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    Good news regarding tearing and low EmulationStation performance on Pi 4

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    General Discussion and Gaming
    performance vsync pi 4 kernel 5.4
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    • Beretta9B
      Beretta9
      last edited by

      I'm in the same situation. I can get the KMS driver to work but cannot get audio.

      Retro Gamer Supreme

      RascasR 1 Reply Last reply Reply Quote 0
      • RascasR
        Rascas @Beretta9
        last edited by

        Kernel 5.4 is still in testing and KMS isn't ready yet so issues may occur. For more information about it's current state check this thread:
        https://www.raspberrypi.org/forums/viewtopic.php?f=29&t=269769

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        • B
          bluestang @akamming
          last edited by

          @akamming said in Good news regarding tearing and low EmulationStation performance on Pi 4:

          @cellux said in Good news regarding tearing and low EmulationStation performance on Pi 4:

          I got a nice tip though. It is possible to use the old sound driver:
          dtparam=audio=on
          dtoverlay=vc4-kms-v3d-pi4,audio=off
          (and the old vc4-hdmi.conf)

          Dit you get this to work? i cannot get audio (also not with this tip)

          I only see the BCM2835 headphones driver, but i need either the 2835 HDMI 1 driver to work or the new kms audio driver. Can't get both to work...

          I tried

          • dtoverlay=vc4-kms-v3d-pi4,audio=off (with dtparam=audio=on and old vc4-hdmi.conf)
          • and dtoverlay=vc4-kms-v3d-pi4 with new vc4-hdmi.conf

          on both no audio. Does anyone have a tip?

          It is not possible to use the BCM2835 and the vc4hdmi drivers at the same time.
          What is your output when you type in aplay -l in the cmd line?

          A 1 Reply Last reply Reply Quote 0
          • S
            SeraphisCain
            last edited by SeraphisCain

            So I did a normal apt update today and apparently we're officially on 5.4 now? Using the KMS driver and new audio driver and everything seems to be working as intended, save for a "failed to find mixer elements" error with ES that's probably related to the new audio driver, but that's not much of a problem.

            EDIT: Hm, maybe it's not working quite as intended after all. I'm getting audio dropouts on more demanding stuff (Dreamcast with Redream, some games that require MAME 2016) using the new audio driver). Think I'll go back to FKMS/old audio driver until the new stuff has been tested a bit more.

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            • B
              bluestang @SeraphisCain
              last edited by

              @SeraphisCain said in Good news regarding tearing and low EmulationStation performance on Pi 4:

              So I did a normal apt update today and apparently we're officially on 5.4 now? Using the KMS driver and new audio driver and everything seems to be working as intended, save for a "failed to find mixer elements" error with ES that's probably related to the new audio driver, but that's not much of a problem.

              EDIT: Hm, maybe it's not working quite as intended after all. I'm getting audio dropouts on more demanding stuff (Dreamcast with Redream, some games that require MAME 2016) using the new audio driver). Think I'll go back to FKMS/old audio driver until the new stuff has been tested a bit more.

              I just confirmed this as well about the kernel update.

              So in order to use the vc4hdmi audio driver, you need to disable the broadcom2835 one in your config.txt

              Using both is not possible, or at least that is what was mentioned before. It was said that both drivers are fighting for the same resources hence why one of them needs to be disabled.

              The vc4hdmi audio driver is a WIP, so results will vary.

              Also, for the vc4hdmi driver you need to use an updated vc4hdmi.conf in the /usr/share/alsa/cards folder:

              https://github.com/LibreELEC/LibreELEC.tv/blob/master/projects/RPi/filesystem/usr/share/alsa/cards/vc4-hdmi.conf

              I am surprised that this file was not replaced with the new one with the kernel update.

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              • S
                SeraphisCain
                last edited by SeraphisCain

                For the moment I'm using dtoverlay=vc4-kms-v3d,noaudio along with dtparam=audio=on to use the new video driver along with the old audio driver until things get ironed out with the new HDMI audio driver.

                B 1 Reply Last reply Reply Quote 0
                • B
                  bluestang @SeraphisCain
                  last edited by bluestang

                  @SeraphisCain said in Good news regarding tearing and low EmulationStation performance on Pi 4:

                  For the moment I'm using dtoverlay=vc4-kms-v3d,noaudio along with dtparam=audio=on to use the new video driver along with the old audio driver until things get ironed out with the new HDMI audio driver.

                  The correct usage is dtoverlay=vc4-kms-v3d,noaudio=on

                  You can verify by typing aplay -l in the cmdline and the vc4hdmi devices will not be present.

                  S 1 Reply Last reply Reply Quote 0
                  • S
                    SeraphisCain @bluestang
                    last edited by

                    @bluestang

                    According to this:

                    https://github.com/raspberrypi/linux/pull/3640#issuecomment-639053905

                    noaudio and noaudio=on should have the same effect, since "on" is assumed if no parameter is given.

