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    Radeon 3000 RS780L weird graphical artifacts

    Hey folks,

    I just noticed that I sometimes have strange graphical artifacts. They seem to be linked to red-ish sections of the screen. At the bottom of this post there are two examples. Apart from that everything seems to be running well. Turning off the compositor does not change anything. Does anyone have a clue, what could be going on here?

    Thanks!
    Björn

    Code:
    [FONT=monospace]xwininfo: Window id: 0x4c7 (the root window) (has no name)
    
    Absolute upper-left X:  0
    Absolute upper-left Y:  0
    Relative upper-left X:  0
    Relative upper-left Y:  0
    Width: 1920
    Height: 1080
    Depth: 24
    Visual: 0x21
    Visual Class: TrueColor
    Border width: 0
    Class: InputOutput
    Colormap: 0x20 (installed)
    Bit Gravity State: ForgetGravity
    Window Gravity State: NorthWestGravity
    Backing Store State: NotUseful
    Save Under State: no
    Map State: IsViewable
    Override Redirect State: no
    Corners:  +0+0  -0+0  -0-0  +0-0
    -geometry 1920x1080+0+0
    [/FONT]
    Code:
    [FONT=monospace]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_create_context_robustness,  
      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_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_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_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 (0x1002)
      Device: AMD RS780 (DRM 2.50.0 / 4.18.0-13-generic, LLVM 7.0.0) (0x9616)
      Version: 18.2.2
      Accelerated: yes
      Video memory: 256MB
      Unified memory: no
      Preferred profile: core (0x1)
      Max core profile version: 3.3
      Max compat profile version: 3.0
      Max GLES1 profile version: 1.1
      Max GLES[23] profile version: 3.0
    Memory info (GL_ATI_meminfo):
      VBO free memory - total: 255 MB, largest block: 255 MB
      VBO free aux. memory - total: 509 MB, largest block: 509 MB
      Texture free memory - total: 255 MB, largest block: 255 MB
      Texture free aux. memory - total: 509 MB, largest block: 509 MB
      Renderbuffer free memory - total: 255 MB, largest block: 255 MB
      Renderbuffer free aux. memory - total: 509 MB, largest block: 509 MB
    Memory info (GL_NVX_gpu_memory_info):
      Dedicated video memory: 256 MB
      Total available memory: 765 MB
      Currently available dedicated video memory: 255 MB
    OpenGL vendor string: X.Org
    OpenGL renderer string: AMD RS780 (DRM 2.50.0 / 4.18.0-13-generic, LLVM 7.0.0)
    OpenGL core profile version string: 3.3 (Core Profile) Mesa 18.2.2
    OpenGL core profile shading language version string: 3.30
    OpenGL core profile context flags: (none)
    OpenGL core profile profile mask: core profile
    OpenGL core profile extensions:
      GL_AMD_conservative_depth, GL_AMD_draw_buffers_blend,  
      GL_AMD_performance_monitor, GL_AMD_pinned_memory,  
      GL_AMD_shader_stencil_export, GL_AMD_shader_trinary_minmax,  
      GL_AMD_vertex_shader_layer, GL_AMD_vertex_shader_viewport_index,  
      GL_ANGLE_texture_compression_dxt3, GL_ANGLE_texture_compression_dxt5,  
      GL_ARB_ES2_compatibility, GL_ARB_ES3_compatibility,  
      GL_ARB_arrays_of_arrays, GL_ARB_base_instance, GL_ARB_blend_func_extended,  
      GL_ARB_buffer_storage, GL_ARB_clear_buffer_object, GL_ARB_clear_texture,  
      GL_ARB_clip_control, GL_ARB_compressed_texture_pixel_storage,  
      GL_ARB_conditional_render_inverted, GL_ARB_conservative_depth,  
      GL_ARB_copy_buffer, GL_ARB_copy_image, GL_ARB_cull_distance,  
      GL_ARB_debug_output, GL_ARB_depth_buffer_float, GL_ARB_depth_clamp,  
