Firefox 96 on Gnome 41.2 is still affected. These settings seem to help
though. Also the other one should be multiplier_y.

> 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.

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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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