brave/brave-browser

No Way to Shrink UI Fonts in Brave on Kubuntu 25.04 (KDE Plasma 6 + Wayland)

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#49,553 opened on 2025年9月23日

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OS/DesktopOS/Linuxhelp wanted

説明

Description

Brave’s UI fonts (tab labels, menus, settings) are excessively large on Kubuntu 25.04 running KDE Plasma 6.4.5 with Wayland. There is currently no reliable way to reduce UI font size without affecting the entire desktop or introducing rendering glitches.

Steps to reproduce

  1. Launch Brave using --ozone-platform=wayland

  2. Observe oversized UI fonts compared to other KDE apps

  3. Attempt to shrink UI fonts using:

--force-device-scale-factor=0.9 → causes window bleed across monitors

Fontconfig overrides (FONTCONFIG_PATH) → no effect

KDE font settings → affects all apps, not Brave-only

GTK/GDK environment variables → ignored

Flatpak version → same behavior

Actual result

UI fonts remain large and unresponsive to all known scaling methods under Wayland. --force-device-scale-factor causes visual glitches in multi-monitor setups.

Expected result

Brave should respect system font scaling or provide a way to adjust UI font size independently of global DPI or device scale.

Reproduces how often

Easily reproduced

Brave version (brave://version info)

OS: Kubuntu 25.04

Desktop: KDE Plasma 6.4.5

Session: Wayland

Brave Version: 1.82.170

Chromium Version: 140.0.7339.186

Display Setup: Dual monitors

Resolution: 1920×1080 px @ 100 Hz

Physical size: 527×296 mm (23.8 inches)

Pixel density: ~92.57 PPI (low-DPI)

Channel information

  • release (stable)
  • beta
  • nightly

Reproducibility

  • with Brave Shields disabled
  • with Brave Rewards disabled
  • in the latest version of Chrome

Miscellaneous information

No response

コントリビューターガイド

技術スタック
ccppcss
領域
frontenddesktopaccessibility
Issue 種別
bug
難度新しい貢献者にとっての実装難度です。1 は非常に小さな変更、5 は専門的な作業です。
4
推定時間経験ある貢献者が調査、実装、テスト、pull request 準備にかけるおおよその時間範囲です。
over 1 week
活動状況Issue が今どれだけ取り組みやすいかを示します。新しい、活発、古い、ブロック中、またはメンテナー入力待ちなどです。
fresh
明確さ期待される変更、受け入れ条件、次の手順がどれだけ明確かを示します。
clear
前提条件
なし
初心者向け度初回貢献者にどれだけ取り組みやすいかを 1-100 で推定したスコアです。
20
調査方針
Investigate Chromium's font scaling and UI sizing logic on Linux with Wayland. Key areas include `ui/gfx/font`, `ui/linux`, and the handling of ` force device scale factor` and fontconfig overrides. Review existing Chromium bugs related to font scaling on KDE/Plasma and Wayland. Consider how Brave could implement a per application font size override without relying on global DPI scaling.