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    HDMI-2-VGA unable to set resolution

    Recalbox General
    hdmi-2-vga unable set resolution
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    • 0zzy
      0zzy last edited by

      Hi all, i'm going on with my bartop+recalbox project. I have found a dvi monitor so i have bought an hdmi2vga adapter and a vga2dvi adapter. I had to modify my /boot/config.txt becouse video after a few minutes started do loose monitor signal ang goes black This is my /boot/config.txt:

      # uncomment if you get no picture on HDMI for a default "safe" mode
      hdmi_safe=1
      
      disable_overscan=1
      
      # uncomment to force a specific HDMI mode (this will force VGA)
      hdmi_group=2
      hdmi_mode=51
      
      # comment to get jack audio
      hdmi_drive=2
      
      config_hdmi_boost=4
      hdmi_force_hotplug=1
      
      # uncomment for composite PAL
      #sdtv_mode=2
      
      # Overclock
      gpu_mem_256=128
      gpu_mem_512=256
      gpu_mem_1024=512
      
      avoid_safe_mode=1
      
      kernel=zImage
      
      # NOOBS Auto-generated Settings:
      hdmi_force_hotplug=1
      config_hdmi_boost=4
      overscan_left=24
      overscan_right=24
      overscan_top=16
      overscan_bottom=16
      disable_overscan=0
      arm_freq=1050
      core_freq=525
      sdram_freq=480
      force_turbo=0
      over_voltage=4
      over_voltage_sdram=2
      gpu_freq=350
      

      With this settings video is stable an monitor does not loose signal anymore. My tvservice output:

      Group CEA has 5 modes:
      mode 1: 640x480 @ 60Hz 4:3, clock:25MHz progressive
      mode 2: 720x480 @ 60Hz 4:3, clock:27MHz progressive
      mode 3: 720x480 @ 60Hz 16:9, clock:27MHz progressive
      (native) mode 4: 1280x720 @ 60Hz 16:9, clock:74MHz progressive
      mode 16: 1920x1080 @ 60Hz 16:9, clock:148MHz progressive
      
      Group DMT has 13 modes:
      (prefer) mode 4: 640x480 @ 60Hz 4:3, clock:25MHz progressive
      mode 6: 640x480 @ 75Hz 4:3, clock:31MHz progressive
      mode 7: 640x480 @ 85Hz 4:3, clock:36MHz progressive
      mode 9: 800x600 @ 60Hz 4:3, clock:40MHz progressive
      mode 12: 800x600 @ 85Hz 4:3, clock:56MHz progressive
      mode 16: 1024x768 @ 60Hz 4:3, clock:65MHz progressive
      mode 18: 1024x768 @ 75Hz 4:3, clock:78MHz progressive
      mode 19: 1024x768 @ 85Hz 4:3, clock:94MHz progressive
      mode 32: 1280x960 @ 60Hz 4:3, clock:108MHz progressive
      mode 35: 1280x1024 @ 60Hz 5:4, clock:108MHz progressive
      mode 36: 1280x1024 @ 75Hz 5:4, clock:135MHz progressive
      mode 37: 1280x1024 @ 85Hz 5:4, clock:157MHz progressive
      mode 51: 1600x1200 @ 60Hz 4:3, clock:162MHz progressive
      

      And my recalbox.conf

      # ------------ H - HERE IT IS - GLOBAL EMULATOR CONFIGURATION ------------ #
      ## The global value will be used for all emulators, exept if the value
      ## is redifined in the emulator
      
      ## Set game resolution for emulators
      ## select your mode from the command : tvservice -m [MODE]
      ## CEA 5 HDMI : 1920x1080 @ 60Hz 16:9, clock:74MHz interlaced 
      ## CEA 4 HDMI : 1280x720 @ 60Hz 16:9, clock:74MHz progressive
      ## use 'default' for using the default resolution
      ## (string)
      #global.videomode=CEA 4 HDMI
      global.videomode=DMT 51 HDMI
      

      As you can see i have tried to set resolution to 16001200 but no changes from the default 640480. Is it right to specify "global.videomode=DMT 51 HDMI" ? My second questions: if i run every emulator, black borders are present and the image is little bit streched, how can i set 4:3 on full screen?

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      • ironic
        ironic last edited by

        Is your monitor really 1600*1200 ? Try this : (config.txt) hdmi_group=2 hdmi_mode=35 hdmi_drive=2 config_hdmi_boost=0 hdmi_force_hotplug=0 gpu_mem_256=128 gpu_mem_512=256 gpu_mem_1024=512 avoid_safe_mode=1 kernel=zImage hdmi_force_hotplug=1 config_hdmi_boost=4 overscan_left=0 overscan_right=0 overscan_top=0 overscan_bottom=0 disable_overscan=1 And (recalbox.conf) ## global.videomode=CEA 4 HDMI global.videomode=DMT 35 HDMI

        Rpi2/Rpi3 - LCD/CRT- NES30 Pro-iBUFFALO

        1 Reply Last reply Reply Quote 0
        • 0zzy
          0zzy last edited by

          Hi ironic, yes my monitor HP LP2065 can work @ resolution of 1600x1200. I have found the problem, i must to enable hdmi_safe=1 on /boot/config.txt otherwise i'll get a black monitor = signal missing.

          Setting up hdmi_safe=1 is equal to set all this:
          hdmi_force_hotplug=1
          hdmi_ignore_edid=0xa5000080
          config_hdmi_boost=4
          hdmi_group=2
          hdmi_mode=4
          disable_overscan=0 
          

          and exactly the resolution i have is only @640x480 (hdmi_group=2 hdmi_mode=4). I have read this here: http://elinux.org/RPiconfig#Video_mode_options So..i have to let hdmi_safe=1, but if i try to specify other hdmi_mode (ex: 51) in boot.cfg and recalbox.conf, this is parameter is ignored, and i always have a resolution of @640x480

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          • 0zzy
            0zzy last edited by

            these are my monitor specs http://www8.hp.com/h20195/v2/getpdf.aspx/c04142050.pdf?ver=15 i have partially resolved in this way: hdmi_safe=0 hdmi_force_hotplug=1 hdmi_ignore_edid=0xa5000080 config_hdmi_boost=4 hdmi_group=2 hdmi_mode=35 disable_overscan=0 monitor signal is "stable", but i cant set hdmi_mode Greater than 35 otherwise monitor signal go up and down.. could it depends by my hdmi2vga converter?

            1 Reply Last reply Reply Quote 0
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