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    recalbox not work well with DPI LCD on 4B

    Recalbox General
    recalbox dpi lcd
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    • DRAgon734235
      DRAgon734235 last edited by

      I use a DPI LCD work well at 3B , but when I use the latest recalbox on 4B

      the DPI LCD just can display recalbox logo and stay on that picture

      can not enter Emulator and can not start the game

      the DPI LCD need some configuration at recalbox on 4B ??

      Zing 1 Reply Last reply Reply Quote 0
      • DRAgon734235
        DRAgon734235 last edited by DRAgon734235

        other question

        I find a problem, recalbox with HDMI LCD on 4B,

        have a problem that the LCD can not rotate 90 degree .

        have some method rotate the LCD on 4B ?

        1 Reply Last reply Reply Quote 0
        • Zing
          Zing Global moderator Translator @DRAgon734235 last edited by Zing

          @DRAgon734235

          LCD

          https://recalbox.gitbook.io/documentation/tutorials/video/lcd/connecting-your-recalbox-to-a-dvi-monitor

          rotate the LCD

          https://recalbox.gitbook.io/documentation/advanced-user/configuration/configuration-overload/retroarch-overloads#screen-rotation

          Se a minha resposta foi útil, por favor, dê um voto positivo, clicando na seta para cima logo abaixo da resposta, ao lado de "citar".
          If my answer was helpful, please give a positive feedback by clicking the up arrow below the answer, next to "quote".

          DRAgon734235 2 Replies Last reply Reply Quote 0
          • DRAgon734235
            DRAgon734235 @Zing last edited by

            @Zing

            dtoverlay=dpi18
            enable_dpi_lcd=1
            display_default_lcd=1
            #dpi_group=2
            dpi_mode=87
            dpi_output_format=0x7f216
            hdmi_timings=480 0 10 16 59 800 0 15 113 15 0 0 0 60 0 52000000 6
            

            this is my configuration at config.txt

            stay at recalbox logo not caused by “hdmi_drive=2”

            Zing 1 Reply Last reply Reply Quote 0
            • DRAgon734235
              DRAgon734235 @Zing last edited by

              @Zing

              if I use HDMI LCD . the same image with HDMI configuration will work well

              1 Reply Last reply Reply Quote 0
              • Zing
                Zing Global moderator Translator @DRAgon734235 last edited by

                @DRAgon734235 I just realized that you are referring to a DPI screen, and I was thinking it was a DVI screen, sorry for the mistake.

                I just realized that you are referring to a DPI screen, and I was thinking it was a DVI screen, sorry for the mistake.

                You need to read these tutorials:

                • https://recalbox.gitbook.io/documentation/tutorials/video/display-configuration/complete-guide-on-video-configuration

                • https://recalbox.gitbook.io/documentation/tutorials/video/tft/setting-up-your-small-tft-screen-on-the-dpi-bus

                • https://recalbox.gitbook.io/documentation/tutorials/video/display-configuration/adjusting-the-image-size-using-overscan

                Se a minha resposta foi útil, por favor, dê um voto positivo, clicando na seta para cima logo abaixo da resposta, ao lado de "citar".
                If my answer was helpful, please give a positive feedback by clicking the up arrow below the answer, next to "quote".

                DRAgon734235 2 Replies Last reply Reply Quote 0
                • DRAgon734235
                  DRAgon734235 @Zing last edited by

                  @Zing

                  hello, thank for your replay, I think that three wenlink just work for 3B , Not 4B

                  Now I am the 4B DPI problem, at 3B , the DPI LCD display well 。

                  I have tried this weblink
                  https://recalbox.gitbook.io/documentation/tutorials/video/tft/setting-up-your-small-tft-screen-on-the-spi-bus
                  That just work for 3B , not work for 4B ,

                  also tryed this
                  https://recalbox.gitbook.io/documentation/tutorials/video/tft/second-minitft-for-scrapes-and-videos-ogst-case-raspeberry-pi-1-2-3-spi-dpi-small-tft-screens
                  add the code

                  system.secondminitft.enabled=1
                  

                  this code not have any effect

                  ==================================================
                  This is my problem, the DPI lcd work well at 3B , not work well at 4B
                  your weblink for reference just for 3B not solve 4B problem

                  1 Reply Last reply Reply Quote 0
                  • ian57
                    ian57 Staff last edited by

                    @DRAgon734235 that's srtrange but it may comes from the Pi4 3D Accel. Try to comment out the 3D acceleration for pi4 to fall back in Pi3-like running.
                    With Pi4 3D accel, only 180° rotation is allowed in framebuffer, 90 and 270 do not work

                    You need to comment

                    #dtoverlay=vc4-kms-v3d
                    

                    in /boot/config.txt
                    After you should able to rotate the display as in your Pi3 config.

