hardware – Graphics glitch – checkered pattern in Chrome

I’ve had this MacBook Pro (16-inch, 2019) for a while now, but today it glitched out with huge green fields in all apps.

After a reboot I see this checkered black/green glitch pattern in Google Chrome on some sites, in some “sizes”. Basically if I resize the browser window the glitch goes away, but if I resize it too much it comes back.

Happens both on the internal and on external display.

I am hoping this is a software glitch, but I am afraid it’s my graphics card. Would be very grateful if someone knows the answer.

Here’s the stackoverflow logo with the glitch:

StackOverflow logo glitched

How long before confidence with graphics?

How long was it before you became confident at creating graphics? I find that I’m still a little shy about showing people what I can do and I’ve been doing graphics for 30 years now.

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graphics card – Updating Firmware on GTX 650

80.07.35.00.58 what is 1 version older firmware that sill have ” UEFI Supported: Yes ” installs. For now this solves the problem. It runs slowly in the newly opened window and it also stops to ask for permission for the update. After updating techpowerup GPU-Z.2.38.0 shows the new firmware.

The latest firmware ” 80.07.35.00.9D ” runs very quickly, darkens the screen for 1 second. I don’t have the opportunity to check for errors.

graphics – Unsupported driver and OPEN GL problems

I’m trying to use an old computer with linux ubuntu 20.04.

Unfortunately my graphic card (ATI XPRESS 200m) is not well supported… the “radeon” open source drivers is buggued and most softwares hangs even simple ones….

Is there a way to install a better driver ?
Is there a way to complettly disable OPEN GL and use software emulation instead ?

Even glxinfo does segmentation fault !!!