                    B 1 Reply Last reply Reply Quote 0
                    • B
                      bluestang @SeraphisCain
                      last edited by

                      @SeraphisCain said in Good news regarding tearing and low EmulationStation performance on Pi 4:

                      issuecomment

                      Good catch. I haven’t used the driver in awhile. For me the lack of a mixer doesn’t make it a suitable driver.

                      DarksaviorD 1 Reply Last reply Reply Quote 0
                      • DarksaviorD
                        Darksavior @bluestang
                        last edited by Darksavior

                        Yep, looks like they officially released 5.4 and the gamecon driver still doesn't work. I have no idea what the problem is but I did post the problem to them months ago in their forum and got ignored.

                        1 Reply Last reply Reply Quote 0
                        • mituM
                          mitu Global Moderator
                          last edited by

                          @Darksavior said in Good news regarding tearing and low EmulationStation performance on Pi 4:

                          I have no idea what the problem is but I did post the problem to them months ago in their forum and got ignored.

                          Well, it's not their driver - why would you expect them to fix it ?
                          You should have reported this upstream - https://github.com/marqs85/gamecon_gpio_rpi.

                          DarksaviorD 1 Reply Last reply Reply Quote 0
                          • DarksaviorD
                            Darksavior @mitu
                            last edited by

                            @mitu Well, I don't know of these things. A simple "not our problem" would've done it.
                            Buzz always tells people to post problems on the forum first, so I'm always hesitant to post problems at the github.

                            1 Reply Last reply Reply Quote 1
                            • mituM
                              mitu Global Moderator
                              last edited by

                              @Darksavior said in Good news regarding tearing and low EmulationStation performance on Pi 4:

                              Buzz always tells people to post problems on the forum first, so I'm always hesitant to post problems at the github.

                              Yes, that's the preferred approach - though in this case it's not a RetroPie issue. It looks like the module uses a call to do_gettimeofday, which was deprecated in the Linux kernel in preparation for the 2038-pocalypse. I'll take a look at what changes might be needed and perhaps submit a patch upstream.

                              1 Reply Last reply Reply Quote 1
                              • P
                                PhoenixJedi
                                last edited by

                                Well now that 5.4 is official, is there any way to get kodi working with this KMS driver or no?

                                saccublendaS RascasR 2 Replies Last reply Reply Quote 0
                                • saccublendaS
                                  saccublenda @PhoenixJedi
                                  last edited by

                                  @PhoenixJedi I think we just have to wait for Kodi 19 to be released.

                                  1 Reply Last reply Reply Quote 0
                                  • RascasR
                                    Rascas @PhoenixJedi
                                    last edited by

                                    @PhoenixJedi Nope, Kodi will only work with KMS in Kodi 19.

                                    1 Reply Last reply Reply Quote 0
                                    • Beretta9B
                                      Beretta9
                                      last edited by Beretta9

                                      Now that the update is official, is the KMS driver enabled by default, or do you still have to add the line in the boot config? Is the audio fixed with the KMS driver?

                                      Retro Gamer Supreme

                                      B 1 Reply Last reply Reply Quote 0
                                      • B
                                        bluestang @Beretta9
                                        last edited by

                                        @Beretta9 said in Good news regarding tearing and low EmulationStation performance on Pi 4:

                                        Now that the update is official, is the KMS driver enabled by default, or do you still have to add the line in the boot config? Is the audio fixed with the KMS driver?

                                        Not enabled by default, and the KMS driver is very much still a WIP.

                                        1 Reply Last reply Reply Quote 2
                                        • A
                                          akamming @bluestang
                                          last edited by

                                          @bluestang said in Good news regarding tearing and low EmulationStation performance on Pi 4:

                                          It is not possible to use the BCM2835 and the vc4hdmi drivers at the same time.

                                          That's why i think i got this tip: dtoverlay=vc4-kms-v3d-pi4,audio=off (with dtparam=audio=on and old vc4-hdmi.conf). But that indeed did not work

                                          What is your output when you type in aplay -l in the cmd line?

                                          i cannot check, i rolled back to the old kernel. Will try again in the near future

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                                          • B
                                            bluestang @akamming
                                            last edited by

                                            @akamming said in Good news regarding tearing and low EmulationStation performance on Pi 4:

                                            That's why i think i got this tip: dtoverlay=vc4-kms-v3d-pi4,audio=off (with dtparam=audio=on and old vc4-hdmi.conf). But that indeed did not work

                                            The usage is dtoverlay=vc4-kms-v3d,noaudio combined with dtparam=audio=on

                                            This turns off the vc4hdmi audio driver and keeps the BCM2835 audio driver on.

                                            If you want the vc4hmdi audio driver the usage is dtoverlay=vc4-kms-v3d and dtparam=audio=off

                                            You also need to replace the old vc4hdmi.conf file with this new one https://github.com/LibreELEC/LibreELEC.tv/blob/master/projects/RPi/filesystem/usr/share/alsa/cards/vc4-hdmi.conf

                                            I wouldn’t recommend this since this driver is very much a WIP and it lacks several features still.

                                            A 1 Reply Last reply Reply Quote 1
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