and a bit more verbose ...

ogra@panda:~$ DISPLAY=:0.0 unity --replace
compiz (core) - Info: Loading plugin: core
compiz (core) - Info: Starting plugin: core
unity-panel-service: Kein Prozess gefunden
compiz (core) - Info: Loading plugin: ccp
compiz (core) - Info: Starting plugin: ccp
compizconfig - Info: Backend     : gsettings
compizconfig - Info: Integration : true
compizconfig - Info: Profile     : unity
compiz (core) - Info: Loading plugin: composite
compiz (core) - Info: Starting plugin: composite
compiz (core) - Info: Loading plugin: opengl
compiz (core) - Info: Starting plugin: opengl
PVR:(Warning): PVRSRVOpenDCDevice: Warning - 138 returned [80, /bridged_pvr_dc_glue.c]
compiz (core) - Info: Loading plugin: compiztoolbox
compiz (core) - Info: Starting plugin: compiztoolbox
compiz (core) - Info: Loading plugin: decor
compiz (core) - Info: Starting plugin: decor
compiz (core) - Info: Loading plugin: vpswitch
compiz (core) - Info: Starting plugin: vpswitch
compiz (core) - Info: Loading plugin: snap
compiz (core) - Info: Starting plugin: snap
compiz (core) - Info: Loading plugin: mousepoll
compiz (core) - Info: Starting plugin: mousepoll
compiz (core) - Info: Loading plugin: resize
compiz (core) - Info: Starting plugin: resize
compiz (core) - Info: Loading plugin: place
compiz (core) - Info: Starting plugin: place
compiz (core) - Info: Loading plugin: move
compiz (core) - Info: Starting plugin: move
compiz (core) - Info: Loading plugin: wall
compiz (core) - Info: Starting plugin: wall
compiz (core) - Info: Loading plugin: grid
compiz (core) - Info: Starting plugin: grid
compiz (core) - Info: Loading plugin: regex
compiz (core) - Info: Starting plugin: regex
compiz (core) - Info: Loading plugin: imgpng
compiz (core) - Info: Starting plugin: imgpng
compiz (core) - Info: Loading plugin: session
compiz (core) - Info: Starting plugin: session
compiz (core) - Info: Loading plugin: gnomecompat
compiz (core) - Info: Starting plugin: gnomecompat
compiz (core) - Info: Loading plugin: animation
compiz (core) - Info: Starting plugin: animation
compiz (core) - Info: Loading plugin: fade
compiz (core) - Info: Starting plugin: fade
compiz (core) - Info: Loading plugin: unitymtgrabhandles
compiz (core) - Info: Starting plugin: unitymtgrabhandles
compiz (core) - Info: Loading plugin: workarounds
compiz (core) - Info: Starting plugin: workarounds
compiz (core) - Info: Loading plugin: scale
compiz (core) - Info: Starting plugin: scale
compiz (core) - Info: Loading plugin: expo
compiz (core) - Info: Starting plugin: expo
compiz (core) - Info: Loading plugin: ezoom
compiz (core) - Info: Starting plugin: ezoom
compiz (core) - Info: Loading plugin: unityshell
compiz (core) - Info: Starting plugin: unityshell
Fontconfig warning: "/etc/fonts/conf.d/69-language-selector-ja-jp.conf", line 141: Having multiple values in <test> isn't supported and may not works as expected
Fontconfig warning: "/etc/fonts/conf.d/69-language-selector-zh-tw.conf", line 79: Having multiple values in <test> isn't supported and may not works as expected
Fontconfig warning: "/etc/fonts/conf.d/90-fonts-nanum.conf", line 9: Having multiple values in <test> isn't supported and may not works as expected
Fontconfig warning: "/etc/fonts/conf.d/90-fonts-nanum.conf", line 22: Having multiple <family> in <alias> isn't supported and may not works as expected
Fontconfig warning: "/etc/fonts/conf.d/90-fonts-nanum.conf", line 22: Having multiple <family> in <alias> isn't supported and may not works as expected
Fontconfig warning: "/etc/fonts/conf.d/90-fonts-nanum.conf", line 22: Having multiple <family> in <alias> isn't supported and may not works as expected
Fontconfig warning: "/etc/fonts/conf.d/90-fonts-nanum.conf", line 26: Having multiple <family> in <alias> isn't supported and may not works as expected
Fontconfig warning: "/etc/fonts/conf.d/90-fonts-nanum.conf", line 31: Having multiple values in <test> isn't supported and may not works as expected
Fontconfig warning: "/etc/fonts/conf.d/90-fonts-nanum.conf", line 40: Having multiple values in <test> isn't supported and may not works as expected
WARN  2012-09-01 15:53:49 unity.favorites FavoriteStoreGSettings.cpp:99 Unable to load GDesktopAppInfo for 'ubiquity-gtkui.desktop'
WARN  2012-09-01 15:53:49 unity.favorites FavoriteStoreGSettings.cpp:99 Unable to load GDesktopAppInfo for 'libreoffice-writer.desktop'
WARN  2012-09-01 15:53:49 unity.favorites FavoriteStoreGSettings.cpp:99 Unable to load GDesktopAppInfo for 'libreoffice-calc.desktop'
WARN  2012-09-01 15:53:49 unity.favorites FavoriteStoreGSettings.cpp:99 Unable to load GDesktopAppInfo for 'libreoffice-impress.desktop'
ERROR 2012-09-01 15:53:49 unity.thumbnailgenerator ThumbnailGenerator.cpp:429 More than one thumbnail generator created.
compiz (unityshell) - Error: OpenGL 1.4+ not supported

compiz (unityshell) - Error: GL_ARB_vertex_program not supported

compiz (unityshell) - Error: GL_ARB_fragment_program not supported

compiz (unityshell) - Error: GL_ARB_vertex_buffer_object not supported

compiz (unityshell) - Error: GL_ARB_framebuffer_object or GL_EXT_framebuffer_object not supported

compiz (unityshell) - Error: GL_ARB_texture_non_power_of_two or GL_ARB_texture_rectangle not supported

compiz (core) - Error: Plugin initScreen failed: unityshell
compiz (core) - Error: Failed to start plugin: unityshell
compiz (core) - Info: Unloading plugin: unityshell
X Error of failed request:  BadWindow (invalid Window parameter)
  Major opcode of failed request:  3 (X_GetWindowAttributes)
  Resource id in failed request:  0x1c00454
  Serial number of failed request:  8489
  Current serial number in output stream:  8490
ogra@panda:~$