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[Pavak Paul <pavakatubuntu@xxxxxxxxx>]

I've identified the kernel from where the issue first occured.
Last kernel without this issue: 4.0.9-040009-generic (http://kernel.ubuntu.com/~kernel-ppa/mainline/v4.0.9-wily/)
First kernel with this issue: 4.1.0-040100rc1-generic (http://kernel.ubuntu.com/~kernel-ppa/mainline/v4.1-rc1-vivid/)
I didn't find any other kernels between these two in (http://kernel.ubuntu.com/~kernel-ppa/mainline/?C=N;O=D)

I didn't understand the whole about bisecting kernel. So please tell me
what to do next.

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https://bugs.launchpad.net/bugs/1516263

Title:
  Texts are not rendering properly

Status in linux package in Ubuntu:
  Incomplete

Bug description:
  In a Ubuntu 16.04 Live session some letters are not showing at all,
  some very white or bold. Sometimes hovering on them shows the original
  text, sometimes blinking.

  WORKAROUND: Install the nvidia proprietary drivers.

  ProblemType: Bug
  DistroRelease: Ubuntu 15.10
  Package: xorg 1:7.7+7ubuntu4
  ProcVersionSignature: Ubuntu 4.2.0-16.19-generic 4.2.3
  Uname: Linux 4.2.0-16-generic x86_64
  .tmp.unity.support.test.0:

  ApportVersion: 2.19.1-0ubuntu3
  Architecture: amd64
  CasperVersion: 1.365
  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: Sat Nov 14 16:16:18 2015
  DistUpgraded: Fresh install
  DistroCodename: wily
  DistroVariant: ubuntu
  ExtraDebuggingInterest: Yes
  GraphicsCard:
   NVIDIA Corporation GM107 [GeForce GTX 750] [10de:1381] (rev a2) (prog-if 00 [VGA controller])
     Subsystem: ASUSTeK Computer Inc. Device [1043:84ad]
  LiveMediaBuild: Ubuntu 15.10 "Wily Werewolf" - Release amd64 (20151021)
  MachineType: To be filled by O.E.M. To be filled by O.E.M.
  ProcEnviron:
   TERM=xterm-256color
   PATH=(custom, no user)
   XDG_RUNTIME_DIR=<set>
   LANG=en_US.UTF-8
   SHELL=/bin/bash
  ProcKernelCmdLine: BOOT_IMAGE=/casper/vmlinuz.efi file=/cdrom/preseed/username.seed boot=casper quiet splash ---
  Renderer: Software
  SourcePackage: xorg
  UdevLog: Error: [Errno 2] No such file or directory: '/var/log/udev'
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 04/07/2014
  dmi.bios.vendor: American Megatrends Inc.
  dmi.bios.version: 2501
  dmi.board.asset.tag: To be filled by O.E.M.
  dmi.board.name: M5A99FX PRO R2.0
  dmi.board.vendor: ASUSTeK COMPUTER INC.
  dmi.board.version: Rev 1.xx
  dmi.chassis.asset.tag: To Be Filled By O.E.M.
  dmi.chassis.type: 3
  dmi.chassis.vendor: To Be Filled By O.E.M.
  dmi.chassis.version: To Be Filled By O.E.M.
  dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvr2501:bd04/07/2014:svnTobefilledbyO.E.M.:pnTobefilledbyO.E.M.:pvrTobefilledbyO.E.M.:rvnASUSTeKCOMPUTERINC.:rnM5A99FXPROR2.0:rvrRev1.xx:cvnToBeFilledByO.E.M.:ct3:cvrToBeFilledByO.E.M.:
  dmi.product.name: To be filled by O.E.M.
  dmi.product.version: To be filled by O.E.M.
  dmi.sys.vendor: To be filled by O.E.M.
  version.compiz: compiz 1:0.9.12.2+15.10.20151015-0ubuntu1
  version.ia32-libs: ia32-libs N/A
  version.libdrm2: libdrm2 2.4.64-1
  version.libgl1-mesa-dri: libgl1-mesa-dri 11.0.2-1ubuntu4
  version.libgl1-mesa-dri-experimental: libgl1-mesa-dri-experimental N/A
  version.libgl1-mesa-glx: libgl1-mesa-glx 11.0.2-1ubuntu4
  version.xserver-xorg-core: xserver-xorg-core 2:1.17.2-1ubuntu9
  version.xserver-xorg-input-evdev: xserver-xorg-input-evdev 1:2.9.2-1ubuntu1
  version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:7.5.0+git20150819-0ubuntu1
  version.xserver-xorg-video-intel: xserver-xorg-video-intel 2:2.99.917+git20150808-0ubuntu4
  version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:1.0.11-1ubuntu3
  xserver.bootTime: Sat Nov 14 20:58:08 2015
  xserver.configfile: default
  xserver.errors:
   Failed to load module "nvidia" (module does not exist, 0)
   Failed to load module "nvidia" (module does not exist, 0)
   AIGLX: reverting to software rendering
  xserver.logfile: /var/log/Xorg.0.log
  xserver.version: 2:1.17.2-1ubuntu9
  xserver.video_driver: nouveau

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