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I just upgraded to 14.04, and I knew ahead of time that I was going to have X issues, but I did it anyway.

I have 4 screens attached to an nVidia Quadro NVS 450, using the proprietary nVidia driver (version 331.38 says nvidia-settings). Using nvidia-settings, I was able to enable Xinerama, and configure all 4 screens. Then I reboot, and the login screen looks great, all 4 screens work. Then when I get to my desktop, I get 4 purple screens. I can move my pointer between them as expected. However the "UI" doesn't show up. No sidebar, no menubar at the top. Nothing. I can ssh into the machine, and start up Chrome (that's what I'm typing on now), and I can move the window between screens as expected. However, if I open a terminal and type "unity", I get this:

stop: Unknown job: unity-panel-service
start: Unknown job: unity-panel-service
compiz (core) - Info: Loading plugin: core
compiz (core) - Info: Starting plugin: core
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) - Fatal: No composite extension
compiz (core) - Error: Plugin initScreen failed: composite
compiz (core) - Error: Failed to start plugin: composite
compiz (core) - Info: Unloading plugin: composite
compiz (core) - Info: Loading plugin: opengl
compiz (core) - Info: Unity is not supported by your hardware. Enabling software rendering instead (slow).
compiz (core) - Info: Starting plugin: opengl
compiz (core) - Error: Plugin 'composite' not loaded.

compiz (core) - Error: Plugin init failed: opengl
compiz (core) - Error: Failed to start plugin: opengl
compiz (core) - Info: Unloading plugin: opengl
compiz (core) - Info: Loading plugin: vpswitch
compiz (core) - Info: Starting plugin: vpswitch
compiz (core) - Info: Loading plugin: regex
compiz (core) - Info: Starting plugin: regex
compiz (core) - Info: Loading plugin: grid
compiz (core) - Info: Starting plugin: grid
compiz (core) - Error: Plugin 'composite' not loaded.

compiz (core) - Error: Plugin init failed: grid
compiz (core) - Error: Failed to start plugin: grid
compiz (core) - Info: Unloading plugin: grid
compiz (core) - Info: Loading plugin: wall
compiz (core) - Info: Starting plugin: wall
compiz (core) - Error: Plugin 'composite' not loaded.
compiz (core) - Error: Plugin init failed: wall
compiz (core) - Error: Failed to start plugin: wall
compiz (core) - Info: Unloading plugin: wall
compiz (core) - Info: Loading plugin: resize
compiz (core) - Info: Starting plugin: resize
compiz (core) - Fatal: No composite extension
compiz (core) - Fatal: No composite extension
Segmentation fault (core dumped)

Any way I might be able to get this to work? I think I had Xinerama working on 12.04 (I don't remember how I had it configured, but I did have 4 working screens).

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closed as off-topic by Jorge Castro, Florian Diesch, Radu Rădeanu, Ask, belacq Apr 17 at 16:10

This question appears to be off-topic. The users who voted to close gave this specific reason:

  • "Bug reports and problems with the development version of Ubuntu should be reported on Launchpad so that developers can see, track and fix these issues." – Jorge Castro, Florian Diesch, Radu Rădeanu, Ask, belacq
If this question can be reworded to fit the rules in the help center, please edit the question.

1 Answer 1

After a bit more googling I found someone else who had a similar problem who noticed "Fatal: No composite extension" in their unity log as well, then looked in their xorg.conf to find:

Section "Extensions"
    Option         "Composite" "Disable"
EndSection

I found that in mine, too. And changing "Disable" to "Enable" allows unity to run. I guess nvidia-settings puts that in there by default for some reason. I still have some major stability problems, but everything appears to work for some brief periods of time.

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