                    "UNIX is basically a simple operating system, but you have to be a genius to understand the simplicity." Dennis Ritchie

                    DRAgon734235 1 Reply Last reply Reply Quote 0
                    • DRAgon734235
                      DRAgon734235 @Zing last edited by

                      @Zing
                      DPI LCD same configuration 3B work well

                      But 4B just stay at this recalbox logo image
                      alt text

                      1 Reply Last reply Reply Quote 0
                      • DRAgon734235
                        DRAgon734235 @ian57 last edited by

                        @ian57 said in recalbox not work well with DPI LCD on 4B:

                        #dtoverlay=vc4-kms-v3d

                        After comment
                        #dtoverlay=vc4-kms-v3d

                        Still stay at recalbox logo image

                        ian57 1 Reply Last reply Reply Quote 0
                        • ian57
                          ian57 Staff @DRAgon734235 last edited by ian57

                          @DRAgon734235 seems that Emulationstation does not like unaccelerated Pi4 config.

                          When I'll have some time will check on my geekworm dpi screen

                          "UNIX is basically a simple operating system, but you have to be a genius to understand the simplicity." Dennis Ritchie

                          DRAgon734235 1 Reply Last reply Reply Quote 0
                          • DRAgon734235
                            DRAgon734235 @ian57 last edited by

                            @ian57 said in recalbox not work well with DPI LCD on 4B:

                            geekworm

                            OK ,

                            think you

                            1 Reply Last reply Reply Quote 0
                            • DRAgon734235
                              DRAgon734235 last edited by

                              @ian57 @Zing

                              have news ?

                              ian57 1 Reply Last reply Reply Quote 0
                              • ian57
                                ian57 Staff @DRAgon734235 last edited by

                                @DRAgon734235 Hi,

                                It works well... but no rotation 90/270° available from the firmware and the overlay... the fondation doc DOES NOT work!

                                perhaps a lead.. i read something about that the kernel 5.10 supports all rotation from the accelerated overlay... so we need to b*mp to test...

                                As a sum up ... All the screen are working with acceleration but no 90° 270° actually
                                only 180°

                                "UNIX is basically a simple operating system, but you have to be a genius to understand the simplicity." Dennis Ritchie

                                1 Reply Last reply Reply Quote 0
                                • DRAgon734235
                                  DRAgon734235 last edited by

                                  my 4b stay at this
                                  alt text

                                  Do you have any suggestion ? (Even in “rotate=0” )

                                  1 Reply Last reply Reply Quote 0
                                  • DRAgon734235
                                    DRAgon734235 last edited by

                                    @ian57
                                    Do you have any suggestion ?

                                    ian57 1 Reply Last reply Reply Quote 0
                                    • ian57
                                      ian57 Staff @DRAgon734235 last edited by

                                      @DRAgon734235 hdmi or dpi ?
                                      which screen ?

                                      "UNIX is basically a simple operating system, but you have to be a genius to understand the simplicity." Dennis Ritchie

                                      1 Reply Last reply Reply Quote 0
                                      • DRAgon734235
                                        DRAgon734235 last edited by

                                        @ian57
                                        https://www.aliexpress.com/item/1005001659074233.html?spm=a2g0o.productlist.0.0.9cc286b4PDloaM&algo_pvid=05efcf4a-b64c-4624-b3b0-7450fe193177&algo_expid=05efcf4a-b64c-4624-b3b0-7450fe193177-13&btsid=0b86d81616125235002752171e1e1f&ws_ab_test=searchweb0_0,searchweb201602_,searchweb201603_

                                        Waveshare 2.8inch dpi LCD

                                        ian57 1 Reply Last reply Reply Quote 0
                                        • ian57
                                          ian57 Staff @DRAgon734235 last edited by

                                          @DRAgon734235 this screen has 480x640 resolution so you need to rotate it (90 or 270). Actually it seems not to be supported in frambuffer, only with xrandr in GUI. I saw this https://www.raspberrypi.org/documentation/configuration/cmdline-txt.md and tried it but it only works with 0-180° not with 90-270.

                                          "UNIX is basically a simple operating system, but you have to be a genius to understand the simplicity." Dennis Ritchie

                                          1 Reply Last reply Reply Quote 0
                                          • DRAgon734235
                                            DRAgon734235 last edited by DRAgon734235

                                            @ian57

                                            I do not rotate the LCD with 90 or 270, the LCD display as the default direction like this image

                                            alt text

                                            and the recalbox stay at this picture always

                                            ian57 1 Reply Last reply Reply Quote 0
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