hudiy.eu • Dual Displays Touchscreen Issues

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Dual Displays Touchscreen Issues

Posted: Sat Oct 18, 2025 3:38 pm

by proteinklumpen

Hello,

I have a Raspberry Pi 5 Running Hudiy on

Linux hudiy 6.12.47+rpt-rpi-2712 #1 SMP PREEMPT Debian 1:6.12.47-1+rpt1~bookworm (2025-09-16) aarch64 GNU/Linux

I have two Waveshare 7" displays installed (https://www.waveshare.com/wiki/7inch_HDMI_LCD_(C)). One on top, one underneith. They have a resolution of 1024x600 each. So this is my main_configuration.json

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{
    "application" : {
        "handednessOfTraffic" : "LEFT",
        "defaultAction" : "",
        "showDashboardsIcon" : true,
        "showMenuIcon" : true,
        "touchscreen" : true,
        "showCursor" : true,
        "width" : 1024,
        "height" : 600,
        "x" : 0,
        "y" : 0,
        "splitWithProjections" : false,
        "windowWidth" : 1024,
        "windowHeight" : 1200,
        "handleKeyboardEvents" : true,
        "translationFile" : ""
    },
    "appearance" : {
        "timeFormat" : "24h",
        "showClock" : true,
        "fonts" : [

        ]
    },
    "theme" : {
        "darkThemeEnabled" : true,
        "darkContrastLevel" : 0,
        "darkSourceColor" : "#3AED6F",
        "lightContrastLevel" : 0,
        "lightSourceColor" : "#F78500",
        "availableColors" : [
            "#769CDF",
            "#862272",
            "#DADFBB",
            "#F78500",
            "#E1D648",
            "#3AED6F",
            "#E02129",
            "#4AD155"
        ],
        "lightBackgroundsMap" : {

