flutter-pi cannot determine the screen resolution

[james-bay]

Hello! I tried to run flutter_gallery as written in the README, but encountered a problem. The flutter-pi cannot detect the screen resolution:

flutter-pi --release /home/pi/flutter_gallery
[modesetting] Could not set DRM client universal planes capable. drmSetClientCap: Operation not supported
[flutter-pi] Could not create drmdev from device at "/dev/dri/card1". Continuing.
[flutter-pi] WARNING: display didn't provide valid physical dimensions.
             The device-pixel ratio will default to 1.0, which may not be the fitting device-pixel ratio for your display.
WARNING: Kernel didn't return a valid vblank timestamp. (timestamp == 0)
         VSync will be disabled.
         See https://github.com/ardera/flutter-pi/issues/38 for more info.
===================================
display mode:
  resolution: 1920 x 1080
  refresh rate: 60Hz
  physical size: 0mm x 0mm
  flutter device pixel ratio: 1.000000
===================================
EGL information:
  version: 1.4
  vendor: "Mesa Project"
  client extensions: "EGL_EXT_device_base EGL_EXT_device_enumeration EGL_EXT_device_query EGL_EXT_platform_base EGL_KHR_client_get_all_proc_addresses EGL_EXT_client_extensions EGL_KHR_debug EGL_EXT_platform_wayland EGL_EXT_platform_x11 EGL_MESA_platform_gbm EGL_MESA_platform_surfaceless EGL_EXT_platform_device"
  display extensions: "EGL_ANDROID_blob_cache EGL_EXT_buffer_age EGL_EXT_image_dma_buf_import EGL_EXT_image_dma_buf_import_modifiers EGL_KHR_cl_event2 EGL_KHR_config_attribs EGL_KHR_create_context EGL_KHR_create_context_no_error EGL_KHR_fence_sync EGL_KHR_get_all_proc_addresses EGL_KHR_gl_colorspace EGL_KHR_gl_renderbuffer_image EGL_KHR_gl_texture_2D_image EGL_KHR_gl_texture_3D_image EGL_KHR_gl_texture_cubemap_image EGL_KHR_image EGL_KHR_image_base EGL_KHR_image_pixmap EGL_KHR_no_config_context EGL_KHR_reusable_sync EGL_KHR_surfaceless_context EGL_EXT_pixel_format_float EGL_KHR_wait_sync EGL_MESA_configless_context EGL_MESA_drm_image EGL_MESA_image_dma_buf_export EGL_MESA_query_driver EGL_WL_bind_wayland_display "
===================================
OpenGL ES information:
  version: "OpenGL ES 3.1 Mesa 19.3.2"
  shading language version: "OpenGL ES GLSL ES 3.10"
  vendor: "Broadcom"
  renderer: "V3D 4.2"
  extensions: "GL_EXT_blend_minmax GL_EXT_multi_draw_arrays GL_EXT_texture_format_BGRA8888 GL_OES_compressed_ETC1_RGB8_texture GL_OES_depth24 GL_OES_element_index_uint GL_OES_fbo_render_mipmap GL_OES_mapbuffer GL_OES_rgb8_rgba8 GL_OES_standard_derivatives GL_OES_stencil8 GL_OES_texture_3D GL_OES_texture_float GL_OES_texture_half_float GL_OES_texture_half_float_linear GL_OES_texture_npot GL_OES_vertex_half_float GL_EXT_texture_sRGB_decode GL_OES_EGL_image GL_OES_depth_texture GL_OES_packed_depth_stencil GL_EXT_texture_type_2_10_10_10_REV GL_OES_get_program_binary GL_APPLE_texture_max_level GL_EXT_discard_framebuffer GL_EXT_read_format_bgra GL_EXT_frag_depth GL_NV_fbo_color_attachments GL_OES_EGL_image_external GL_OES_EGL_sync GL_OES_vertex_array_object GL_EXT_occlusion_query_boolean GL_EXT_texture_rg GL_EXT_unpack_subimage GL_NV_draw_buffers GL_NV_read_buffer GL_NV_read_depth GL_NV_read_depth_stencil GL_NV_read_stencil GL_EXT_draw_buffers GL_EXT_map_buffer_range GL_KHR_debug GL_KHR_texture_compression_astc_ldr GL_OES_depth_texture_cube_map GL_OES_required_internalformat GL_OES_surfaceless_context GL_EXT_color_buffer_float GL_EXT_sRGB_write_control GL_EXT_separate_shader_objects GL_EXT_shader_implicit_conversions GL_EXT_shader_integer_mix GL_EXT_base_instance GL_EXT_compressed_ETC1_RGB8_sub_texture GL_EXT_draw_elements_base_vertex GL_EXT_primitive_bounding_box GL_EXT_shader_io_blocks GL_EXT_texture_border_clamp GL_EXT_texture_norm16 GL_KHR_context_flush_control GL_NV_image_formats GL_OES_draw_elements_base_vertex GL_OES_primitive_bounding_box GL_OES_shader_io_blocks GL_OES_texture_border_clamp GL_OES_texture_stencil8 GL_OES_texture_storage_multisample_2d_array GL_EXT_buffer_storage GL_EXT_float_blend GL_KHR_no_error GL_KHR_texture_compression_astc_sliced_3d GL_OES_EGL_image_external_essl3 GL_OES_shader_image_atomic GL_MESA_shader_integer_functions GL_KHR_parallel_shader_compile GL_MESA_framebuffer_flip_y GL_EXT_texture_query_lod "
===================================

