Details
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Bug
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Resolution: Incomplete
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P1: Critical
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None
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5.7.0
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None
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Ubuntu 16.04
Description
Sometimes the examples below simply don't visibly respond to user input. If you put debug output in e.g. a MouseArea, it will print that it has received the events, but the UI does not reflect this.
The application is the only Qt Quick application running (that I'm aware of). Other applications that I'm running:
- Chrome
- File explorer
- Quassel
- Qt Creator (with -noload Welcome)
I've attached the output of top -n 1 -b in top.txt.
See the attached ubuntu-qtquick-unresponsive.mp4 for the following example.
import QtQuick 2.6 import QtQuick.Window 2.0 Window { width: 400 height: 400 visible: true Shortcut { sequence: "Ctrl+Q" onActivated: Qt.quit() } ListView { width: 200 height: 200 clip: true anchors.centerIn: parent model: 10 delegate: Text { text: "Hello" } } }
See the attached ubuntu-qtquick-unresponsive-mousearea.mp4 for the following example.
import QtQuick 2.6 import QtQuick.Window 2.0 Window { x: 0 y: 0 width: 400 height: 400 visible: true Shortcut { sequence: "Ctrl+Q" onActivated: Qt.quit() } ListView { width: 200 height: 200 clip: true anchors.centerIn: parent model: 10 delegate: MouseArea { width: 200 height: 50 onPressed: print("pressed") Rectangle { anchors.fill: parent color: "transparent" border.color: "darkorange" } } } }
When run with QSG_INFO:
Starting /tmp/untitled1-qt5_7_debug-Debug/untitled1... QML debugging is enabled. Only use this in a safe environment. qt.scenegraph.general: QSG: basic render loop qt.scenegraph.general: texture atlas dimensions: 512x512 qt.scenegraph.general: R/G/B/A Buffers: 8 8 8 0 qt.scenegraph.general: Depth Buffer: 24 qt.scenegraph.general: Stencil Buffer: 8 qt.scenegraph.general: Samples: -1 qt.scenegraph.general: GL_VENDOR: Intel Open Source Technology Center qt.scenegraph.general: GL_RENDERER: Mesa DRI Intel(R) Haswell Desktop qt.scenegraph.general: GL_VERSION: 3.0 Mesa 11.2.0 qt.scenegraph.general: GL_EXTENSIONS: GL_APPLE_object_purgeable GL_S3_s3tc GL_ARB_texture_mirror_clamp_to_edge GL_EXT_secondary_color GL_EXT_multi_draw_arrays GL_SGIS_texture_border_clamp GL_ARB_vertex_attrib_binding GL_ANGLE_texture_compression_dxt5 GL_ANGLE_texture_compression_dxt3 GL_AMD_performance_monitor GL_EXT_texture_object GL_ARB_pixel_buffer_object GL_APPLE_packed_pixels GL_EXT_provoking_vertex GL_EXT_rescale_normal GL_ARB_robustness GL_ARB_depth_buffer_float GL_ARB_separate_shader_objects GL_ARB_blend_func_extended GL_ARB_vertex_shader GL_NV_primitive_restart GL_ARB_shader_objects GL_ARB_shader_storage_buffer_object GL_KHR_context_flush_control GL_ARB_debug_output GL_EXT_texture_lod_bias GL_ARB_pipeline_statistics_query GL_APPLE_vertex_array_object GL_ARB_multi_bind GL_ARB_seamless_cubemap_per_texture GL_ARB_texture_compression GL_EXT_framebuffer_object GL_ARB_sampler_objects GL_ARB_map_buffer_alignment GL_AMD_seamless_cubemap_per_texture GL_AMD_conservative_depth GL_EXT_texture3D GL_ARB_texture_mirrored_repeat GL_MESA_window_pos GL_ARB_depth_clamp GL_EXT_framebuffer_blit GL_AMD_draw_buffers_blend GL_ARB_texture_cube_map GL_ARB_shader_texture_lod GL_EXT_gpu_program_parameters GL_ARB_shader_draw_parameters GL_ATI_separate_stencil GL_ARB_vertex_type_10f_11f_11f_rev GL_ARB_get_program_binary GL_EXT_transform_feedback GL_ARB_transform_feedback_instanced GL_EXT_blend_minmax GL_NV_depth_clamp GL_ARB_texture_storage_multisample GL_ARB_vertex_array_bgra GL_EXT_texture_env_dot3 GL_ARB_draw_instanced GL_ARB_transform_feedback3 GL_ARB_arrays_of_arrays GL_EXT_framebuffer_sRGB GL_ATI_texture_float GL_ATI_draw_buffers GL_EXT_blend_equation_separate GL_ARB_shader_bit_encoding