Compiz/Beryl was working fine for me in feisty. I've just finished the upgrade to gutsy, and it's no longer working.
I have the following packages installed:
i compiz - OpenGL window and compositing manager
i A compiz-core - OpenGL window and compositing manager
i compiz-fusion-plugins-extra - Collection of extra plugins from OpenCompo
i A compiz-fusion-plugins-main - Collection of plugins from OpenCompositing
i A compiz-gnome - OpenGL window and compositing manager - GN
i A compiz-plugins - OpenGL window and compositing manager - pl
i A libcompizconfig-backend-gconf - Settings library for plugins - OpenComposi
i A libcompizconfig0 - Settings library for plugins - OpenComposi
glxgears -info gives:
GL_RENDERER = GeForce4 440 Go 64M/AGP/SSE2/3DNOW!
GL_VERSION = 1.5.8 NVIDIA 96.39
GL_VENDOR = NVIDIA Corporation
GL_EXTENSIONS = GL_ARB_imaging GL_ARB_multitexture GL_ARB_pixel_buffer_object GL_ARB_point_parameters GL_ARB_point_sprite GL_ARB_shader_objects GL_ARB_shading_language_100 GL_ARB_texture_compression GL_ARB_texture_cube_map GL_ARB_texture_env_add GL_ARB_texture_env_combine GL_ARB_texture_env_dot3 GL_ARB_texture_mirrored_repeat GL_ARB_texture_rectangle GL_ARB_transpose_matrix GL_ARB_vertex_buffer_object GL_ARB_vertex_program GL_ARB_vertex_shader GL_ARB_window_pos GL_S3_s3tc GL_EXT_texture_env_add GL_EXT_abgr GL_EXT_bgra GL_EXT_blend_color GL_EXT_blend_minmax GL_EXT_blend_subtract GL_EXT_clip_volume_hint GL_EXT_compiled_vertex_array GL_EXT_Cg_shader GL_EXT_draw_range_elements GL_EXT_fog_coord GL_EXT_gpu_program_parameters GL_EXT_multi_draw_arrays GL_EXT_packed_pixels GL_EXT_paletted_texture GL_EXT_pixel_buffer_object GL_EXT_point_parameters GL_EXT_rescale_normal GL_EXT_secondary_color GL_EXT_separate_specular_color GL_EXT_shared_texture_palette GL_EXT_stencil_wrap GL_EXT_texture_compression_s3tc GL_EXT_texture_cube_map GL_EXT_texture_edge_clamp GL_EXT_texture_env_combine GL_EXT_texture_env_dot3 GL_EXT_texture_filter_anisotropic GL_EXT_texture_lod GL_EXT_texture_lod_bias GL_EXT_texture_object GL_EXT_vertex_array GL_IBM_rasterpos_clip GL_IBM_texture_mirrored_repeat GL_KTX_buffer_region GL_NV_blend_square GL_NV_fence GL_NV_fog_distance GL_NV_light_max_exponent GL_NV_packed_depth_stencil GL_NV_pixel_data_range GL_NV_point_sprite GL_NV_register_combiners GL_NV_texgen_reflection GL_NV_texture_env_combine4 GL_NV_texture_rectangle GL_NV_vertex_array_range GL_NV_vertex_array_range2 GL_NV_vertex_program GL_NV_vertex_program1_1 GL_SGIS_generate_mipmap GL_SGIS_multitexture GL_SGIS_texture_lod GL_SUN_slice_accum
9585 frames in 5.0 seconds = 1915.833 FPS
9841 frames in 5.0 seconds = 1968.102 FPS
Running compiz --replace gives:
Checking for Xgl: not present. \nChecking for texture_from_pixmap: present. \nChecking for non power of two support: present. \nChecking for Composite extension: present. \nChecking for nVidia: present. \nChecking for Xgl: not present. \n
Please let me know if there's any other information needed.
You need to add AddARGBGLXVisuals in the Device section of your xorg.conf.