        },
        "darkBackgroundsMap" : {

        },
        "defaultDarkBackground" : "",
        "defaultLightBackground" : "",
        "darkBackgroundOpacity" : 100,
        "lightBackgroundOpacity" : 100
    },
    "sound" : {
        "startupSoundFile" : "",
        "notificationSoundFile" : "",
        "volumeSinkName" : "",
        "playbackSinkName" : "hudiy_equalizer_sink",
        "sourceName" : "",
        "sourceMaxVolume" : 100,
        "sinkMaxVolume" : 100,
        "outputVolumeStep" : 5,
        "inputVolumeStep" : 5,
        "subwooferBalanceStep" : 5,
        "balanceStep" : 5,
        "fadeStep" : 5,
        "subwooferBalance" : 0,
        "fade" : 0,
        "balance" : 0,
        "storageMusicAutoplay" : false,
        "fmRadioAutoplay" : false,
        "ringtoneFile" : ""
    },
    "androidAuto" : {
        "speechAudio" : true,
        "mediaAudio" : true,
        "resolution" : "720p",
        "bluetoothAddress" : "",
        "autostart" : true,
        "dpi" : 160,
        "widthMargin" : 256,
        "heightMargin" : 120,
        "width" : 1024,
        "height" : 600,
        "x" : 0,
        "y" : 600
    },
    "hotspot" : {
        "enabled" : false,
        "hardwareAddress" : "AC:15:A2:98:7C:EF",
        "ipAddress" : "192.168.12.1",
        "passphrase" : "1234567890",
        "ssid" : "Hudiy",
        "bandwidth" : "A"
    },
    "equalizer" : {
        "enabled" : true,
        "step" : 0.25,
        "minValue" : -10,
        "maxValue" : 15,
        "band25" : 0,
        "band40" : 0,
        "band63" : 0,
        "band100" : 0,
        "band160" : 0,
        "band250" : 0,
        "band400" : 0,
        "band630" : 0,
        "band1000" : 0,
        "band1600" : 0,
        "band2500" : 0,
        "band4000" : 0,
        "band6300" : 0,
        "band10000" : 0,
        "band16000" : 0,
        "presets" : [
            {
                "name" : "Flat",
                "band25" : 0,
                "band40" : 0,
                "band63" : 0,
                "band100" : 0,
                "band160" : 0,
                "band250" : 0,
                "band400" : 0,
                "band630" : 0,
                "band1000" : 0,
                "band1600" : 0,
                "band2500" : 0,
                "band4000" : 0,
                "band6300" : 0,
                "band10000" : 0,
                "band16000" : 0
            },
            {
                "name" : "Rock",
                "band25" : 3,
                "band40" : 4,
                "band63" : 5,
                "band100" : 4,
                "band160" : 1,
                "band250" : -3,
                "band400" : -2,
                "band630" : 2,
                "band1000" : 2,
                "band1600" : 4,
                "band2500" : 4,
                "band4000" : 4,
                "band6300" : 3,
                "band10000" : 4,
                "band16000" : 3
            },
            {
                "name" : "Jazz",
                "band25" : 2,
                "band40" : 3,
                "band63" : 4,
                "band100" : 2,
                "band160" : -2,
                "band250" : 0,
                "band400" : 2,
                "band630" : 2,
                "band1000" : 3,
                "band1600" : 3,
                "band2500" : 2,
                "band4000" : 3,
                "band6300" : 3,
                "band10000" : 4,
                "band16000" : 3
            },
            {
                "name" : "Classical",
                "band25" : 3,
                "band40" : 3,
                "band63" : 2,
                "band100" : -2,
                "band160" : 0,
                "band250" : -3,
                "band400" : -2,
                "band630" : 0,
                "band1000" : 2,
                "band1600" : 3,
                "band2500" : 3,
                "band4000" : 2,
                "band6300" : 4,
                "band10000" : 4,
                "band16000" : 4
            },
            {
                "name" : "Pop",
                "band25" : 3,
                "band40" : 4,
                "band63" : 5,
                "band100" : 4,
                "band160" : -2,
                "band250" : -3,
                "band400" : 0,
                "band630" : 2,
                "band1000" : 3,
                "band1600" : 3,
                "band2500" : 4,
                "band4000" : 4,
                "band6300" : 4,
                "band10000" : 5,
                "band16000" : 4
            }
        ]
    },
    "notificatons" : {
        "outputVolumeToast" : true,
        "inputVolumeToast" : true,
        "nowPlaying" : true,
        "notificationDuration" : 8000,
        "toastDuration" : 2000
    },
    "fmRadio" : {
        "bandwidth" : "EU",
        "squelchLevel" : 350,
        "squelchLimit" : 10,
        "rdsEnabled" : true,
        "autoGain" : true,
        "gain" : 0,
        "presets" : [

        ]
    },
    "autobox" : {
        "dpi" : 160,
        "width" : 0,
        "height" : 0,
        "x" : 0,
        "y" : 0,
        "oemName" : "",
        "autoWirelessConnection" : true,
        "vendorId" : 4884,
        "productId" : 5409,
        "bandwidth" : "AUTO"
    },
    "obd" : {
        "deviceType" : "NONE",
        "serialDescriptor" : "",
        "baudrate" : 115200,
        "rfcommAddress" : "",
        "rfcommChannel" : 1,
        "maxInvalidResponseCount" : 20,
        "startupSequence" : [
            "ATZ",
            "ATE0",
            "ATS0",
            "ATL0",
            "ATH0",
            "ATSP0"
        ]
    },
    "api" : {
        "tcpEndpointPort" : 44405,
        "webSocketEndpointPort" : 44406
    },
    "reverseCamera" : {
        "width" : 0,
        "height" : 0,
        "x" : 0,
        "y" : 0,
        "pipeline" : "v4l2src device=/dev/video0 ! videoconvert ! video/x-raw,format=RGBA,width=640,height=480 ! glupload ! qml6glsink name=video-sink"
    }
}

On the top display, there is Hudiy UI and if Android Auto is connected, its displayed on the lower display. Works perfectly fine. My problem is, that the touchinputs from the top display register on the bottom display. The touch of the bottom display are also on the bottom display. If I go in the screen configuration, there is a touchscreen configuration. You can check the Waveshare touchscreen for this display, but it checks both at one. Please see the attachments

So both inputs get redirected to one display. Can please help me get rid of this?

Thanks in advance!