GL_EXT_separate_specular_color GL_ARB_multisample GL_ARB_texture_query_lod GL_ARB_texture_compression_bptc GL_ARB_shading_language_420pack GL_ARB_texture_query_levels GL_ARB_fragment_program_shadow GL_MESA_texture_signed_rgba GL_ARB_texture_env_combine GL_ARB_point_parameters GL_ARB_provoking_vertex GL_EXT_blend_func_separate GL_NV_texture_barrier GL_EXT_framebuffer_multisample GL_ARB_half_float_pixel GL_ARB_texture_env_crossbar GL_EXT_texture_compression_dxt1 GL_EXT_packed_pixels GL_ARB_shading_language_100 GL_NV_packed_depth_stencil GL_EXT_texture_array GL_ATI_blend_equation_separate GL_3DFX_texture_compression_FXT1 GL_EXT_bgra GL_ARB_instanced_arrays GL_ARB_texture_swizzle GL_EXT_subtexture GL_ARB_map_buffer_range GL_ARB_texture_storage GL_ATI_texture_env_combine3 GL_ARB_program_interface_query GL_ARB_seamless_cube_map GL_ARB_fragment_coord_conventions GL_ARB_sync GL_ARB_point_sprite GL_EXT_abgr GL_ARB_shader_atomic_counters GL_ARB_shader_image_size GL_EXT_texture_shared_exponent GL_NV_texture_env_combine4 GL_ARB_shader_clock GL_EXT_texture_filter_anisotropic GL_ARB_occlusion_query2 GL_EXT_fog_coord GL_NV_conditional_render GL_EXT_shader_integer_mix GL_EXT_texture_compression_s3tc GL_ARB_vertex_buffer_object GL_ARB_texture_view GL_ARB_sample_shading GL_ARB_conditional_render_inverted GL_ARB_texture_env_dot3 GL_IBM_rasterpos_clip GL_EXT_shader_samples_identical GL_IBM_texture_mirrored_repeat GL_INGR_blend_func_separate GL_ARB_fragment_shader GL_EXT_shadow_funcs GL_ARB_vertex_type_2_10_10_10_rev GL_ARB_shader_texture_image_samples GL_EXT_texture_swizzle GL_ARB_half_float_vertex GL_ARB_vertex_program GL_EXT_blend_subtract GL_EXT_texture_cube_map GL_ARB_copy_image GL_NV_light_max_exponent GL_ARB_depth_texture GL_ARB_clip_control GL_ARB_draw_elements_base_vertex GL_EXT_polygon_offset_clamp GL_IBM_multimode_draw_arrays GL_EXT_blend_color GL_EXT_stencil_two_side GL_EXT_pixel_buffer_object GL_ARB_transpose_matrix GL_ARB_buffer_storage GL_ARB_texture_non_power_of_two GL_ARB_texture_multisample GL_ARB_window_pos GL_EXT_vertex_array_bgra GL_ARB_framebuffer_object GL_ARB_clear_texture GL_ARB_invalidate_subdata GL_EXT_copy_texture GL_ARB_uniform_buffer_object GL_ARB_get_texture_sub_image GL_ARB_shader_image_load_store GL_ARB_texture_rgb10_a2ui GL_ARB_multitexture GL_SGIS_texture_lod GL_ARB_occlusion_query GL_MESA_pack_invert GL_ARB_ES3_compatibility GL_ARB_texture_compression_rgtc GL_NV_blend_square GL_ARB_shading_language_packing GL_EXT_texture_sRGB GL_ARB_framebuffer_no_attachments GL_EXT_point_parameters GL_NV_texgen_reflection GL_EXT_vertex_array GL_EXT_draw_range_elements GL_EXT_packed_float GL_ARB_ES2_compatibility GL_EXT_packed_depth_stencil GL_OES_read_format GL_ARB_conservative_depth GL_EXT_texture_env_combine GL_EXT_timer_query GL_EXT_texture_integer GL_ARB_explicit_attrib_location GL_EXT_draw_instanced GL_EXT_polygon_offset GL_ARB_derivative_control GL_EXT_framebuffer_multisample_blit_scaled GL_EXT_texture_compression_rgtc GL_ARB_texture_barrier GL_NV_texture_rectangle GL_AMD_shader_trinary_minmax GL_ARB_draw_buffers GL_INTEL_performance_query GL_ARB_texture_rectangle GL_ARB_timer_query GL_ARB_explicit_uniform_location GL_ARB_color_buffer_float GL_ARB_draw_buffers_blend GL_ARB_internalformat_query GL_ARB_texture_rg GL_EXT_texture_rectangle GL_KHR_debug GL_ARB_clear_buffer_object GL_ARB_texture_float GL_EXT_compiled_vertex_array GL_ARB_texture_env_add GL_SGIS_generate_mipmap GL_ARB_shadow GL_ARB_framebuffer_sRGB GL_ARB_vertex_array_object GL_OES_EGL_image GL_SUN_multi_draw_arrays GL_EXT_texture_env_add GL_ARB_compressed_texture_pixel_storage GL_SGIS_texture_edge_clamp GL_ARB_texture_border_clamp GL_EXT_draw_buffers2 GL_ARB_texture_cube_map_array GL_ARB_copy_buffer GL_EXT_stencil_wrap GL_EXT_texture GL_ARB_texture_gather GL_EXT_texture_sRGB_decode GL_ARB_transform_feedback2 GL_EXT_texture_snorm GL_ARB_fragment_program GL_EXT_texture_edge_clamp qt.scenegraph.general: Max Texture Size: 8192 qt.scenegraph.general: Debug context: false