Ciao.
Sono un utente Windows alla sua prima esperienza con Linux.
Su un vecchio portatile Packard Bell EasyNote ho installato Debian 7.7 Wheezy con Gnome 3.4.2.
Tutti gli elementi dell'interfaccia grafica (barre dei menu e degli strumenti, menu a tendina, ecc.) mi sembrano visualizzati a dimensioni eccessive, come con Windows in modalità provvisoria.
Da "Impostazioni di sistema>Monitor" risulta una risoluzione 1024x768, la massima possibile.
Sul computer era installato Windows XP, e mi sembrava che la visualizzazione fosse migliore.
Cerco di fornirvi le poche informazioni che sono riuscito a ottenere:

lshw -c display
*-display UNCLAIMED
description: VGA compatible controller
product: K8M800/K8N800/K8N800A [S3 UniChrome Pro]
vendor: VIA Technologies, Inc.
physical id: 0
bus info: pci@0000:01:00.0
version: 01
width: 32 bits
clock: 66MHz
capabilities: pm agp agp-3.0 vga_controller bus_master cap_list
configuration: latency=128 mingnt=2
resources: memory:a4000000-a7ffffff memory:e1000000-e1ffffff memory:a0000000-a000ffff


glxinfo
name of display: :0.0
display: :0 screen: 0
direct rendering: Yes
server glx vendor string: SGI
server glx version string: 1.4
server glx extensions:
GLX_ARB_multisample, GLX_EXT_visual_info, GLX_EXT_visual_rating,
GLX_EXT_import_context, GLX_EXT_texture_from_pixmap, GLX_OML_swap_method,
GLX_SGI_make_current_read, GLX_SGIS_multisample, GLX_SGIX_fbconfig,
GLX_SGIX_pbuffer, GLX_MESA_copy_sub_buffer, GLX_INTEL_swap_event
client glx vendor string: Mesa Project and SGI
client glx version string: 1.4
client glx extensions:
GLX_ARB_create_context, GLX_ARB_create_context_profile,
GLX_ARB_get_proc_address, GLX_ARB_multisample, GLX_EXT_import_context,
GLX_EXT_visual_info, GLX_EXT_visual_rating, GLX_EXT_framebuffer_sRGB,
GLX_EXT_create_context_es2_profile, GLX_MESA_copy_sub_buffer,
GLX_MESA_multithread_makecurrent, GLX_MESA_swap_control,
GLX_OML_swap_method, GLX_OML_sync_control, GLX_SGI_make_current_read,
GLX_SGI_swap_control, GLX_SGI_video_sync, GLX_SGIS_multisample,
GLX_SGIX_fbconfig, GLX_SGIX_pbuffer, GLX_SGIX_visual_select_group,
GLX_EXT_texture_from_pixmap, GLX_INTEL_swap_event
GLX version: 1.4
GLX extensions:
GLX_ARB_get_proc_address, GLX_ARB_multisample, GLX_EXT_import_context,
GLX_EXT_visual_info, GLX_EXT_visual_rating,
GLX_MESA_multithread_makecurrent, GLX_OML_swap_method,
GLX_SGI_make_current_read, GLX_SGIS_multisample, GLX_SGIX_fbconfig,
GLX_SGIX_pbuffer, GLX_EXT_texture_from_pixmap
OpenGL vendor string: VMware, Inc.
OpenGL renderer string: Gallium 0.4 on llvmpipe (LLVM 0x209)
OpenGL version string: 2.1 Mesa 8.0.5
OpenGL shading language version string: 1.20
OpenGL extensions:
GL_ARB_multisample, GL_EXT_abgr, GL_EXT_bgra, GL_EXT_blend_color,
GL_EXT_blend_minmax, GL_EXT_blend_subtract, GL_EXT_copy_texture,
GL_EXT_polygon_offset, GL_EXT_subtexture, GL_EXT_texture_object,
GL_EXT_vertex_array, GL_EXT_compiled_vertex_array, GL_EXT_texture,
GL_EXT_texture3D, GL_IBM_rasterpos_clip, GL_ARB_point_parameters,
GL_EXT_draw_range_elements, GL_EXT_packed_pixels, GL_EXT_point_parameters,
GL_EXT_rescale_normal, GL_EXT_separate_specular_color,