Best regards
Sandro

Re: Dual Displays Touchscreen Issues

Posted: Sat Oct 18, 2025 4:51 pm

by hudiy

Hello,
What happens when you select one of the touch inputs to the other screen? Is it possible?

Labwc stores mapping of touch inputs in $HOME/.config/labwc/rc.xml. If it is not possible to assign the touch input via Screen Configuration Tool, you can try to do it manually in mentioned file.

It might be related to:

https://github.com/raspberrypi/bookworm ... issues/446
https://github.com/raspberrypi/bookworm ... issues/336
https://github.com/raspberrypi/linux/pull/6356
https://github.com/raspberrypi/linux/pull/7061

Re: Dual Displays Touchscreen Issues

Posted: Wed Dec 31, 2025 4:55 pm

by proteinklumpen

Hey,

thanks for the hint and sorry for the late reply. I tried a LOT of stuff, nothing helped. So a short summary about the actual problem:

In the Raspberry Pi Screen Configurator, there are thow "Touch-Devices" with the exact same name. If i select HDMI-A-1 and bind the touchdevice to it, it works. If I use the touchscreen of the second display (HDMI-A-2), it works also on HDMI-A-1. Same vise-versa.

The main problem ist labwc, which is only able to work with the name of the device. But the name of the touchinput is the same. Unfortunately the name ist one of the rare attributes, you can't change with udev rules. I tried to do so. Creating symlinks via udev-rules for the physical addresses of the devices works, but labwc can't handle that. At least I didn't manage to do it. Maybe you can find a solution
Those are my udev-rules (the ones creating symlinks, as changing the device name is proprietary to the kernel):

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sandro@hudiy:/etc/udev/rules.d $ cat 99-waveshare-touch.rules
# Oberes Display
SUBSYSTEM=="input", ATTRS{phys}=="usb-xhci-hcd.1-1.2/input0", SYMLINK+="input/WaveShare_Touch1"

# Unteres Display
SUBSYSTEM=="input", ATTRS{phys}=="usb-xhci-hcd.1-1.3/input0", SYMLINK+="input/WaveShare_Touch2"

This was my labwc config you mentioned:

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<?xml version="1.0"?>
<openbox_config xmlns="http://openbox.org/3.4/rc">
  <libinput>
    <device category="default">
      <pointerSpeed>1,000000</pointerSpeed>
    <leftHanded>no</leftHanded></device>
  </libinput>
  <mouse>
    <doubleClickTime>130</doubleClickTime>
  </mouse>
  <touch devicePath="/dev/input/WaveShare_Touch1" mapToOutput="HDMI-A-1" mouseEmulation="yes"/>
  <touch devicePath="/dev/input/WaveShare_Touch2" mapToOutput="HDMI-A-2" mouseEmulation="yes"/>
  <keyboard>
    <repeatRate>25</repeatRate>
    <repeatDelay>600</repeatDelay>
  </keyboard>&gt;
<touch deviceName="WaveShare WS170120" mapToOutput="HDMI-A-1" mouseEmulation="yes"/></openbox_config>

I also tried the patch for hid-multitouch driver. I really didn't know what I was doing, all ChatGPT. But I documentated all of my commands as you can see in the attatchments. The driver seems to not be used. The modified driver is called "hid-multitouch.ko" (and as a compressed version "hid-multitouch.ko.xz") and its safed at /lib/modules/6.12.47+rpt-rpi-2712/kernel/drivers/hid/. If I do "lsmod | grep hid_multitouch" there is a result. For "lsmod | grep hid-multitouch" nothing. I dont really know what to troubleshoot about this. I just saw something in dmesg, again one event with "hid_multitouch" and two other with "hid-multitouch":

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sandro@hudiy:~ $ dmesg | grep multitouch
[    2.591638] hid_multitouch: loading out-of-tree module taints kernel.
[    2.668212] hid-multitouch 0003:0EEF:0005.0004: input,hiddev96,hidraw3: USB HID v1.11 Device [WaveShare WS170120] on usb-xhci-hcd.0-1.1/input0
[    2.776532] hid-multitouch 0003:0EEF:0005.0005: input,hiddev97,hidraw4: USB HID v1.11 Device [WaveShare WS170120] on usb-xhci-hcd.0-1.2/input0
sandro@hudiy:~ $ cd /lib/modules/$(uname -r)/kernel/drivers/hid/

Now I tried to switch to x11, because it has better output handling. Unfortunately, hudiy would't start anymore. Can I make it work again or is it a dependency? I switched back to wayland, hudiy starts again.