      GL_ARB_direct_state_access, GL_ARB_draw_buffers,  
      GL_ARB_draw_buffers_blend, GL_ARB_draw_elements_base_vertex,  
      GL_ARB_draw_instanced, GL_ARB_explicit_attrib_location,  
      GL_ARB_explicit_uniform_location, GL_ARB_fragment_coord_conventions,  
      GL_ARB_fragment_layer_viewport, GL_ARB_fragment_shader,  
      GL_ARB_framebuffer_no_attachments, GL_ARB_framebuffer_object,  
      GL_ARB_framebuffer_sRGB, 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_occlusion_query2,  
      GL_ARB_pipeline_statistics_query, GL_ARB_pixel_buffer_object,  
      GL_ARB_point_sprite, GL_ARB_polygon_offset_clamp,  
      GL_ARB_program_interface_query, GL_ARB_provoking_vertex,  
      GL_ARB_robust_buffer_access_behavior, GL_ARB_robustness,  
      GL_ARB_sample_shading, GL_ARB_sampler_objects, GL_ARB_seamless_cube_map,  
      GL_ARB_separate_shader_objects, GL_ARB_shader_bit_encoding,  
      GL_ARB_shader_objects, GL_ARB_shader_stencil_export,  
      GL_ARB_shader_subroutine, GL_ARB_shader_texture_image_samples,  
      GL_ARB_shader_texture_lod, GL_ARB_shading_language_420pack,  
      GL_ARB_shading_language_packing, GL_ARB_stencil_texturing, GL_ARB_sync,  
      GL_ARB_texture_barrier, GL_ARB_texture_buffer_object,  
      GL_ARB_texture_buffer_object_rgb32, GL_ARB_texture_buffer_range,  
      GL_ARB_texture_compression_rgtc, GL_ARB_texture_filter_anisotropic,  
      GL_ARB_texture_float, GL_ARB_texture_mirror_clamp_to_edge,  
      GL_ARB_texture_multisample, GL_ARB_texture_non_power_of_two,  
      GL_ARB_texture_query_levels, GL_ARB_texture_rectangle, GL_ARB_texture_rg,  
      GL_ARB_texture_rgb10_a2ui, GL_ARB_texture_stencil8,  
      GL_ARB_texture_storage, GL_ARB_texture_storage_multisample,  
      GL_ARB_texture_swizzle, GL_ARB_timer_query, GL_ARB_transform_feedback2,  
      GL_ARB_transform_feedback3, GL_ARB_transform_feedback_instanced,  
      GL_ARB_uniform_buffer_object, GL_ARB_vertex_array_bgra,  
      GL_ARB_vertex_array_object, GL_ARB_vertex_attrib_binding,  
      GL_ARB_vertex_shader, GL_ARB_vertex_type_10f_11f_11f_rev,  
      GL_ARB_vertex_type_2_10_10_10_rev, GL_ARB_viewport_array,  
      GL_ATI_blend_equation_separate, GL_ATI_meminfo, GL_ATI_texture_float,  
      GL_ATI_texture_mirror_once, GL_EXT_abgr, GL_EXT_blend_equation_separate,  
      GL_EXT_draw_buffers2, GL_EXT_draw_instanced, GL_EXT_framebuffer_blit,  
      GL_EXT_framebuffer_multisample, GL_EXT_framebuffer_multisample_blit_scaled,  
      GL_EXT_framebuffer_sRGB, GL_EXT_packed_depth_stencil, GL_EXT_packed_float,  
      GL_EXT_pixel_buffer_object, GL_EXT_polygon_offset_clamp,  
      GL_EXT_provoking_vertex, GL_EXT_shader_integer_mix, GL_EXT_texture_array,  
      GL_EXT_texture_compression_dxt1, GL_EXT_texture_compression_rgtc,  
      GL_EXT_texture_compression_s3tc, GL_EXT_texture_filter_anisotropic,  
      GL_EXT_texture_integer, GL_EXT_texture_mirror_clamp, GL_EXT_texture_sRGB,  
      GL_EXT_texture_sRGB_decode, GL_EXT_texture_shared_exponent,  
      GL_EXT_texture_snorm, GL_EXT_texture_swizzle, GL_EXT_timer_query,  
      GL_EXT_transform_feedback, GL_EXT_vertex_array_bgra,  
      GL_IBM_multimode_draw_arrays, GL_KHR_context_flush_control, GL_KHR_debug,  
      GL_KHR_no_error, GL_KHR_robust_buffer_access_behavior, GL_KHR_robustness,  
      GL_KHR_texture_compression_astc_ldr, GL_MESA_pack_invert,  
      GL_MESA_shader_integer_functions, GL_MESA_texture_signed_rgba,  
      GL_NVX_gpu_memory_info, GL_NV_conditional_render, GL_NV_depth_clamp,  
      GL_NV_packed_depth_stencil, GL_NV_texture_barrier, GL_OES_EGL_image,  
      GL_S3_s3tc
    
