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[The Great Gazauga <eanbowman@xxxxxxxxx>]

Solution in #8 worked for me as well. Upgraded to 15.10 and had the
garbled screen. The config file fixed it.

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https://bugs.launchpad.net/bugs/1507255

Title:
  Garbled graphics in Wily with Intel GMA4500 chip

Status in xserver-xorg-video-intel package in Ubuntu:
  Confirmed

Bug description:
  This affects both Ubuntu GNOME and Ubuntu Wily 20151017.1. The
  graphics are so badly garbled I can only file this bug on an
  unaffected OS where I've held back the update on just that one package
  to about Beta 1 status:

  lance@lance-INTEL-desktop:~$ apt-cache policy xserver-xorg-video-intel
  xserver-xorg-video-intel:
    Installed: 2:2.99.917-1ubuntu1
    Candidate: 2:2.99.917+git20150808-0ubuntu4
    Version table:
       2:2.99.917+git20150808-0ubuntu4 0
          500 http://us.archive.ubuntu.com/ubuntu/ wily/main i386 Packages
   *** 2:2.99.917-1ubuntu1 0
          100 /var/lib/dpkg/status

  I'll attach a picture of the garbled screen with the updated xserver-
  xorg-video-intel package. Oddly a screenshot taken from the affected
  OS displays perfectly OK in the unaffected OS so I used my camera.

  The info provided by lspci may not be very helpful:

  lance@lance-INTEL-desktop:~$ lspci -v -s `lspci | awk '/VGA/{print $1}'`
  00:02.0 VGA compatible controller: Intel Corporation 4 Series Chipset Integrated Graphics Controller (rev 03) (prog-if 00 [VGA controller])
   Subsystem: Intel Corporation Device 0025
   Flags: bus master, fast devsel, latency 0, IRQ 27
   Memory at d0000000 (64-bit, non-prefetchable) [size=4M]
   Memory at c0000000 (64-bit, prefetchable) [size=256M]
   I/O ports at f1c0 [size=8]
   Expansion ROM at <unassigned> [disabled]
   Capabilities: <access denied>
   Kernel driver in use: i915

  The tech specs show:

  Internal Graphics:
  • Intel ® GMA4500 onboard graphics subsystem with support for:
  ― Analog displays (VGA)
  ― Digital displays (DVI-D)

  I'm just using VGA ATM.

  Something else worth mentioning is this warning displayed while filing
  the bug report:

  Your system is providing 3D via software rendering rather than
  hardware rendering.  This is a compatibility mode which should display
  3D graphics properly but the performance may be very poor.  If the
  problem you're reporting is related to graphics performance, your real
  question may be why X didn't use hardware acceleration for your
  system.

  I did try booting an earlier kernel to no avail, but holding back just
  this one update prevents the borkage.

  ProblemType: Bug
  DistroRelease: Ubuntu 15.10
  Package: xserver-xorg-video-intel 2:2.99.917-1ubuntu1
  ProcVersionSignature: Ubuntu 4.2.0-16.19-generic 4.2.3
  Uname: Linux 4.2.0-16-generic i686
  ApportVersion: 2.19.1-0ubuntu2
  Architecture: i386
  CompizPlugins: No value set for `/apps/compiz-1/general/screen0/options/active_plugins'
  CompositorRunning: None
  CurrentDesktop: GNOME
  Date: Sun Oct 18 00:17:35 2015
  DistUpgraded: Fresh install
  DistroCodename: wily
  DistroVariant: ubuntu
  ExtraDebuggingInterest: Yes, if not too technical
  GraphicsCard:
   Intel Corporation 4 Series Chipset Integrated Graphics Controller [8086:2e42] (rev 03) (prog-if 00 [VGA controller])
     Subsystem: Intel Corporation Device [8086:0025]
     Subsystem: Intel Corporation Device [8086:0025]
  InstallationDate: Installed on 2015-08-26 (52 days ago)
  InstallationMedia: Ubuntu-GNOME 15.10 "Wily Werewolf" - Alpha i386 (20150826.1)
  ProcEnviron:
   TERM=xterm-256color
   PATH=(custom, no user)
   XDG_RUNTIME_DIR=<set>
   LANG=en_US.UTF-8
   SHELL=/bin/bash
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.2.0-16-generic root=UUID=39597a1e-90b6-4e81-ae29-4c01d28f7f17 ro quiet splash vt.handoff=7
  Renderer: Software
  SourcePackage: xserver-xorg-video-intel
  UdevLog: Error: [Errno 2] No such file or directory: '/var/log/udev'
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 12/23/2010
  dmi.bios.vendor: Intel Corp.
  dmi.bios.version: LDB4310H.86A.0037.2010.1223.1121
  dmi.board.asset.tag: To be filled by O.E.M.
  dmi.board.name: DB43LD
  dmi.board.vendor: Intel Corporation
  dmi.board.version: AAE60577-202
  dmi.chassis.type: 3
  dmi.modalias: dmi:bvnIntelCorp.:bvrLDB4310H.86A.0037.2010.1223.1121:bd12/23/2010:svn:pn:pvr:rvnIntelCorporation:rnDB43LD:rvrAAE60577-202:cvn:ct3:cvr:
  version.compiz: compiz 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 2:2.99.917-1ubuntu1
  version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:1.0.11-1ubuntu3
  xserver.bootTime: Sat Oct 17 23:58:59 2015
  xserver.configfile: default
  xserver.errors:
   AIGLX error: Calling driver entry point failed
   AIGLX: reverting to software rendering
  xserver.logfile: /var/log/Xorg.0.log
  xserver.outputs:

  xserver.version: 2:1.17.2-1ubuntu9

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