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[Christopher Townsend <christopher.townsend@xxxxxxxxxxxxx>]

Ok, well, it is trying to use llvmpipe.  A fairly recent change in Nux
handles this now (http://bazaar.launchpad.net/~unity-
team/nux/trunk/revision/810#debian/50_check_unity_support).

Looking at the gnome-session.log, the failure is occurring when the open plugin is asking if the X session supports OpenGL/GLX and it is returning false which causes the opengl plugin to fatally error out.  From the opengl plugin:
    glXGetConfig (dpy, visinfo, GLX_USE_GL, &value);
    if (!value)
    {
        compLogMessage ("opengl", CompLogLevelFatal,
                        "Root visual is not a GL visual");
        XFree (visinfo);
        screen->handleCompizEvent ("opengl", "fatal_fallback", o);
        setFailed ();
        return;
    }

I suspect something in llvmpipe is misbehaving, but what it could be is
beyond my knowledge.

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https://bugs.launchpad.net/bugs/1212821

Title:
  Unity fails to load on old hardware on Saucy

Status in “unity” package in Ubuntu:
  Confirmed

Bug description:
  On logging in I see just the wallpaper with no top panel and no launcher.
  Note that this is not bug #1066764 (Unity fails to load on old hardware (compiz enabling LLVMpipe has no effect and Mesa tries to use hardware still)) as compiz is at 1:0.9.9~daily13.04.18.1~13.04-0ubuntu4 and the errors for that bug are not seen in .xsessionerrors.

  .xsessionerrors only contains
  Script for cjkv started at run_im.
  Script for default started at run_im.

  The graphics is an intel 865 chipset.

  Xorg.0.log attached

  ProblemType: Bug
  DistroRelease: Ubuntu 13.10
  Package: unity 7.1.0+13.10.20130813.1-0ubuntu1
  ProcVersionSignature: Ubuntu 3.11.0-2.5-generic 3.11.0-rc5
  Uname: Linux 3.11.0-2-generic i686
  ApportVersion: 2.12-0ubuntu3
  Architecture: i386
  CompizPlugins: No value set for `/apps/compiz-1/general/screen0/options/active_plugins'
  Date: Thu Aug 15 20:41:24 2013
  InstallationDate: Installed on 2013-08-15 (0 days ago)
  InstallationMedia: Ubuntu 13.10 "Saucy Salamander" - Alpha i386 (20130815)
  MarkForUpload: True
  SourcePackage: unity
  UpgradeStatus: No upgrade log present (probably fresh install)

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