    OpenGL version string: 3.0 Mesa 18.2.2
    OpenGL shading language version string: 1.30
    OpenGL context flags: (none)
    OpenGL extensions:
      GL_AMD_conservative_depth, GL_AMD_draw_buffers_blend,  
      GL_AMD_performance_monitor, GL_AMD_pinned_memory,  
      GL_AMD_shader_stencil_export, 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_ES3_compatibility, GL_ARB_arrays_of_arrays, GL_ARB_base_instance,  
      GL_ARB_blend_func_extended, GL_ARB_buffer_storage,  
      GL_ARB_clear_buffer_object, GL_ARB_clear_texture, GL_ARB_clip_control,  
      GL_ARB_color_buffer_float, GL_ARB_compressed_texture_pixel_storage,  
      GL_ARB_conditional_render_inverted, GL_ARB_conservative_depth,  
      GL_ARB_copy_buffer, GL_ARB_copy_image, GL_ARB_cull_distance,  
      GL_ARB_debug_output, GL_ARB_depth_buffer_float, GL_ARB_depth_clamp,  
      GL_ARB_depth_texture, GL_ARB_draw_buffers, GL_ARB_draw_buffers_blend,  
      GL_ARB_draw_elements_base_vertex, GL_ARB_draw_instanced,  
      GL_ARB_explicit_attrib_location, GL_ARB_explicit_uniform_location,  
      GL_ARB_fragment_coord_conventions, GL_ARB_fragment_layer_viewport,  
      GL_ARB_fragment_program, GL_ARB_fragment_program_shadow,  
      GL_ARB_fragment_shader, GL_ARB_framebuffer_no_attachments,  
      GL_ARB_framebuffer_object, GL_ARB_framebuffer_sRGB,  
      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_pipeline_statistics_query,  
      GL_ARB_pixel_buffer_object, GL_ARB_point_parameters, GL_ARB_point_sprite,  
      GL_ARB_polygon_offset_clamp, GL_ARB_program_interface_query,  
      GL_ARB_provoking_vertex, GL_ARB_robust_buffer_access_behavior,  
      GL_ARB_robustness, GL_ARB_sample_shading, GL_ARB_sampler_objects,  
      GL_ARB_seamless_cube_map, GL_ARB_separate_shader_objects,  
      GL_ARB_shader_bit_encoding, GL_ARB_shader_objects,  
      GL_ARB_shader_stencil_export, GL_ARB_shader_texture_image_samples,  
      GL_ARB_shader_texture_lod, GL_ARB_shading_language_100,  
      GL_ARB_shading_language_420pack, GL_ARB_shading_language_packing,  
      GL_ARB_shadow, GL_ARB_stencil_texturing, GL_ARB_sync,  
      GL_ARB_texture_barrier, GL_ARB_texture_border_clamp,  
      GL_ARB_texture_compression, GL_ARB_texture_compression_rgtc,  
      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_multisample,  
      GL_ARB_texture_non_power_of_two, GL_ARB_texture_query_levels,  
      GL_ARB_texture_rectangle, GL_ARB_texture_rg, GL_ARB_texture_rgb10_a2ui,  
      GL_ARB_texture_stencil8, GL_ARB_texture_storage,  
      GL_ARB_texture_storage_multisample, GL_ARB_texture_swizzle,  
      GL_ARB_timer_query, GL_ARB_transform_feedback2,  
      GL_ARB_transform_feedback3, GL_ARB_transform_feedback_instanced,  
      GL_ARB_transpose_matrix, GL_ARB_uniform_buffer_object,  
      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_viewport_array, GL_ARB_window_pos, GL_ATI_blend_equation_separate,  
      GL_ATI_draw_buffers, GL_ATI_fragment_shader, GL_ATI_meminfo,  
      GL_ATI_separate_stencil, GL_ATI_texture_compression_3dc,  
      GL_ATI_texture_env_combine3, GL_ATI_texture_float,  
      GL_ATI_texture_mirror_once, 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_draw_buffers2, GL_EXT_draw_instanced,  
      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_framebuffer_sRGB,  
      GL_EXT_gpu_program_parameters, GL_EXT_multi_draw_arrays,  
      GL_EXT_packed_depth_stencil, GL_EXT_packed_float, GL_EXT_packed_pixels,  
      GL_EXT_pixel_buffer_object, GL_EXT_point_parameters,  
      GL_EXT_polygon_offset_clamp, GL_EXT_provoking_vertex,  
      GL_EXT_rescale_normal, GL_EXT_secondary_color,  
      GL_EXT_separate_specular_color, GL_EXT_shader_integer_mix,  
      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_array, GL_EXT_texture_compression_dxt1,  
      GL_EXT_texture_compression_latc, GL_EXT_texture_compression_rgtc,  
      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_integer,  
      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_decode, GL_EXT_texture_shared_exponent,  
      GL_EXT_texture_snorm, GL_EXT_texture_swizzle, GL_EXT_timer_query,  
      GL_EXT_transform_feedback, 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_robust_buffer_access_behavior, GL_KHR_robustness,  
      GL_KHR_texture_compression_astc_ldr, GL_MESA_pack_invert,  
      GL_MESA_shader_integer_functions, GL_MESA_texture_signed_rgba,  
      GL_MESA_window_pos, GL_NVX_gpu_memory_info, GL_NV_blend_square,  
      GL_NV_conditional_render, GL_NV_depth_clamp, 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
    