The config.txt for the screen has these settings:

# Chalk Screen
hdmi_force_hotplug=1
hdmi_ignore_edid=0xa5000080
config_hdmi_boost=4
hdmi_group=2
hdmi_mode=28
gpu_mem=64

The physical resolution of the screen is 1280x800 and so hdmi_mode=28 is the correct value. Can you tell me, please, how else can I try to set the resolution?

[ardera]

can you try with hdmi_force_mode=1?

also make sure you've connected the monitor to HDMI port 0 since the hdmi options by default apply to port 0 only. (for example, use hdmi_force_hotplug:1=1 to apply an option to HDMI port 1 instead)

[james-bay]

I tried hdmi_force_mode=1 but the resolution is not detected.
I connected the screen to port 0 and made these configurations in config.txt:

# Chalk Screen
hdmi_force_hotplug=0
hdmi_force_mode=1
hdmi_ignore_edid=0xa5000080
config_hdmi_boost=4
hdmi_group=2
hdmi_mode=28
gpu_mem=64

That didn't work either

The edid has the following data:

~ $ cat /sys/devices/platform/gpu/drm/card1/card1-HDMI-A-1/edid  | edid-decode 
EDID version: 1.3
Manufacturer: SAM Model 5b0 Serial Number 0
Made in week 13 of 2009
Digital display
Maximum image size: 16 cm x 9 cm
Gamma: 2.20
RGB color display
First detailed timing is preferred timing
Display x,y Chromaticity:
  Red:   0.6396, 0.3300
  Green: 0.2998, 0.5996
  Blue:  0.1503, 0.0595
  White: 0.3125, 0.3291
Established timings supported:
  720x400@70Hz 9:5 HorFreq: 31469 Hz Clock: 28.320 MHz
  640x480@60Hz 4:3 HorFreq: 31469 Hz Clock: 25.175 MHz
  640x480@67Hz 4:3 HorFreq: 35000 Hz Clock: 30.240 MHz
  640x480@72Hz 4:3 HorFreq: 37900 Hz Clock: 31.500 MHz
  640x480@75Hz 4:3 HorFreq: 37500 Hz Clock: 31.500 MHz
  800x600@56Hz 4:3 HorFreq: 35200 Hz Clock: 36.000 MHz
  800x600@60Hz 4:3 HorFreq: 37900 Hz Clock: 40.000 MHz
  800x600@72Hz 4:3 HorFreq: 48100 Hz Clock: 50.000 MHz
  800x600@75Hz 4:3 HorFreq: 46900 Hz Clock: 49.500 MHz
  832x624@75Hz 4:3 HorFreq: 49726 Hz Clock: 57.284 MHz
  1024x768@60Hz 4:3 HorFreq: 48400 Hz Clock: 65.000 MHz
  1024x768@70Hz 4:3 HorFreq: 56500 Hz Clock: 75.000 MHz
  1024x768@75Hz 4:3 HorFreq: 60000 Hz Clock: 78.750 MHz
  1280x1024@75Hz 5:4 HorFreq: 80000 Hz Clock: 135.000 MHz
  1152x870@75Hz 192:145 HorFreq: 67500 Hz Clock: 108.000 MHz
Standard timings supported:
  1152x864@75Hz 4:3 HorFreq: 67500 Hz Clock: 108.000 MHz
  1280x800@60Hz 16:10
  1280x960@60Hz 4:3 HorFreq: 60000 Hz Clock: 108.000 MHz
  1280x1024@60Hz 5:4 HorFreq: 64000 Hz Clock: 108.000 MHz
  1440x900@60Hz 16:10 HorFreq: 55500 Hz Clock: 88.750 MHz
  1440x900@75Hz 16:10 HorFreq: 82300 Hz Clock: 156.000 MHz
  1600x1200@60Hz 4:3 HorFreq: 75000 Hz Clock: 162.000 MHz
  1680x1050@60Hz 16:10 HorFreq: 64700 Hz Clock: 119.000 MHz
Detailed mode: Clock 148.500 MHz, 160 mm x 90 mm
               1920 2008 2052 2200 hborder 0
               1080 1084 1089 1125 vborder 0
               +hsync +vsync 
               VertFreq: 60 Hz, HorFreq: 67500 Hz
Detailed mode: Clock 74.250 MHz, 160 mm x 90 mm
               1280 1720 1760 1980 hborder 0
                720  725  730  750 vborder 0
               +hsync +vsync 
               VertFreq: 50 Hz, HorFreq: 37500 Hz
Monitor ranges (GTF): 24-75Hz V, 26-81kHz H, max dotclock 230MHz
Monitor name: SyncMaster
Has 1 extension blocks
Checksum: 0xd1 (valid)

