1667669 - Interface is broken in Wayland if layout.css.devPixelsPerPx is modified

Status: RESOLVED DUPLICATE of bug 1634404

(Core :: Widget: Gtk, defect)

Description

[filman230]

Attachment: Hambuger button.png

User Agent: Mozilla/5.0 (X11; Linux x86_64; rv:83.0) Gecko/20100101 Firefox/83.0

Steps to reproduce:

In about:config, change "layout.css.devPixelsPerPx" to another value, for example 1.25
Start Firefox in terminal with MOZ_ENABLE_WAYLAND=1

Actual results:

Many interface elements have a large offset, they appear at the wrong place, such as the menu that appears when you click on the "hamburger button" (see attachment)

Both Firefox stable and nightly are affected, I'm running Firefox on GNOME Wayland 3.36.

Comment 1

[BugBot [:suhaib / :marco/ :calixte]]

Bugbug thinks this bug should belong to this component, but please revert this change in case of error.

Comment 2

[ian-s-mcb]

I can confirm this issue. I am using Firefox v.81 (the latest version with my package manager) and Sway (a Wayland desktop manager) with the environment variable: MOZ_ENABLE_WAYLAND=1.

This issue is preventing me from using my 4K monitor at a reasonable scaling factor.

Comment 3

[ian-s-mcb]

Hmm, this bug report is a duplicate of https://bugzilla.mozilla.org/show_bug.cgi?id=1634404, which was reported 5 months ago. I'll follow the discussion there.

Comment 4

[filman230]

That's right... How did I manage to not find it ?