Bug Description

== Impact ==

It was impossible to launch a gnome-session-based desktop on a system where hardware accelerations is not available (such as old hardware, or when using a remote desktop).

That looks like a quite popular use case — more than a hundred of people marked this bug as affecting them.

== Test Case ==

The original bug description below contains a test case.

== Proposed Fix ==

The fix backports an upstream commit which adds --disable- acceleration- check commandline option, and makes Upstart user session pass that flag to gnome-session when the session is gnome-fallback (aka gnome-flashback -metacity) . Of course, that option can be used with other sessions as well.

This was fixed in vivid in version 3.14.0-2ubuntu4.

== Regression Potential ==

The option was accepted upstream, and nobody complained so far. So the regression potential should be low.

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

== Original Description ==

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

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-accelerat ed: Helper exited with code 256

gnome-session- is-accelerated: No composite extension.

gnome-session- check-accelerat ed: 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

ProcVersionSign ature: 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)

PackageArchitec ture: all

SourcePackage: gnome-session

UpgradeStatus: No upgrade log present (probably fresh install)