View Full Version : [ubuntu] 11.10: Unity 2D/3D Slow on one monitor, Normal on another

October 20th, 2011, 07:36 PM

I've been struggling to find out why both Unity 2D/3D is slow/laggy on Ubuntu 11.10. 2D is much better than 3D but is still noticeably slow.

Gnome-shell does not exhibit this behavior and seems to work just fine.

This is a Dell p390 with 4GB of RAM and a Core2 CPU.

unity_support_test -p output:

/usr/lib/nux/unity_support_test -p
OpenGL vendor string: NVIDIA Corporation
OpenGL renderer string: Quadro NVS 285/PCI/SSE2
OpenGL version string: 2.1.2 NVIDIA 280.13

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

I have tried this same setup with 2 different monitors, a 24" ViewSonic monitor and a (15"?) NEC monitor. The larger ViewSonic monitor is the one Unity is slow/laggy on. On the NEC monitor, Unity 2D/3D works just fine. Gnome-shell works with no issues on both monitors.

I have attached the xorg.conf files, one for the ViewSonic and one for the NEC, both created by nvidia-settings. You will find they are practically identical.

Any ideas on what is going on?