CTA extension block
Extension version: 3
31 bytes of CTA data
  Video data block
    VIC  19 1280x720@50Hz 16:9 (native) HorFreq: 37500 Hz Clock: 74.250 MHz
    VIC   4 1280x720@60Hz 16:9  HorFreq: 45000 Hz Clock: 74.250 MHz
    VIC   5 1920x1080i@60Hz 16:9  HorFreq: 33750 Hz Clock: 74.250 MHz
    VIC  20 1920x1080i@50Hz 16:9  HorFreq: 28125 Hz Clock: 74.250 MHz
    VIC   3 720x480@60Hz 16:9  HorFreq: 31469 Hz Clock: 27.000 MHz
    VIC  18 720x576@50Hz 16:9  HorFreq: 31250 Hz Clock: 27.000 MHz
    VIC  16 1920x1080@60Hz 16:9  HorFreq: 67500 Hz Clock: 148.500 MHz
    VIC  31 1920x1080@50Hz 16:9  HorFreq: 56250 Hz Clock: 148.500 MHz
    VIC  32 1920x1080@24Hz 16:9  HorFreq: 27000 Hz Clock: 74.250 MHz
    VIC  33 1920x1080@25Hz 16:9  HorFreq: 28125 Hz Clock: 74.250 MHz
    VIC  34 1920x1080@30Hz 16:9  HorFreq: 33750 Hz Clock: 74.250 MHz
  Audio data block
    Linear PCM, max channels 2
      Supported sample rates (kHz): 48 44.1 32
      Supported sample sizes (bits): 24 20 16
  Speaker allocation data block
    Speaker map:
      FL/FR - Front Left/Right
  Extended tag: Video capability data block
    YCbCr quantization: No Data (0)
    RGB quantization: No Data (0)
    PT scan behaviour: No Data (0)
    IT scan behaviour: Support both over- and underscan (3)
    CE scan behaviour: Support both over- and underscan (3)
  Vendor-specific data block, OUI 000c03 (HDMI)
    Source physical address 1.0.0.0
    Supports_AI
    DC_36bit
    DC_30bit
    DC_Y444
    Maximum TMDS clock: 225MHz
Underscans PC formats by default
Basic audio support
Supports YCbCr 4:4:4
Supports YCbCr 4:2:2
1 native detailed modes
Detailed mode: Clock 74.250 MHz, 160 mm x 90 mm
               1920 2448 2492 2640 hborder 0
                540  542  547  562 vborder 0
               +hsync +vsync interlaced 
               VertFreq: 50 Hz, HorFreq: 28125 Hz
Detailed mode: Clock 74.250 MHz, 160 mm x 90 mm
               1920 2008 2052 2200 hborder 0
                540  542  547  562 vborder 0
               +hsync +vsync interlaced 
               VertFreq: 60 Hz, HorFreq: 33750 Hz
Detailed mode: Clock 74.250 MHz, 160 mm x 90 mm
               1280 1390 1430 1650 hborder 0
                720  725  730  750 vborder 0
               +hsync +vsync 
               VertFreq: 60 Hz, HorFreq: 45000 Hz
Detailed mode: Clock 27.000 MHz, 160 mm x 90 mm
                720  732  796  864 hborder 0
                576  581  586  625 vborder 0
               -hsync -vsync 
               VertFreq: 50 Hz, HorFreq: 31250 Hz
Detailed mode: Clock 27.000 MHz, 160 mm x 90 mm
                720  736  798  858 hborder 0
                480  489  495  525 vborder 0
               -hsync -vsync 
               VertFreq: 59 Hz, HorFreq: 31468 Hz
Checksum: 0x57 (valid)

[ardera]

Mh that's weird. flutter-pi just uses the video mode recommended by the kernel (there should always be exactly one video mode recommended by the kernel), and if that's not the case (even though that should never happen) it'll use the one with the highest resolution, highest refresh-rate, non-interlaced, which seems to be whats going on in your case. What happens when you run without the hdmi_ignore_edid option? (I guess you tried that already, but still)

Theoretically you could hardcode the resolution in the flutter-pi.c file, but in the long term it's probably better I provide cmdline options for forcing a specific video mode.