Exemple:
glxinfo
name of display: :0
display: :0 screen: 0
direct rendering: Yes
server glx vendor string: SGI
server glx version string: 1.4
server glx extensions:
GLX_ARB_create_context, GLX_ARB_create_context_no_error,
GLX_ARB_create_context_profile, GLX_ARB_fbconfig_float,
GLX_ARB_framebuffer_sRGB, GLX_ARB_multisample,
GLX_EXT_create_context_es2_profile, GLX_EXT_create_context_es_profile,
GLX_EXT_fbconfig_packed_float, GLX_EXT_framebuffer_sRGB,
GLX_EXT_import_context, GLX_EXT_libglvnd, GLX_EXT_no_config_context,
GLX_EXT_texture_from_pixmap, GLX_EXT_visual_info, GLX_EXT_visual_rating,
GLX_INTEL_swap_event, GLX_MESA_copy_sub_buffer, GLX_OML_swap_method,
GLX_SGIS_multisample, GLX_SGIX_fbconfig, GLX_SGIX_pbuffer,
GLX_SGIX_visual_select_group, GLX_SGI_make_current_read,
GLX_SGI_swap_control
client glx vendor string: Mesa Project and SGI
client glx version string: 1.4
client glx extensions:
GLX_ARB_context_flush_control, GLX_ARB_create_context,
GLX_ARB_create_context_no_error, GLX_ARB_create_context_profile,
GLX_ARB_create_context_robustness, GLX_ARB_fbconfig_float,
GLX_ARB_framebuffer_sRGB, GLX_ARB_get_proc_address, GLX_ARB_multisample,
GLX_EXT_buffer_age, GLX_EXT_create_context_es2_profile,
GLX_EXT_create_context_es_profile, GLX_EXT_fbconfig_packed_float,
GLX_EXT_framebuffer_sRGB, GLX_EXT_import_context,
GLX_EXT_texture_from_pixmap, GLX_EXT_visual_info, GLX_EXT_visual_rating,
GLX_INTEL_swap_event, GLX_MESA_copy_sub_buffer,
GLX_MESA_multithread_makecurrent, GLX_MESA_query_renderer,
GLX_MESA_swap_control, GLX_OML_swap_method, GLX_OML_sync_control,
GLX_SGIS_multisample, GLX_SGIX_fbconfig, GLX_SGIX_pbuffer,
GLX_SGIX_visual_select_group, GLX_SGI_make_current_read,
GLX_SGI_swap_control, GLX_SGI_video_sync
GLX version: 1.4
GLX extensions:
GLX_ARB_create_context, GLX_ARB_create_context_no_error,
GLX_ARB_create_context_profile, GLX_ARB_fbconfig_float,
GLX_ARB_framebuffer_sRGB, GLX_ARB_get_proc_address, GLX_ARB_multisample,
GLX_EXT_create_context_es2_profile, GLX_EXT_create_context_es_profile,
GLX_EXT_fbconfig_packed_float, GLX_EXT_framebuffer_sRGB,
GLX_EXT_import_context, GLX_EXT_texture_from_pixmap, GLX_EXT_visual_info,
GLX_EXT_visual_rating, GLX_INTEL_swap_event, GLX_MESA_copy_sub_buffer,
GLX_MESA_query_renderer, GLX_MESA_swap_control, GLX_OML_swap_method,
GLX_OML_sync_control, GLX_SGIS_multisample, GLX_SGIX_fbconfig,
GLX_SGIX_pbuffer, GLX_SGIX_visual_select_group, GLX_SGI_make_current_read,
GLX_SGI_swap_control, GLX_SGI_video_sync
Extended renderer info (GLX_MESA_query_renderer):
Vendor: X.Org R300 Project (0x1002)
Device: ATI RS480 (0x5975)
Version: 20.2.6
Accelerated: yes
Video memory: 128MB
Unified memory: no
Preferred profile: compat (0x2)
Max core profile version: 0.0
Max compat profile version: 2.1
Max GLES1 profile version: 1.1
Max GLES(23) profile version: 2.0
OpenGL vendor string: X.Org R300 Project
OpenGL renderer string: ATI RS480
OpenGL version string: 2.1 Mesa 20.2.6
OpenGL shading language version string: 1.20
OpenGL extensions:
GL_AMD_shader_trinary_minmax, GL_ANGLE_texture_compression_dxt3,
GL_ANGLE_texture_compression_dxt5, GL_APPLE_packed_pixels,
GL_ARB_ES2_compatibility, GL_ARB_buffer_storage,
GL_ARB_clear_buffer_object, GL_ARB_clip_control,
GL_ARB_compressed_texture_pixel_storage, GL_ARB_copy_buffer,
GL_ARB_debug_output, GL_ARB_depth_texture, GL_ARB_draw_buffers,
GL_ARB_draw_elements_base_vertex, GL_ARB_explicit_attrib_location,
GL_ARB_explicit_uniform_location, GL_ARB_fragment_coord_conventions,
GL_ARB_fragment_program, GL_ARB_fragment_program_shadow,
GL_ARB_fragment_shader, GL_ARB_framebuffer_object,
GL_ARB_get_program_binary, GL_ARB_get_texture_sub_image,
GL_ARB_half_float_pixel, GL_ARB_half_float_vertex,
GL_ARB_instanced_arrays, GL_ARB_internalformat_query,
GL_ARB_internalformat_query2, GL_ARB_invalidate_subdata,
GL_ARB_map_buffer_alignment, GL_ARB_map_buffer_range, GL_ARB_multi_bind,
GL_ARB_multisample, GL_ARB_multitexture, GL_ARB_occlusion_query,
GL_ARB_occlusion_query2, GL_ARB_parallel_shader_compile,
GL_ARB_pixel_buffer_object, GL_ARB_point_parameters, GL_ARB_point_sprite,
GL_ARB_program_interface_query, GL_ARB_provoking_vertex,
GL_ARB_robustness, GL_ARB_sampler_objects, GL_ARB_separate_shader_objects,
GL_ARB_shader_atomic_counter_ops, GL_ARB_shader_atomic_counters,
GL_ARB_shader_image_load_store, GL_ARB_shader_image_size,
GL_ARB_shader_objects, GL_ARB_shading_language_100,
GL_ARB_shading_language_include, GL_ARB_shadow, GL_ARB_sync,
GL_ARB_texture_barrier, GL_ARB_texture_border_clamp,
GL_ARB_texture_compression, GL_ARB_texture_cube_map,
GL_ARB_texture_env_add, GL_ARB_texture_env_combine,
GL_ARB_texture_env_crossbar, GL_ARB_texture_env_dot3,
GL_ARB_texture_filter_anisotropic, GL_ARB_texture_float,
GL_ARB_texture_mirror_clamp_to_edge, GL_ARB_texture_mirrored_repeat,
GL_ARB_texture_non_power_of_two, GL_ARB_texture_rectangle,
GL_ARB_texture_rg, GL_ARB_texture_storage, GL_ARB_transpose_matrix,
GL_ARB_vertex_array_bgra, GL_ARB_vertex_array_object,
GL_ARB_vertex_attrib_binding, GL_ARB_vertex_buffer_object,
GL_ARB_vertex_program, GL_ARB_vertex_shader,
GL_ARB_vertex_type_10f_11f_11f_rev, GL_ARB_vertex_type_2_10_10_10_rev,
GL_ARB_window_pos, GL_ATI_blend_equation_separate, GL_ATI_draw_buffers,
GL_ATI_fragment_shader, GL_ATI_separate_stencil,
GL_ATI_texture_env_combine3, GL_ATI_texture_float,
GL_ATI_texture_mirror_once, GL_EXT_EGL_image_storage, GL_EXT_EGL_sync,
GL_EXT_abgr, GL_EXT_bgra, GL_EXT_blend_color,
GL_EXT_blend_equation_separate, GL_EXT_blend_func_separate,
GL_EXT_blend_minmax, GL_EXT_blend_subtract, GL_EXT_compiled_vertex_array,
GL_EXT_copy_texture, GL_EXT_direct_state_access,
GL_EXT_draw_range_elements, GL_EXT_fog_coord, GL_EXT_framebuffer_blit,
GL_EXT_framebuffer_multisample, GL_EXT_framebuffer_multisample_blit_scaled,
GL_EXT_framebuffer_object, GL_EXT_gpu_program_parameters,
GL_EXT_multi_draw_arrays, GL_EXT_packed_depth_stencil,
GL_EXT_packed_pixels, GL_EXT_pixel_buffer_object, GL_EXT_point_parameters,
GL_EXT_provoking_vertex, GL_EXT_rescale_normal, GL_EXT_secondary_color,
GL_EXT_separate_specular_color, GL_EXT_shadow_funcs,
GL_EXT_stencil_two_side, GL_EXT_stencil_wrap, GL_EXT_subtexture,
GL_EXT_texture, GL_EXT_texture3D, GL_EXT_texture_compression_dxt1,
GL_EXT_texture_compression_s3tc, GL_EXT_texture_cube_map,
GL_EXT_texture_edge_clamp, GL_EXT_texture_env_add,
GL_EXT_texture_env_combine, GL_EXT_texture_env_dot3,
GL_EXT_texture_filter_anisotropic, GL_EXT_texture_lod_bias,
GL_EXT_texture_mirror_clamp, GL_EXT_texture_object,
GL_EXT_texture_rectangle, GL_EXT_texture_sRGB, GL_EXT_texture_sRGB_R8,
GL_EXT_texture_sRGB_decode, GL_EXT_texture_snorm, GL_EXT_vertex_array,
GL_EXT_vertex_array_bgra, GL_IBM_multimode_draw_arrays,
GL_IBM_rasterpos_clip, GL_IBM_texture_mirrored_repeat,
GL_INGR_blend_func_separate, GL_KHR_context_flush_control, GL_KHR_debug,
GL_KHR_no_error, GL_KHR_parallel_shader_compile,
GL_KHR_texture_compression_astc_ldr,
GL_KHR_texture_compression_astc_sliced_3d, GL_MESA_pack_invert,
GL_MESA_texture_signed_rgba, GL_MESA_window_pos, GL_MESA_ycbcr_texture,
GL_NV_blend_square, GL_NV_conditional_render, GL_NV_copy_image,
GL_NV_fog_distance, GL_NV_light_max_exponent, GL_NV_packed_depth_stencil,
GL_NV_primitive_restart, GL_NV_texgen_reflection, GL_NV_texture_barrier,
GL_NV_texture_env_combine4, GL_NV_texture_rectangle, GL_OES_EGL_image,
GL_OES_read_format, GL_S3_s3tc, GL_SGIS_generate_mipmap,
GL_SGIS_texture_border_clamp, GL_SGIS_texture_edge_clamp,
GL_SGIS_texture_lod, GL_SUN_multi_draw_arrays
Erreur de segmentation (core dumped)

