by testing how many lines are scrolled from a full two-
  finger touchpad swipe from the bottom of my touchpad to the top of my
  touchpad, and logged a few attempts in both X and Wayland. I kept
  track of the results in this spreadsheet:
  
https://docs.google.com/spreadsheets/d/17EaBM5Pgt7GdnnzcN2Vchk4kfT7IZ6i4qZ0zpVRGLhc/edit?usp=sharing

  I scrolled in one of my own GTK applications
  (https://github.com/mortie/lograt) because it lets me easily see how
  many lines I scrolled. Attach is a video of one full scroll on X11 and
  one full scroll on Wayland.

  This testing was performed on a Dell XPS 13 9343, but I've also used
  Ubuntu on a Dell XPS 9575 where GNOME Wayland scrolling also feels way
  too fast. I don't have other hardware to test on.

  This has been an issue on both Ubuntu 20.10 and Ubuntu 21.04.

  ProblemType: Bug
  DistroRelease: Ubuntu 21.04
  Package: gnome-shell 3.38.4-1ubuntu1
  ProcVersionSignature: Ubuntu 5.11.0-13.14-generic 5.11.7
  Uname: Linux 5.11.0-13-generic x86_64
  ApportVersion: 2.20.11-0ubuntu61
  Architecture: amd64
  CasperMD5CheckResult: unknown
  CurrentDesktop: ubuntu:GNOME
  Date: Wed Mar 31 11:44:04 2021
  DisplayManager: gdm3
  InstallationDate: Installed on 2019-11-21 (495 days ago)
  InstallationMedia: Ubuntu 19.10 "Eoan Ermine" - Release amd64 (20191017)
  RelatedPackageVersions: mutter-common 3.38.4-1ubuntu1
  SourcePackage: gnome-shell
  UpgradeStatus: Upgraded to hirsute on 2021-03-16 (14 days ago)

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