I can confirm this happens on font.family: "Ubuntu", the default fallback font of Chinese seems to be "Droid Sans".
Here's the output of Qt.fontFamilies() on our Chinese image: qml: DejaVu Sans,DejaVu Sans Mono,DejaVu Serif,Droid Arabic Kufi,Droid Arabic Naskh,Droid Naskh Shift Alt,Droid Sans,Droid Sans Arabic,Droid Sans Armenian,Droid Sans Ethiopic,Droid Sans Fallback,Droid Sans Georgian,Droid Sans Hebrew,Droid Sans Japanese,Droid Sans Mono,Droid Serif,Liberation Mono,Liberation Sans,Liberation Sans Narrow,Liberation Serif,Lohit Devanagari,Monospace,NanumBarunGothic,NanumGothic,NanumMyeongjo,Sans Serif,Serif,Symbola,TakaoPGothic,Ubuntu,Ubuntu Condensed,Ubuntu Mono,文泉驿微米黑,文泉驿等宽微米黑 -- You received this bug notification because you are a member of Ubuntu Touch seeded packages, which is subscribed to ubuntu-ui-toolkit in Ubuntu. https://bugs.launchpad.net/bugs/1475205 Title: Random Chinese character missing with Ubuntu font Status in Canonical System Image: Confirmed Status in ubuntu-font-family-sources package in Ubuntu: New Status in ubuntu-ui-toolkit package in Ubuntu: Invalid Bug description: After applied 50 GU setting in image, we started seeing randomly missing Chinese characters across scopes and apps header, not clipped at the begin or end of string, sometimes in the middle. STEPS: 1. Switch display language to zh_CN in system settings 2. Reboot the phone EXPECTED: I should see all header strings displayed properly. ACTUAL: Randomly missing character. VERSIONS: current build number: 51 device name: arale channel: ubuntu-touch/rc-proposed/meizu.zh-proposed last update: 2015-07-16 04:59:10 version version: 51 version ubuntu: 20150716 version device: 20150709-8965e37 version custom: 20150716-819-9-6 ---------- update ---------- The problem of missing characters can be reproduced even on a desktop, outside of the header, without importing Ubuntu.Components: import QtQuick 2.0 Item { width: 800 height: 600 Text { anchors.centerIn: parent text: "系统设置 one two" font.family: "Ubuntu" font.pixelSize: 69 font.weight: Font.Light } } The problem only appears to occur with this specific combination of font family, pixelSize and weight. Tim Peeters reproduced the problem on vivid on a laptop without changing the default settings for the language (LANGUAGE="en_US"). To manage notifications about this bug go to: https://bugs.launchpad.net/canonical-devices-system-image/+bug/1475205/+subscriptions -- Mailing list: https://launchpad.net/~touch-packages Post to : touch-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~touch-packages More help : https://help.launchpad.net/ListHelp