** Description changed:
- This bug will cause static grey or black screen instead of openning
+ == 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
-
- 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)
** Changed in: gnome-session (Ubuntu Utopic)
Status: Triaged => In Progress
** Changed in: gnome-session (Ubuntu Trusty)
Status: Triaged => In Progress
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https://bugs.launchpad.net/bugs/1251281
Title:
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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