    OpenGL ES profile version string: OpenGL ES 3.0 Mesa 18.2.2
    OpenGL ES profile shading language version string: OpenGL ES GLSL ES 3.00
    OpenGL ES profile extensions:
      GL_AMD_performance_monitor, GL_ANGLE_texture_compression_dxt3,  
      GL_ANGLE_texture_compression_dxt5, GL_APPLE_texture_max_level,  
      GL_EXT_base_instance, GL_EXT_blend_func_extended, GL_EXT_blend_minmax,  
      GL_EXT_clip_cull_distance, GL_EXT_color_buffer_float,  
      GL_EXT_compressed_ETC1_RGB8_sub_texture, GL_EXT_copy_image,  
      GL_EXT_discard_framebuffer, GL_EXT_draw_buffers,  
      GL_EXT_draw_buffers_indexed, GL_EXT_draw_elements_base_vertex,  
      GL_EXT_frag_depth, GL_EXT_map_buffer_range, GL_EXT_multi_draw_arrays,  
      GL_EXT_occlusion_query_boolean, GL_EXT_polygon_offset_clamp,  
      GL_EXT_read_format_bgra, GL_EXT_robustness,  
      GL_EXT_separate_shader_objects, GL_EXT_shader_integer_mix,  
      GL_EXT_texture_border_clamp, GL_EXT_texture_compression_dxt1,  
      GL_EXT_texture_filter_anisotropic, GL_EXT_texture_format_BGRA8888,  
      GL_EXT_texture_rg, GL_EXT_texture_sRGB_decode,  
      GL_EXT_texture_type_2_10_10_10_REV, GL_EXT_unpack_subimage,  
      GL_KHR_context_flush_control, GL_KHR_debug, GL_KHR_no_error,  
      GL_KHR_robust_buffer_access_behavior, GL_KHR_robustness,  
      GL_KHR_texture_compression_astc_ldr, GL_MESA_shader_integer_functions,  
      GL_NV_draw_buffers, GL_NV_fbo_color_attachments, GL_NV_read_buffer,  
      GL_NV_read_depth, GL_NV_read_depth_stencil, GL_NV_read_stencil,  
      GL_OES_EGL_image, GL_OES_EGL_image_external,  
      GL_OES_EGL_image_external_essl3, GL_OES_EGL_sync,  
      GL_OES_compressed_ETC1_RGB8_texture, GL_OES_copy_image, GL_OES_depth24,  
      GL_OES_depth_texture, GL_OES_depth_texture_cube_map,  
      GL_OES_draw_buffers_indexed, GL_OES_draw_elements_base_vertex,  
      GL_OES_element_index_uint, GL_OES_fbo_render_mipmap,  
      GL_OES_get_program_binary, GL_OES_mapbuffer, GL_OES_packed_depth_stencil,  
      GL_OES_required_internalformat, GL_OES_rgb8_rgba8,  
      GL_OES_standard_derivatives, GL_OES_stencil8, GL_OES_surfaceless_context,  
      GL_OES_texture_3D, GL_OES_texture_border_clamp, GL_OES_texture_float,  
      GL_OES_texture_float_linear, GL_OES_texture_half_float,  
      GL_OES_texture_half_float_linear, GL_OES_texture_npot,  
      GL_OES_texture_stencil8, GL_OES_vertex_array_object,  
      GL_OES_vertex_half_float
    [/FONT]



