Comment 56 for bug 291467

@macabro22: you can put your ~/.xsession-errors file

@all:
- the problem is that compiz doesn't register itself to gnome-session and thus gnome-session wait until timeout (10 seconds) => error "WARNING: Application 'gnome-wm.desktop' failed to register before timeout"
- the *workaround* that seems to works for more of us is to disable gnome-wm.destop and start compiz with an other launcher.
  - in fact there is no more window manager => error "WARNING: Unable to find provider 'gnome-wm' of required component 'windowmanager'"
  - ways to disable the windowmanager phase : uncheck it in gnome-session-properties OR comment line X-GNOME-Autostart-Phase in gnome-wm.desktop (in fact that, compiz will start as a normal application)

For those who still have the delay issue.
- Be sure that you don't have any windowmanager in the windowmanager phase : you shouldn't have and timeout error related to it in your ~/.xsession-errors file.
- Look at other possible errors in your ~/.xsession-errors file.

Explanation about the bug :
- look at comment 27 (https://bugs.launchpad.net/ubuntu/+source/compiz/+bug/291467/comments/27)
- the explanation about the timeout : http://live.gnome.org/SessionManagement/GnomeSession#head-fea2c0aa8dc1b74e5a42a644a402f008c43bdf03