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[Bug 1446053] [NEW] Font corruption some characters suddenly not rendered after login or after a period of usage

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Public bug reported:

This has occurred multiple times on my machine (Dell Inspiron 13 7000
series laptop), it happens without warning. After which time suddenly
application windows will fail to render certain characters making
everything unreadable. In the past it has happened immediately after
login, this time it happened after ~30 minutes usage from a cold boot.

See attached screenshot.
This doesn't happen for every window, chrome is generally ok, as are the unity launcher. The tools in the system tray and the power off menu are affected, as are nautilus, gedit, and application menus generally.
Rolling over labels sometimes causes them to rener properly while the mouse is over them.

Terminal is fine

There is a workaround which is to change the font antialiasing settings
with unity tweak tool, however this isn't a permanent fix - last time it
was set to RGBA, so I changed it to Grayscale. This time it happened it
was set to Grayscale and I set it to RGBA and it fixes it.

I don't know enough to know whether this is a video driver issue, or a
problem with gtk or what, so it's possible you may need to recategorise
this defect.

One other thing that may be useful info is that twiddling the
antialiasing drop-down fixes and breaks the font rendering on the fly,
when I see this problem.

ProblemType: Bug
DistroRelease: Ubuntu 14.10
Package: xorg 1:7.7+7ubuntu2
ProcVersionSignature: Ubuntu 3.16.0-34.45-generic 3.16.7-ckt8
Uname: Linux 3.16.0-34-generic x86_64
.tmp.unity.support.test.0:

ApportVersion: 2.14.7-0ubuntu8.4
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 Apr 20 06:39:41 2015
DistUpgraded: Fresh install
DistroCodename: utopic
DistroVariant: ubuntu
ExtraDebuggingInterest: Yes, if not too technical
GraphicsCard:
 Intel Corporation Broadwell-U Integrated Graphics [8086:1616] (rev 09) (prog-if 00 [VGA controller])
   Subsystem: Dell Device [1028:0675]
InstallationDate: Installed on 2015-04-05 (14 days ago)
InstallationMedia: Ubuntu 14.10 "Utopic Unicorn" - Release amd64 (20141022.1)
MachineType: Dell Inc. Inspiron 7348
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.16.0-34-generic.efi.signed root=/dev/mapper/LVM_VG1-root ro quiet splash vt.handoff=7
SourcePackage: xorg
Symptom: display
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 11/26/2014
dmi.bios.vendor: Dell Inc.
dmi.bios.version: A01
dmi.board.name: 08FH29
dmi.board.vendor: Dell Inc.
dmi.board.version: A00
dmi.chassis.type: 10
dmi.chassis.vendor: Dell Inc.
dmi.chassis.version: A01
dmi.modalias: dmi:bvnDellInc.:bvrA01:bd11/26/2014:svnDellInc.:pnInspiron7348:pvrA01:rvnDellInc.:rn08FH29:rvrA00:cvnDellInc.:ct10:cvrA01:
dmi.product.name: Inspiron 7348
dmi.product.version: A01
dmi.sys.vendor: Dell Inc.
version.compiz: compiz 1:0.9.12+14.10.20140918-0ubuntu1
version.ia32-libs: ia32-libs N/A
version.libdrm2: libdrm2 2.4.56-1
version.libgl1-mesa-dri: libgl1-mesa-dri 10.3.2-0ubuntu0.1
version.libgl1-mesa-dri-experimental: libgl1-mesa-dri-experimental N/A
version.libgl1-mesa-glx: libgl1-mesa-glx 10.3.2-0ubuntu0.1
version.xserver-xorg-core: xserver-xorg-core 2:1.16.0-1ubuntu1.3
version.xserver-xorg-input-evdev: xserver-xorg-input-evdev 1:2.9.0-1ubuntu2
version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:7.4.0-2ubuntu2
version.xserver-xorg-video-intel: xserver-xorg-video-intel 2:2.99.914-1~exp1ubuntu4.2
version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:1.0.11-1ubuntu2
xserver.bootTime: Mon Apr 20 05:54:03 2015
xserver.configfile: default
xserver.errors:

xserver.logfile: /var/log/Xorg.0.log
xserver.outputs:
 product id                               19528
 vendor                                     SDC
xserver.version: 2:1.16.0-1ubuntu1.3

** Affects: xorg (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug compiz-0.9 corruption ubuntu utopic

** Attachment added: "Screenshot of problem"
   https://bugs.launchpad.net/bugs/1446053/+attachment/4379738/+files/Screenshot%20from%202015-04-20%2006%3A36%3A18.png

** Summary changed:

- Font corruption some characters suddenly not rendered after a period of usage
+ Font corruption some characters suddenly not rendered after login or after a period of usage

** Description changed:

  This has occurred multiple times on my machine (Dell Inspiron 13 7000
  series laptop), it happens without warning. After which time suddenly
  application windows will fail to render certain characters making
  everything unreadable. In the past it has happened immediately after
  login, this time it happened after ~30 minutes usage from a cold boot.
  
