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[Rüdiger Kupper <ruediger.kupper+launchpad@xxxxxxxxx>]

Thanks, folks, for getting this into action. Meanwhile, here's a problem
related to Eugene's backport:

Eugene provides a backport of gnome-session 3.12, but this package has a bug: the "gnome-session-quit" command is broken. This prevents that users from logging out of the session. The problem is described here: 
https://bbs.archlinux.org/viewtopic.php?pid=1344528#p1344528 (see comment 4: the logout dialog was removed with gnome-session 3.12).
So Eugenes fix currently introduces another bug. Looks we need to choose: Have acceleration but no logout, or the other way round :-(

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https://bugs.launchpad.net/bugs/1251281

Title:
  gnome-flashback (metacity) fails to start without hardware
  acceleration, cloud/remote environments
  (Forwarded-X/XRDP/VNC/NX/X2GO/Chromoting)

Status in “gnome-session” package in Ubuntu:
  In Progress

Bug description:
  When trying to launch gnome-flashback (metacity) session from
  XRDP/VNC/NX/X2GO/Chromoting it fails with diagnostics in log:

  >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:11622): WARNING **: software acceleration check failed: Child process exited with code 1

  When starting manually gnome-panel, metacity, nautilus and other
  components from .xsession - it works normally.

  Looks like - unnecessary check performed (and failed).

  This breaks gnome-flashback, breaking upgrade path from previous LTS
  and removing most sane option for cloud environments!

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