Ubuntu
gtk+3.0 package

Display scaling 150% causes Firefox and Chrome to return window.devicePixelRatio = 2

Bug #1895164 reported by Daniel Cheung
6
This bug affects 1 person
Affects Status Importance Assigned to Milestone
gtk+3.0 (Ubuntu)
New
Low
Unassigned
mutter (Ubuntu)
New
Low
Unassigned

Bug Description

## Steps to reproduce

1. Use Ubuntu 20.04 with an Nvidia graphics card with GNOME Desktop.
2. Set display scaling to any fractional value (150%)
3. open up Firefox/Chrome/Chromium. Open up Console and type `window.devicePixelRatio`

## What happened

I received 2

## What should have happened

I should have gotten 1.5

---

I reported this bug here instead of in Firefox/Chrome because they both report the same value only on Linux. They correctly report 1.5 on Windows, which I believe may be an issue with GNOME.

Revision history for this message
Daniel Cheung (daniel-2345) wrote :

$ printf 'Desktop: %s\nSession: %s\n' "$XDG_CURRENT_DESKTOP" "$GDMSESSION"
Desktop: ubuntu:GNOME
Session: ubuntu

Revision history for this message
Daniel van Vugt (vanvugt) wrote :

It's possible the problem is actually GTK (which sits between Mutter and the apps) only supporting integer scales.

tags: added: focal
tags: added: xrandr-scaling
Changed in gtk+3.0 (Ubuntu):
importance: Undecided → Low
Changed in mutter (Ubuntu):
importance: Undecided → Low
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