  See attached screenshot.
  This doesn't happen for every window, chrome is generally ok, as are the unity launcher. The tools in the system tray and the power off menu are affected, as are nautilus, gedit, and application menus generally.
  Rolling over labels sometimes causes them to rener properly while the mouse is over them.
  
  Terminal is fine
  
  There is a workaround which is to change the font antialiasing settings
  with unity tweak tool, however this isn't a permanent fix - last time it
  was set to RGBA, so I changed it to Grayscale. This time it happened it
  was set to Grayscale and I set it to RGBA and it fixes it.
  
  I don't know enough to know whether this is a video driver issue, or a
  problem with gtk or what, so it's possible you may need to recategorise
  this defect.
  
+ One other thing that may be useful info is that twiddling the
+ antialiasing drop-down fixes and breaks the font rendering on the fly,
+ when I see this problem.
+ 
  ProblemType: Bug
  DistroRelease: Ubuntu 14.10
  Package: xorg 1:7.7+7ubuntu2
  ProcVersionSignature: Ubuntu 3.16.0-34.45-generic 3.16.7-ckt8
  Uname: Linux 3.16.0-34-generic x86_64
  .tmp.unity.support.test.0:
-  
+ 
  ApportVersion: 2.14.7-0ubuntu8.4
  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 Apr 20 06:39:41 2015
  DistUpgraded: Fresh install
  DistroCodename: utopic
  DistroVariant: ubuntu
  ExtraDebuggingInterest: Yes, if not too technical
  GraphicsCard:
-  Intel Corporation Broadwell-U Integrated Graphics [8086:1616] (rev 09) (prog-if 00 [VGA controller])
-    Subsystem: Dell Device [1028:0675]
+  Intel Corporation Broadwell-U Integrated Graphics [8086:1616] (rev 09) (prog-if 00 [VGA controller])
+    Subsystem: Dell Device [1028:0675]
  InstallationDate: Installed on 2015-04-05 (14 days ago)
  InstallationMedia: Ubuntu 14.10 "Utopic Unicorn" - Release amd64 (20141022.1)
  MachineType: Dell Inc. Inspiron 7348
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.16.0-34-generic.efi.signed root=/dev/mapper/LVM_VG1-root ro quiet splash vt.handoff=7
  SourcePackage: xorg
  Symptom: display
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 11/26/2014
  dmi.bios.vendor: Dell Inc.
  dmi.bios.version: A01
  dmi.board.name: 08FH29
  dmi.board.vendor: Dell Inc.
  dmi.board.version: A00
  dmi.chassis.type: 10
  dmi.chassis.vendor: Dell Inc.
  dmi.chassis.version: A01
  dmi.modalias: dmi:bvnDellInc.:bvrA01:bd11/26/2014:svnDellInc.:pnInspiron7348:pvrA01:rvnDellInc.:rn08FH29:rvrA00:cvnDellInc.:ct10:cvrA01:
  dmi.product.name: Inspiron 7348
  dmi.product.version: A01
  dmi.sys.vendor: Dell Inc.
  version.compiz: compiz 1:0.9.12+14.10.20140918-0ubuntu1
  version.ia32-libs: ia32-libs N/A
  version.libdrm2: libdrm2 2.4.56-1
  version.libgl1-mesa-dri: libgl1-mesa-dri 10.3.2-0ubuntu0.1
  version.libgl1-mesa-dri-experimental: libgl1-mesa-dri-experimental N/A
  version.libgl1-mesa-glx: libgl1-mesa-glx 10.3.2-0ubuntu0.1
  version.xserver-xorg-core: xserver-xorg-core 2:1.16.0-1ubuntu1.3
  version.xserver-xorg-input-evdev: xserver-xorg-input-evdev 1:2.9.0-1ubuntu2
  version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:7.4.0-2ubuntu2
  version.xserver-xorg-video-intel: xserver-xorg-video-intel 2:2.99.914-1~exp1ubuntu4.2
  version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:1.0.11-1ubuntu2
  xserver.bootTime: Mon Apr 20 05:54:03 2015
  xserver.configfile: default
  xserver.errors:
-  
+ 
  xserver.logfile: /var/log/Xorg.0.log
  xserver.outputs:
-  product id                               19528 
-  vendor                                     SDC
+  product id                               19528
+  vendor                                     SDC
  xserver.version: 2:1.16.0-1ubuntu1.3

-- 
You received this bug notification because you are a member of Ubuntu
Touch seeded packages, which is subscribed to xorg in Ubuntu.
https://bugs.launchpad.net/bugs/1446053

Title:
  Font corruption some characters suddenly not rendered after login or
  after a period of usage

Status in xorg package in Ubuntu:
  New

Bug description:
  This has occurred multiple times on my machine (Dell Inspiron 13 7000
  series laptop), it happens without warning. After which time suddenly
  application windows will fail to render certain characters making
  everything unreadable. In the past it has happened immediately after
  login, this time it happened after ~30 minutes usage from a cold boot.