Can you please help me out? I am really desperate finding a solution
Thanks in Advance

Re: Dual Displays Touchscreen Issues

Posted: Wed Dec 31, 2025 5:47 pm

by hudiy

By default, Hudiy is configured to autostart only on labwc, as it is the default window compositor for Raspberry Pi OS. The easiest way to autostart Hudiy on X11 is by using a .desktop file. To do this, create a hudiy.desktop file in the $HOME/.config/autostart

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mkdir -p $HOME/.config/autostart
touch $HOME/.config/autostart/hudiy.desktop
nano $HOME/.config/autostart/hudiy.desktop

and paste the following content to the hudiy.desktop file

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[Desktop Entry]
Type=Application
Name=Hudiy
Exec=/usr/bin/bash -c "$HOME/.hudiy/share/hudiy_run.sh"

You can also open a ticket regarding your touchscreens issue in the official Raspberry Pi Foundation repository. These repositories are monitored by Raspberry Pi engineers:

https://github.com/raspberrypi/trixie-feedback/issues

Re: Dual Displays Touchscreen Issues

Posted: Thu Jan 01, 2026 6:43 pm

by proteinklumpen

Hey,

thanks for the quick reply!! With x11 I was finally able to fix my problem. For everybody who might also run into this problem:

How to switch from wayland to x11:

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sudo raspi-config

Go into the advanced Options -> Wayland -> Choose x11

After that, Hudiy would not start anymore. Thats why its necessary to add hudiy to autostart, like the Mod 'hudiy' told me in the previous post. Thanks

You might also need to reconfigure your display configuration and positioning.

Now you can list your devices

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xinput list

There are your devices with a unique id. In my case id 6 & 7.

You can map the touchscreens to the correct screens like this. You have to try out which way round its right

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xinput map-to-output 6 HDMI-1

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xinput map-to-output 7 HDMI-2

Those changes are not persistent. Unfortunately, the IDs of the devices are also not persistent. If you switch USB-Ports or anything, its the same result. Thats why I wrote a little script, which also runs in autostart

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nano $HOME/.config/autostart/touchscreens.desktop

enter following

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[Desktop Entry]
Type=Application
Name=Touchscreens
Exec=/usr/bin/bash -c "/usr/local/bin/touchscreens_mapping.sh"

Now create the script file

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sudo nano /usr/local/bin/touchscreens_mapping.sh

If you don't need any logic and just want to use the IDs from xinput list, paste this. This works only if you don't change any wiring at all

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#!/bin/sh
xset -dpms
xinput map-to-output <your first ID from xinput list> HDMI-1
xinput map-to-output <your second ID from xinput list> HDMI-2

If you want to have it modular and with a bit more logic to is, paste this:

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#!/bin/sh

#Disable Powermanagement of displays
xset -dpms

#Map Touchscreens
#Get ID from xinput list for Waveshare touchscreens
for id in $(xinput list | grep 'WaveShare WS170120' | sed -n 's/.*id=\([0-9]\+\).*/\1/p'); do
    #Get Device Node (/dev/input/eventX") Value from xinput properties via ID
    devnode=$(xinput list-props "$id" | grep 'Device Node' | sed -n 's/.*"\(.*\)".*/\1/p')
    #Get unique ID_PATH of each touchscreen via - udevadm info /dev/input/eventX
    path=$(udevadm info "$devnode" | grep '^E: ID_PATH=' | cut -d= -f2)

    case "$path" in
        #touchscreen with ID_Path *usb-0:1.2* to HDMI-1
        *usb-0:1.2*)
            xinput map-to-output "$id" HDMI-1
            ;;
        #touchscreen with ID_Path *usb-0:1.1* to HDMI-2
        *usb-0:1.1*)
            xinput map-to-output "$id" HDMI-2
            ;;
    esac
done

