Ugly fonts for web/GUI elements using alpha channel

[Alin Trăistaru]

On Xenial, after upgrading chromium-browser from 59 to 60, all text (web pages and browser GUI) that uses an opacity value or a shadow opacity value is rendered very ugly in a "jaggedy-boldish" fashion (see screencaps). The issue is present in Google's official Chrome package as well.

The issue dissapears when unchecking "Use hardware acceleration when available"

===================

Version Information

Data exported 8/10/2017, 7:48:46 PM
Chrome version Chrome/60.0.3112.78
Operating system Linux 4.10.0-28-generic
Software rendering list version 0
Driver bug list version 10.93
ANGLE commit id unknown hash
2D graphics backend Skia/60 a20ae70af542208b06c21413f13c4c86269c0b84-
Command Line /usr/lib/chromium-browser/chromium-browser --disable-new-tab-first-run --enable-user-scripts --ppapi-flash-path=/usr/lib/adobe-flashplugin/libpepflashplayer.so --ppapi-flash-version=26.0.0.151 --disk-cache-dir=/tmp/chrome --show-component-extension-options --disable-component-update --ignore-gpu-blacklist --enable-native-gpu-memory-buffers --enable-pinch --enable-features=CheckerImaging --flag-switches-begin --no-pings --disable-touch-adjustment --enable-gpu-rasterization --enable-offline-auto-reload-visible-only --enable-zero-copy --ignore-gpu-blacklist --num-raster-threads=2 --overscroll-history-navigation=0 --touch-events=disabled --enable-features=CheckerImaging,RunAllFlashInAllowMode --disable-features=PreferHtmlOverPlugins,SafeSearchUrlReporting --flag-switches-end

===================

Driver Information

Initialization time 84
In-process GPU false
Passthrough Command Decoder false
Supports overlays false
Sandboxed true
GPU0 VENDOR = 0x8086, DEVICE= 0x0166
Optimus false
Optimus false
AMD switchable false
Driver vendor Mesa
Driver version 17.3.0
Driver date
Pixel shader version 4.20
Vertex shader version 4.20
Max. MSAA samples 8
Machine model name
Machine model version
GL_VENDOR Intel Open Source Technology Center
GL_RENDERER Mesa DRI Intel(R) Ivybridge Mobile
GL_VERSION 4.2 (Core Profile) Mesa 17.3.0-devel

===================

$ apt policy chromium-browser
chromium-browser:
  Installed: 60.0.3112.78-0ubuntu0.16.04.1293
  Candidate: 60.0.3112.78-0ubuntu0.16.04.1293

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.

[Anton Ivanov (antonivanov)]

Chromium 60.0.3112.78 (Developer Build) Built on Ubuntu , running on Ubuntu 16.04 (64-bit)
Revision a06489456eeba3939f2f058a4e5bd6178e7b3bb9-
OS Linux
JavaScript V8 6.0.286.44
Flash (Disabled)
Command Line /usr/lib/chromium-browser/chromium-browser --enable-pinch --enable-native-gpu-memory-buffers --flag-switches-begin --enable-display-list-2d-canvas --force-gpu-rasterization --enable-zero-copy --ignore-gpu-blacklist --enable-lcd-text --save-page-as-mhtml --enable-smooth-scrolling --flag-switches-end

[Alin Trăistaru (alindt)]

Seems to be fixed in 61.0.3163.79

[Olivier Tilloy (osomon)]

Marking fixed per comment, feel free to re-open if the bug can still be observed.