  See attached screenshot.
  This doesn't happen for every window, chrome is generally ok, as are the unity launcher. The tools in the system tray and the power off menu are affected, as are nautilus, gedit, and application menus generally.
  Rolling over labels sometimes causes them to rener properly while the mouse is over them.

  Terminal is fine

  There is a workaround which is to change the font antialiasing
  settings with unity tweak tool, however this isn't a permanent fix -
  last time it was set to RGBA, so I changed it to Grayscale. This time
  it happened it was set to Grayscale and I set it to RGBA and it fixes
  it.

  I don't know enough to know whether this is a video driver issue, or a
  problem with gtk or what, so it's possible you may need to
  recategorise this defect.

  One other thing that may be useful info is that twiddling the
  antialiasing drop-down fixes and breaks the font rendering on the fly,
  when I see this problem.

  ProblemType: Bug
  DistroRelease: Ubuntu 14.10
  Package: xorg 1:7.7+7ubuntu2
  ProcVersionSignature: Ubuntu 3.16.0-34.45-generic 3.16.7-ckt8
  Uname: Linux 3.16.0-34-generic x86_64
  .tmp.unity.support.test.0:

  ApportVersion: 2.14.7-0ubuntu8.4
  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 Apr 20 06:39:41 2015
  DistUpgraded: Fresh install
  DistroCodename: utopic
  DistroVariant: ubuntu
  ExtraDebuggingInterest: Yes, if not too technical
  GraphicsCard:
   Intel Corporation Broadwell-U Integrated Graphics [8086:1616] (rev 09) (prog-if 00 [VGA controller])
     Subsystem: Dell Device [1028:0675]
  InstallationDate: Installed on 2015-04-05 (14 days ago)
  InstallationMedia: Ubuntu 14.10 "Utopic Unicorn" - Release amd64 (20141022.1)
  MachineType: Dell Inc. Inspiron 7348
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.16.0-34-generic.efi.signed root=/dev/mapper/LVM_VG1-root ro quiet splash vt.handoff=7
  SourcePackage: xorg
  Symptom: display
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 11/26/2014
  dmi.bios.vendor: Dell Inc.
  dmi.bios.version: A01
  dmi.board.name: 08FH29
  dmi.board.vendor: Dell Inc.
  dmi.board.version: A00
  dmi.chassis.type: 10
  dmi.chassis.vendor: Dell Inc.
  dmi.chassis.version: A01
  dmi.modalias: dmi:bvnDellInc.:bvrA01:bd11/26/2014:svnDellInc.:pnInspiron7348:pvrA01:rvnDellInc.:rn08FH29:rvrA00:cvnDellInc.:ct10:cvrA01:
  dmi.product.name: Inspiron 7348
  dmi.product.version: A01
  dmi.sys.vendor: Dell Inc.
  version.compiz: compiz 1:0.9.12+14.10.20140918-0ubuntu1
  version.ia32-libs: ia32-libs N/A
  version.libdrm2: libdrm2 2.4.56-1
  version.libgl1-mesa-dri: libgl1-mesa-dri 10.3.2-0ubuntu0.1
  version.libgl1-mesa-dri-experimental: libgl1-mesa-dri-experimental N/A
  version.libgl1-mesa-glx: libgl1-mesa-glx 10.3.2-0ubuntu0.1
  version.xserver-xorg-core: xserver-xorg-core 2:1.16.0-1ubuntu1.3
  version.xserver-xorg-input-evdev: xserver-xorg-input-evdev 1:2.9.0-1ubuntu2
  version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:7.4.0-2ubuntu2
  version.xserver-xorg-video-intel: xserver-xorg-video-intel 2:2.99.914-1~exp1ubuntu4.2
  version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:1.0.11-1ubuntu2
  xserver.bootTime: Mon Apr 20 05:54:03 2015
  xserver.configfile: default
  xserver.errors:

  xserver.logfile: /var/log/Xorg.0.log
  xserver.outputs:
   product id                               19528
   vendor                                     SDC
  xserver.version: 2:1.16.0-1ubuntu1.3

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