I am not completely sure the same bug affects me, but it is at least
closely related.

I am also trying to get a two seat setup working. The first seat is on
the primary graphics card which is the internal Intel card for a core i5
2400. The second seat is on a Radeon HD 5450 (PCI-Express).

Unity works well in the first seat, however it does not work well in the
second seat. Usually the first attempt after booting ends up with  a
non-functional desktop (usually with the nautilus menu on top, some
times a screen with only the background). It seems that something is not
initialized because if I open a terminal and try
/usr/lib/nux/unity_support_test -p, I get:

OpenGL vendor string:   Mesa Project
OpenGL renderer string: Software Rasterizer
OpenGL version string:  2.1 Mesa 7.11

Not software rendered:    no
Not blacklisted:          yes
GLX fbconfig:             yes
GLX texture from pixmap:  no
GL npot or rect textures: yes
GL vertex program:        yes
GL fragment program:      yes
GL vertex buffer object:  yes
GL framebuffer object:    yes
GL version is 1.4+:       yes

Unity 3D supported:       no

After logging out and coming back unity seems to work and
/usr/lib/nux/unity_support_test -p gives:

OpenGL vendor string:   X.Org
OpenGL renderer string: Gallium 0.4 on AMD CEDAR
OpenGL version string:  2.1 Mesa 7.11

Not software rendered:    yes
Not blacklisted:          yes
GLX fbconfig:             yes
GLX texture from pixmap:  yes
GL npot or rect textures: yes
GL vertex program:        yes
GL fragment program:      yes
GL vertex buffer object:  yes
GL framebuffer object:    yes
GL version is 1.4+:       yes

Unity 3D supported:       yes

So it looks like the Gallium 3D driver is only loaded on the second try
(sometimes I need to try 3 or more times).

Another interesting catch is that 3D seems to be working even in the
first try when unity does not (if I call glxgears it give the same
number of frames it gives in the second try when  unity_support_test
says that Gallium driver is working).

Two other interesting notes is that unity-2d works always for me (and I
don't know why it is not started in the first run, as unity_support_test
is saying that regular unity is not supported).  Gnome shell also seems
to work always.

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https://bugs.launchpad.net/bugs/883225

Title:
  Unity looks strange when used in multiseat setup

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