[Bug 1251281] [NEW] gnome-session-flashback/Unity fails to start without hardware acceleration in cloud/remote environments (Forwarded-X/XRDP/VNC/NX/X2GO/Chromoting)

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This bug will cause static grey or black screen instead of openning
remote session using Forwarded-X/XRDP/VNC/NX/X2GO/Chromoting from
x2goclient, rdpclient(reminna/vinagre/mstsc), SSH, VNC, NOMACHINE and
etc.

1) lsb_release -rd
Description:	Ubuntu 14.04 LTS
Release:	14.04

2) apt-cache policy gnome-session
gnome-session:
  Installed: 3.9.90-0ubuntu12
  Candidate: 3.9.90-0ubuntu12
  Version table:
 *** 3.9.90-0ubuntu12 0
        500 http://us.archive.ubuntu.com/ubuntu/ trusty/main amd64 Packages
        100 /var/lib/dpkg/status

apt-cache policy gnome-session-fallback
gnome-session-fallback:
  Installed: 1:3.8.0-1ubuntu12.1
  Candidate: 1:3.8.0-1ubuntu12.1
  Version table:
 *** 1:3.8.0-1ubuntu12.1 0
        500 http://us.archive.ubuntu.com/ubuntu/ trusty-updates/universe amd64 Packages
        100 /var/lib/dpkg/status
     1:3.8.0-1ubuntu11 0
        500 http://us.archive.ubuntu.com/ubuntu/ trusty/universe amd64 Packages

apt-cache policy xrdp
xrdp:
  Installed: 0.6.0-1
  Candidate: 0.6.0-1
  Version table:
 *** 0.6.0-1 0
        500 http://us.archive.ubuntu.com/ubuntu/ trusty/universe amd64 Packages
        100 /var/lib/dpkg/status

apt-cache policy remmina
remmina:
  Installed: 1.0.0-4ubuntu3
  Candidate: 1.0.0-4ubuntu3
  Version table:
 *** 1.0.0-4ubuntu3 0
        500 http://us.archive.ubuntu.com/ubuntu/ trusty/main amd64 Packages
        100 /var/lib/dpkg/status

apt-cache policy vinagre
vinagre:
  Installed: 3.10.2-0ubuntu1
  Candidate: 3.10.2-0ubuntu1
  Version table:
 *** 3.10.2-0ubuntu1 0
        500 http://us.archive.ubuntu.com/ubuntu/ trusty/universe amd64 Packages
        100 /var/lib/dpkg/status

3) What is expected to happen is when one installs xrdp on the host and
attempts to use remmina or vinagre on a Ubuntu 14.04 client to RDP in,
it works.

4) What happens instead is it shows a gray static screen as per attached screenshot. This would appear an issue with gnome-session as per client log:
cat .xsession-errors.old
Script for ibus started at run_im.
Script for auto started at run_im.
Script for default started at run_im.
init: indicator-application main process ended, respawning
init: indicator-application main process ended, respawning
init: indicator-application respawning too fast, stopped
Xsession: X session started for  at Sun Jul 20 15:25:59 CDT 2014
X Error of failed request:  BadValue (integer parameter out of range for operation)
  Major opcode of failed request:  109 (X_ChangeHosts)
  Value in failed request:  0x5
  Serial number of failed request:  6
  Current serial number in output stream:  8
localuser:moniker being added to access control list
X Error of failed request:  BadValue (integer parameter out of range for operation)
  Major opcode of failed request:  109 (X_ChangeHosts)
  Value in failed request:  0x5
  Serial number of failed request:  6
  Current serial number in output stream:  8
Script for ibus started at run_im.
Script for auto started at run_im.
Script for default started at run_im.
Script for ibus started at run_im.
Script for auto started at run_im.
Script for default started at run_im.
gnome-session-is-accelerated: No composite extension.
gnome-session-check-accelerated: Helper exited with code 256
gnome-session-is-accelerated: No composite extension.
gnome-session-check-accelerated: Helper exited with code 256

** (process:2565): WARNING **: software acceleration check failed: Child
process exited with code 1

** (x-session-manager:2565): CRITICAL **: We failed, but the fail whale
is dead. Sorry....

The following is not a WORKAROUND, create /etc/xorg.conf :
Section "Device"
   Identifier  "Intel Graphics"
   Driver      "Intel"
   Option      "DRI" "False"
EndSection

ProblemType: Bug
DistroRelease: Ubuntu 14.04
Package: gnome-session 3.9.90-0ubuntu12
ProcVersionSignature: Ubuntu 3.13.0-32.57-generic 3.13.11.4
Uname: Linux 3.13.0-32-generic x86_64
ApportVersion: 2.14.1-0ubuntu3.2
Architecture: amd64
CurrentDesktop: Unity
Date: Sun Jul 20 15:35:23 2014
InstallationDate: Installed on 2014-06-22 (28 days ago)
InstallationMedia: Ubuntu 14.04 LTS "Trusty Tahr" - Release amd64 (20140417)
PackageArchitecture: all
SourcePackage: gnome-session
UpgradeStatus: No upgrade log present (probably fresh install)

** Affects: gnome-session
     Importance: Medium
         Status: Fix Released

** Affects: gnome-session (Ubuntu)
     Importance: Critical
         Status: Triaged


** Tags: cherry-pick patch regression-release trusty utopic vivid
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gnome-session-flashback/Unity fails to start without hardware acceleration in cloud/remote environments (Forwarded-X/XRDP/VNC/NX/X2GO/Chromoting)
https://bugs.launchpad.net/bugs/1251281
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