replace with graphics

I was wondering whether the Moderator and Admin tab could be provided with a graphic.
If so, where and how would it work?

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graphics – Large slowdown with more general code

I have the following code

c0 := -1.24;
b := 0.125;

hh({x_, y_}) := {x^2 + c0 - b*y, x};
hh2({x_, y_}) := hh(hh({x, y}));
dhh := Transpose({!(
*SubscriptBox(((PartialD)), (x)) (hh({x, y}))), !(
*SubscriptBox(((PartialD)), (y))(hh({x, y})))});
dhh2 := Transpose({!(
*SubscriptBox(((PartialD)), (x)) (hh(hh({x, y})))), !(
*SubscriptBox(((PartialD)), (y)) (hh(hh({x, y}))))});
fixpoints = NSolve(hh({x, y}) == {x, y}, {x, y});
period2cycle = NSolve(hh(hh({x, y})) == {x, y}, {x, y});
center = {x, y} /. fixpoints((1));
centerOther = {x, y} /. fixpoints((2));
pushvector = Eigensystem(dhh /. fixpoints((1)))((2, 1));
pushvectorOther = Eigensystem(dhh /. fixpoints((2)))((2, 1));
sink = {x, y} /. period2cycle((1));
centerOther = {x, y} /. fixpoints((2));
pushvector2 = Eigensystem(dhh /. fixpoints((2)))((2, 1));
Eigensystem(dhh /. fixpoints((1)));
Eigensystem(dhh /. fixpoints((2)));
maxIter = 63;
maxXXSize = 600;
maxYYSize = 600;
smalldelta = .05/maxXXSize;
newfun({{x_, y_}, n_}) := {hh({x, y}), n + 1};
eNorm({x_, y_}) := Sqrt(Abs(x^2) + Abs(y^2));
newtest({{x_, y_}, 
    n_}) := (Abs(x) < 10000) && (eNorm({x, y} - sink) > .001);
newcolorassign({{x_, y_}, n_}) := Which(
   Abs(x) < 3, {0, 0, 0},
   Mod(Floor(Arg(x) /2^16), 2) > 0, {.5, .5, .5},
   True, {1, 1, 1}
   );

Note: in the notebook the SubscriptBox part is typeset as $partial_x$.

