Fallback from Unity-GL should use unity-2d if installed

[Mark Shuttleworth]

Binary package hint: gnome-session

When logging into a Unity-GL session, we detect whether the hardware is capable of supporting that shell, and if it is not, we fall back to a 2D experience. In Natty, that 2D experience is the Classic Gnome shell. However, if the Unity-2D shell is installed, then we should fall back to that instead.

How to reproduce:

 - install Natty on a machine that is not capable of running Unity-GL
 - install Unity-2D
 - log into the desktop choosing the standard "Ubuntu Desktop" session

What happens:

 - you get a warning, and the Classic Gnome session

What should happen:

 - you should not get a warning, and the Unity-2D session should be loaded

[Sebastien Bacher (seb128)]

Right, we dsicussed that with Didier last week as well

[Didier Roche-Tolomelli (didrocks)]

Yeah, nice that we are on the same page as I proposed that last week :)

So, the fallback session should have a preference order rather than using alternatives in that case and an option extra key to tell "don't show the fallback message if fallbacking to…".
Working on it this week.

[Mark Shuttleworth (sabdfl)]

Brilliant, thanks Didrocks :-)

[Launchpad Janitor (janitor)]

This bug was fixed in the package gnome-session - 2.32.1-0ubuntu12

---------------
gnome-session (2.32.1-0ubuntu12) natty; urgency=low

  * debian/patches/05_show_message_if_fallback.patch =>
    debian/patches/05_enhance_fallback_mode.patch:
    - now support multiple fallbacks. It will pick the first valid one.
      show the corresponding fallback message if needed.
  * debian/patches/02_add_ubuntu_session.patch: (LP: #703653)
    - the ubuntu session has now two fallbacks:
      + unity-2d (2d-ubuntu) for launching the 2d version of unity without any
        warning message if present.
      + gnome-classic (classic-gnome), launching the classic gnome shell
        (panels) with a warning message about the different user experience.
 -- Didier Roche <email address hidden> Tue, 18 Jan 2011 12:58:24 +0100

[PEIGNOT Kévin (kpeignot)]

I think it should show a message, even if fallbacking to Unity-QT, and in the two cases ( fallback to Gnome-panel or Unity-QT, ask the suer if he wants to show this message next time.)