The important value for you to find out is via 'udevadm info /dev/input/eventX', where the X represents the number of your device. You can find this devicepath via

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libinput list-devices

Search for your touchscreen devices and find the string, which is called '/dev/input/eventX'

Now replace the X with the number and do a second, more advanced search with the devicePath of the device

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udevadm info /dev/input/event4

You should see something similar like this. One of the unique properties is ID_PATH

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sandro@hudiy:~ $ udevadm info /dev/input/event4
P: /devices/platform/axi/1000120000.pcie/1f00200000.usb/xhci-hcd.0/usb1/1-1/1-1.1/1-1.1:1.0/0003:0EEF:0005.0004/input/input12/event4
M: event4
R: 4
U: input
D: c 13:68
N: input/event4
L: 0
S: input/by-id/usb-WaveShare_WS170120_220211-event-if00
S: input/by-path/platform-xhci-hcd.0-usb-0:1.1:1.0-event
E: DEVPATH=/devices/platform/axi/1000120000.pcie/1f00200000.usb/xhci-hcd.0/usb1/1-1/1-1.1/1-1.1:1.0/0003:0EEF:0005.0004/input/input12/event4
E: DEVNAME=/dev/input/event4
E: MAJOR=13
E: MINOR=68
E: SUBSYSTEM=input
E: USEC_INITIALIZED=3796466
E: ID_INPUT=1
E: ID_INPUT_TOUCHSCREEN=1
E: ID_INPUT_WIDTH_MM=204
E: ID_INPUT_HEIGHT_MM=150
E: ID_BUS=usb
E: ID_MODEL=WS170120
E: ID_MODEL_ENC=WS170120
E: ID_MODEL_ID=0005
E: ID_SERIAL=WaveShare_WS170120_220211
E: ID_SERIAL_SHORT=220211
E: ID_VENDOR=WaveShare
E: ID_VENDOR_ENC=WaveShare
E: ID_VENDOR_ID=0eef
E: ID_REVISION=0111
E: ID_TYPE=hid
E: ID_USB_MODEL=WS170120
E: ID_USB_MODEL_ENC=WS170120
E: ID_USB_MODEL_ID=0005
E: ID_USB_SERIAL=WaveShare_WS170120_220211
E: ID_USB_SERIAL_SHORT=220211
E: ID_USB_VENDOR=WaveShare
E: ID_USB_VENDOR_ENC=WaveShare
E: ID_USB_VENDOR_ID=0eef
E: ID_USB_REVISION=0111
E: ID_USB_TYPE=hid
E: ID_USB_INTERFACES=:030000:
E: ID_USB_INTERFACE_NUM=00
E: ID_USB_DRIVER=usbhid
E: ID_PATH=platform-xhci-hcd.0-usb-0:1.1:1.0
E: ID_PATH_TAG=platform-xhci-hcd_0-usb-0_1_1_1_0
E: LIBINPUT_DEVICE_GROUP=3/eef/5:usb-xhci-hcd.0-1
E: DEVLINKS=/dev/input/by-id/usb-WaveShare_WS170120_220211-event-if00 /dev/input/by-path/platform-xhci-hcd.0-usb-0:1.1:1.0-event

Remember the value of ID_PATH. In my case one touchscreen has "platform-xhci-hcd.0-usb-0:1.1:1.0" and the other "platform-xhci-hcd.0-usb-0:1.1:2.0"

this is my unique identifier, I am using to determine, which touchscreens belongs to which display in the script.

Do this for both touchscreen devices and change the script at the case condition

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case "$path" in
        #touchscreen with ID_Path *usb-0:1.2* to HDMI-1
        *usb-0:1.2*)
            xinput map-to-output "$id" HDMI-1
            ;;
        #touchscreen with ID_Path *usb-0:1.1* to HDMI-2
        *usb-0:1.1*)
            xinput map-to-output "$id" HDMI-2
            ;;
    esac

I hope I could help somebody having the same problem. I almost gave up on this problem but now it works!

Thanks for the help Mr Hudiy! Your reply time is insane! You are doing great work, I love your product so far <3