    #2
    Laptop display, or connected monitor display?

    Added:

    I just now changed my 18.10 wallpaper to the one you show in the second image. The area you identified isn't an aberration of the displayed wallpaper; it's how that background was created, as it displays exactly as your image shows. So, that said, what you think is a graphical artifact, isn't.
    Last edited by Snowhog; Feb 01, 2019, 11:17 AM.
    Windows no longer obstructs my view.
    Using Kubuntu Linux since March 23, 2007.
    "It is a capital mistake to theorize before one has data." - Sherlock Holmes

    Comment


      #3
      Hi,

      this computer is an All-In-One-PC, so basically a 24" monitor with some hardware attached at the back. This is the wallpaper file directly from my installation, it definitely does not have the aberration, if I open it on my phone. I tried different scaling on my desktop, did not change anything. I'm still lost..

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        #4
        The purple/black color is supposed to be there; it's how they colored this wallpaper.

        Same wallpaper on my 18.10 system:
        Click image for larger version

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        Last edited by Snowhog; Feb 01, 2019, 02:09 PM.
        Windows no longer obstructs my view.
        Using Kubuntu Linux since March 23, 2007.
        "It is a capital mistake to theorize before one has data." - Sherlock Holmes

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          #5
          Ah crap, looking at the thread with my phone I realise the screenshots don't show the problem, so now I tried to photograph it with my phone. The colour transitions are not smooth, there are some weird curves in the wall paper, and the youtube frame has some strange red-ish patches. Since the screenshots don't show it, it's something with the graphics card or the screen panel I guess?!?



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            #6
            just to be safe, check your cable and the connection at both ends. I had an odd problem with greens mostly in video games but also in other places, seemingly only when using Nvidia drivers. It turned out to be that my HDMI cable was not 100% seated due to the size of the plug and the position of the socket on the card on the small form factor PC. It was about 99%.

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              #7
              Today I booted and the color distortion has suddenly disappeared. I did not do anything to cable since it is an All-In-One-PC and the connections are not accessible. Makes me believe even more it is (was) an hardware issue.
              Thanks anyway for the help guys!

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                #8
                Now I disassembled the machine to check whether I can upgrade the CPU, and it looks like indeed the latch that secures the cable going was not closed correctly. I expect this was the main cause.

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                  #9
                  Cable connections are subject to working loose due to the heating and cooling stresses experienced during on/off cycles. Easier to inspect and remedy in a desktop rig than a laptop!
                  Windows no longer obstructs my view.
                  Using Kubuntu Linux since March 23, 2007.
                  "It is a capital mistake to theorize before one has data." - Sherlock Holmes

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