GL_EXT_texture_edge_clamp, GL_SGIS_generate_mipmap,
GL_SGIS_texture_border_clamp, GL_SGIS_texture_edge_clamp,
GL_SGIS_texture_lod, GL_ARB_multitexture, GL_IBM_multimode_draw_arrays,
GL_IBM_texture_mirrored_repeat, GL_ARB_texture_cube_map,
GL_ARB_texture_env_add, GL_ARB_transpose_matrix,
GL_EXT_blend_func_separate, GL_EXT_fog_coord, GL_EXT_multi_draw_arrays,
GL_EXT_secondary_color, GL_EXT_texture_env_add, GL_EXT_texture_lod_bias,
GL_INGR_blend_func_separate, GL_NV_blend_square, GL_NV_light_max_exponent,
GL_NV_texgen_reflection, GL_NV_texture_env_combine4,
GL_SUN_multi_draw_arrays, GL_ARB_texture_border_clamp,
GL_ARB_texture_compression, GL_EXT_framebuffer_object,
GL_EXT_texture_env_combine, GL_EXT_texture_env_dot3, GL_MESA_window_pos,
GL_NV_packed_depth_stencil, GL_NV_texture_rectangle, GL_ARB_depth_texture,
GL_ARB_occlusion_query, GL_ARB_shadow, GL_ARB_texture_env_combine,
GL_ARB_texture_env_crossbar, GL_ARB_texture_env_dot3,
GL_ARB_texture_mirrored_repeat, GL_ARB_window_pos,
GL_EXT_stencil_two_side, GL_EXT_texture_cube_map, GL_NV_fog_distance,
GL_APPLE_packed_pixels, GL_APPLE_vertex_array_object, GL_ARB_draw_buffers,
GL_ARB_fragment_program, GL_ARB_fragment_shader, GL_ARB_shader_objects,
GL_ARB_vertex_program, GL_ARB_vertex_shader, GL_ATI_draw_buffers,
GL_ATI_texture_env_combine3, GL_ATI_texture_float, GL_EXT_shadow_funcs,
GL_EXT_stencil_wrap, GL_MESA_pack_invert, GL_MESA_ycbcr_texture,
GL_NV_primitive_restart, GL_ARB_fragment_program_shadow,
GL_ARB_half_float_pixel, GL_ARB_occlusion_query2, GL_ARB_point_sprite,
GL_ARB_shading_language_100, GL_ARB_sync, GL_ARB_texture_non_power_of_two,
GL_ARB_vertex_buffer_object, GL_ATI_blend_equation_separate,
GL_EXT_blend_equation_separate, GL_OES_read_format,
GL_ARB_pixel_buffer_object, GL_ARB_texture_compression_rgtc,
GL_ARB_texture_float, GL_ARB_texture_rectangle,
GL_ATI_texture_compression_3dc, GL_EXT_packed_float,
GL_EXT_pixel_buffer_object, GL_EXT_texture_compression_rgtc,
GL_EXT_texture_mirror_clamp, GL_EXT_texture_rectangle,
GL_EXT_texture_sRGB, GL_EXT_texture_shared_exponent,
GL_ARB_framebuffer_object, GL_EXT_framebuffer_blit,
GL_EXT_framebuffer_multisample, GL_EXT_packed_depth_stencil,
GL_ARB_vertex_array_object, GL_ATI_separate_stencil,
GL_ATI_texture_mirror_once, GL_EXT_draw_buffers2, GL_EXT_draw_instanced,
GL_EXT_gpu_program_parameters, GL_EXT_texture_compression_latc,
GL_EXT_texture_sRGB_decode, GL_OES_EGL_image, GL_ARB_copy_buffer,
GL_ARB_draw_instanced, GL_ARB_half_float_vertex, GL_ARB_instanced_arrays,
GL_ARB_map_buffer_range, GL_ARB_texture_rg, GL_ARB_texture_swizzle,
GL_ARB_vertex_array_bgra, GL_EXT_separate_shader_objects,
GL_EXT_texture_swizzle, GL_EXT_vertex_array_bgra,
GL_NV_conditional_render, GL_AMD_draw_buffers_blend,
GL_ARB_ES2_compatibility, GL_ARB_draw_buffers_blend,
GL_ARB_draw_elements_base_vertex, GL_ARB_explicit_attrib_location,
GL_ARB_fragment_coord_conventions, GL_ARB_provoking_vertex,
GL_ARB_sampler_objects, GL_ARB_shader_texture_lod,
GL_ARB_vertex_type_2_10_10_10_rev, GL_EXT_provoking_vertex,
GL_EXT_texture_snorm, GL_MESA_texture_signed_rgba, GL_ARB_robustness,
GL_ARB_texture_storage

Grazie per i vostri suggerimenti.