Ubuntu
gtk+3.0 package

window title has incorrect subpixel antialias on high-dpi screen

Bug #1293497 reported by Andreas E.
24
This bug affects 5 people
Affects Status Importance Assigned to Milestone
gtk+3.0 (Ubuntu)
Confirmed
Low
Unassigned

Bug Description

On a high-dpi screen, the window title has a blurry color-shift (especially noticeable in Radiance) which seems to be caused by sub-pixel anti-aliasing. It is so big that it doesn't achieve the purpose of sub-pixel anti-aliasing.

ProblemType: Bug
DistroRelease: Ubuntu 14.04
Package: unity 7.1.2+14.04.20140313-0ubuntu1
ProcVersionSignature: Ubuntu 3.13.0-17.37-generic 3.13.6
Uname: Linux 3.13.0-17-generic x86_64
.tmp.unity.support.test.0:

ApportVersion: 2.13.3-0ubuntu1
Architecture: amd64
CompizPlugins: No value set for `/apps/compiz-1/general/screen0/options/active_plugins'
CompositorRunning: compiz
CompositorUnredirectDriverBlacklist: '(nouveau|Intel).*Mesa 8.0'
CompositorUnredirectFSW: true
CurrentDesktop: Unity
Date: Mon Mar 17 11:41:32 2014
DistUpgraded: Fresh install
DistroCodename: trusty
DistroVariant: ubuntu
DkmsStatus:
 virtualbox, 4.3.6, 3.13.0-12-generic, x86_64: installed
 virtualbox, 4.3.6, 3.13.0-15-generic, x86_64: installed
 virtualbox, 4.3.6, 3.13.0-17-generic, x86_64: installed
EcryptfsInUse: Yes
GraphicsCard:
 Intel Corporation Haswell-ULT Integrated Graphics Controller [8086:0a16] (rev 09) (prog-if 00 [VGA controller])
   Subsystem: Lenovo Device [17aa:3978]
InstallationDate: Installed on 2014-02-02 (42 days ago)
InstallationMedia: Ubuntu-GNOME 14.04 "Trusty Tahr" - Alpha amd64 (20140201)
MachineType: LENOVO 20266
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.13.0-17-generic.efi.signed root=UUID=4bfb3686-b9f7-487d-81f6-eceb41097ad9 ro quiet splash vt.handoff=7
SourcePackage: unity
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 10/31/2013
dmi.bios.vendor: LENOVO
dmi.bios.version: 76CN31WW
dmi.board.asset.tag: No Asset Tag
dmi.board.name: Yoga2
dmi.board.vendor: LENOVO
dmi.board.version: 31900058STD
dmi.chassis.asset.tag: No Asset Tag
dmi.chassis.type: 10
dmi.chassis.vendor: LENOVO
dmi.chassis.version: Lenovo Yoga 2 Pro
dmi.modalias: dmi:bvnLENOVO:bvr76CN31WW:bd10/31/2013:svnLENOVO:pn20266:pvrLenovoYoga2Pro:rvnLENOVO:rnYoga2:rvr31900058STD:cvnLENOVO:ct10:cvrLenovoYoga2Pro:
dmi.product.name: 20266
dmi.product.version: Lenovo Yoga 2 Pro
dmi.sys.vendor: LENOVO
version.compiz: compiz 1:0.9.11+14.04.20140310-0ubuntu1
version.ia32-libs: ia32-libs N/A
version.libdrm2: libdrm2 2.4.52-1
version.libgl1-mesa-dri: libgl1-mesa-dri 10.1.0-1ubuntu1
version.libgl1-mesa-dri-experimental: libgl1-mesa-dri-experimental N/A
version.libgl1-mesa-glx: libgl1-mesa-glx 10.1.0-1ubuntu1
version.xserver-xorg-core: xserver-xorg-core 2:1.15.0-1ubuntu7
version.xserver-xorg-input-evdev: xserver-xorg-input-evdev 1:2.8.2-1ubuntu2
version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:7.3.0-1ubuntu3
version.xserver-xorg-video-intel: xserver-xorg-video-intel 2:2.99.910-0ubuntu1
version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:1.0.10-1ubuntu2
xserver.bootTime: Mon Mar 17 09:43:54 2014
xserver.configfile: default
xserver.errors:

xserver.logfile: /var/log/Xorg.0.log
xserver.outputs:
 product id 16970
 vendor SDC
xserver.version: 2:1.15.0-1ubuntu7

See original description
Revision history for this message
Andreas E. (andreas-e) wrote :
Revision history for this message
Andreas E. (andreas-e) wrote :
Revision history for this message
Launchpad Janitor (janitor) wrote :

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

Changed in unity (Ubuntu):
status: New → Confirmed
Andreas E. (andreas-e)
description: updated
Revision history for this message
monte (monte3) wrote :

Would like to add that this behavior can be seen not only in title bar. Some programs (gedit for example) and certain gtk elements (as drop-down menus) also has wrong subpixel antialiasing. Changing setting between "rgb" and "bgr" in "/org/gnome/settings-daemon/plugins/xsettings/rgba-order" makes no difference for cases mentioned above. But when changing to "vrgb" or "vbgr" there is visible difference. It looks like some internal gnome or gtk setting is hard set to "bgr" and doesn't get value of "rgb" in any case. Turning monitor and picture 180 degrees confirms this statement - the text is smooth and without any color edges.
In attached screenshot you can see examples of this bug. There is picture of UbuntuTweak window, Cairo Dock tooltip and comparison between text rendering in gedit and leafpad. When you zoom image you can see that in first three cases text have red color shifted to the right, though it has to be shifted to the left.

Marco Trevisan (Treviño) (3v1n0)
Changed in unity:
status: New → Confirmed
Revision history for this message
Sebastien Bacher (seb128) wrote :

LIkely a gkt issue rather than an unity one

Changed in unity:
importance: Undecided → Low
Changed in unity (Ubuntu):
importance: Undecided → Low
no longer affects: unity
affects: unity (Ubuntu) → gtk+3.0 (Ubuntu)
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