Using the above commands we can compute the following which takes around a minute.

Graphics({Raster(
    Table(newcolorassign(
      NestWhile(
       newfun, {center - 
         pushvector*smalldelta*
          I*(k - maxXXSize/2 + I*(j - maxYYSize/2)), 0}, newtest, 1, 
       maxIter)),
     {k, 1, maxXXSize}, {j, 1, maxYYSize})), PointSize(12/maxXXSize),
   White, Point({(maxXXSize - 1)/2, (maxYYSize - 1)/2}),
   PointSize(4/maxXXSize), Black,
   Point({(maxXXSize - 1)/2, (maxYYSize - 1)/2})});

I am trying to make this dependent on $b$ and $c$ so instead of starting a new notebook every time I want a picture for a parameter pair $(b,c)$.

I have tried the following:

hh1({x_, y_}, b_, c_) := {x^2 + c - b*y, x};
hhhh({x_, y_}, b_, c_) := hh1(hh1({x, y}, b, c), b, c);
dhhh(b_, c_) := Transpose({!(
*SubscriptBox(((PartialD)), (x)) (hh1({x, y}, b, c))), !(
*SubscriptBox(((PartialD)), (y))(hh1({x, y}, b, c)))});
dhhh2(b_, c_) := Transpose({!(
*SubscriptBox(((PartialD)), (x)) (hhhh({x, y}, b, c))), !(
*SubscriptBox(((PartialD)), (y)) (hhhh({x, y}, b, c)))});
fixpts(b_, c_) := NSolve(hh1({x, y}, b, c) == {x, y}, {x, y})
per2cycle(b_, c_) := NSolve(hhhh({x, y}, b, c) == {x, y}, {x, y})
centre(b_, c_) := {x, y} /. fixpts(b, c)((1));
centreOther(b_, c_) := {x, y} /. fixpts(b, c)((2));
pushvect(b_, c_) := 
  Eigensystem(dhhh(b, c) /. fixpts(b, c)((1)))((2, 1));
pushvectOther(b_, c_) := 
  Eigensystem(dhhh(b, c) /. fixpts(b, c)((2)))((2, 1));
snk(b_, c_) := {x, y} /. per2cycle(b, c)((1));

pushvect2(b_, c_) := 
  Eigensystem(dhhh(b, c) /. fixpts(b, c)((2)))((2, 1));
maxIter = 63;
maxXXSize = 600;
maxYYSize = 600;
smalldelta = .05/maxXXSize;
newfun({{x_, y_}, b_, c_, n_}) := {hh1({x, y}, b, c), n + 1};
eNorm({x_, y_}) := Sqrt(Abs(x^2) + Abs(y^2));


newtest({{x_, y_}, b_, c_, 
    n_}) := (Abs(x) < 10000) && (eNorm({x, y} - snk(b, c)) > .001);
newcolorassign({{x_, y_}, n_}) := Which(
   Abs(x) < 3, {0, 0, 0},
   Mod(Floor(Arg(x) /2^16), 2) > 0, {.5, .5, .5},
   True, {1, 1, 1}
   );
unstablepic(b_, c_) := 
  Graphics({Raster(
     Table(newcolorassign(
       NestWhile(
        newfun, {centre(b, c) - 
          pushvect(b, c)*smalldelta*
           I*(k - maxXXSize/2 + I*(j - maxYYSize/2)), 0}, newtest, 1, 
        maxIter)),
      {k, 1, maxXXSize}, {j, 1, maxYYSize})), PointSize(12/maxXXSize),
    White, Point({(maxXXSize - 1)/2, (maxYYSize - 1)/2}),
    PointSize(4/maxXXSize), Black,
    Point({(maxXXSize - 1)/2, (maxYYSize - 1)/2})});

I have tried some smaller values in the table, say changing maxYYSizeand maxYYSize to 60 and the table computes so the code seems to be working correctly.

However, when we revert to maxYYSizeand maxYYSize this doesn’t seem to compute as quickly as the original code, despite seemingly being the same. I’m not sure if this is a slowdown due to the more general code or because there is an error I can’t find.

Is there some way to fix this?

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