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    Unsolved How to configure keyboard layout when running QT on EGLFS without X?

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    • JoseCastro
      JoseCastro last edited by JoseCastro

      Hi,

      I've cross-compiled QT 5.12.5 to run on the RPi using EGLFS without a windowing system like X, and everything seems to be working, but I can't figure out how to change the locale/layout of the keyboard inside QT.

      On the console the keyboard is working fine, outputting the expected keys and diacritics for the brazilian ABNT2 keyboard that was configured on the /etc/default/keyboard file.

      I tried both using libinput, which is on by default, and disabling it. Neither respect the setting on the keyboard file and I couldn't figure where QT is looking for keyboard related settings.

      Since I don't have X running commands like setxkbmap and others dealing with 'xkb' won't run, usually complaining about the lack of display.

      Those are some relevant lines from the default log I get by setting QT_LOGGING_RULES=qt.qpa.*=true

      qt.qpa.egldeviceintegration: Using EGL device integration "eglfs_brcm"
qt.qpa.input: libinput: event4  - UVC Camera (046d:0825): is tagged by udev as: Keyboard
qt.qpa.input: libinput: event4  - UVC Camera (046d:0825): device is a keyboard
qt.qpa.input: libinput: event0  - Logitech USB Receiver: is tagged by udev as: Keyboard
qt.qpa.input: libinput: event0  - Logitech USB Receiver: device is a keyboard
qt.qpa.input: libinput: event1  - Logitech USB Receiver Mouse: is tagged by udev as: Mouse
qt.qpa.input: libinput: event1  - Logitech USB Receiver Mouse: device is a pointer
qt.qpa.input: libinput: event2  - Logitech USB Receiver Consumer Control: is tagged by udev as: Keyboard
qt.qpa.input: libinput: event2  - Logitech USB Receiver Consumer Control: device is a keyboard
qt.qpa.input: libinput: event3  - Logitech USB Receiver System Control: is tagged by udev as: Keyboard
qt.qpa.input: libinput: event3  - Logitech USB Receiver System Control: device is a keyboard
qt.qpa.input: Using xkbcommon for key mapping

      And this is what I get when I set QT_QPA_EGLFS_NO_LIBINPUT=1

      qt.qpa.egldeviceintegration: Using EGL device integration "eglfs_brcm"
qt.qpa.input: evdevkeyboard: Using device discovery
qt.qpa.input: udev device discovery for type QFlags<QDeviceDiscovery::QDeviceType>(Device_Keyboard)
qt.qpa.input: Found matching devices ("/dev/input/event4", "/dev/input/event0", "/dev/input/event2", "/dev/input/event3")
qt.qpa.input: Adding keyboard at "/dev/input/event4"
qt.qpa.input: Try to create keyboard handler for "/dev/input/event4" ""
qt.qpa.input: Opening keyboard at "/dev/input/event4"
qt.qpa.input: Create keyboard handler with for device "/dev/input/event4"
qt.qpa.input: Unload current keymap and restore built-in
qt.qpa.input: numlock=0 , capslock=0, scrolllock=0
qt.qpa.input: Adding keyboard at "/dev/input/event0"
qt.qpa.input: Try to create keyboard handler for "/dev/input/event0" ""
qt.qpa.input: Opening keyboard at "/dev/input/event0"
qt.qpa.input: Create keyboard handler with for device "/dev/input/event0"
qt.qpa.input: Unload current keymap and restore built-in
qt.qpa.input: numlock=0 , capslock=0, scrolllock=0
qt.qpa.input: Adding keyboard at "/dev/input/event2"
qt.qpa.input: Try to create keyboard handler for "/dev/input/event2" ""
qt.qpa.input: Opening keyboard at "/dev/input/event2"
qt.qpa.input: Create keyboard handler with for device "/dev/input/event2"
qt.qpa.input: Unload current keymap and restore built-in
qt.qpa.input: numlock=0 , capslock=0, scrolllock=0
qt.qpa.input: Adding keyboard at "/dev/input/event3"
qt.qpa.input: Try to create keyboard handler for "/dev/input/event3" ""
qt.qpa.input: Opening keyboard at "/dev/input/event3"
qt.qpa.input: Create keyboard handler with for device "/dev/input/event3"
qt.qpa.input: Unload current keymap and restore built-in
qt.qpa.input: numlock=0 , capslock=0, scrolllock=0
qt.qpa.input: evdevmouse: Using device discovery
qt.qpa.input: udev device discovery for type QFlags<QDeviceDiscovery::QDeviceType>(Device_Mouse|Device_Touchpad)
qt.qpa.input: Found matching devices ("/dev/input/event1")
qt.qpa.input: Adding mouse at "/dev/input/event1"
qt.qpa.input: create mouse handler for "/dev/input/event1" ""
qt.qpa.input: evdevtouch: Using device discovery
qt.qpa.input: udev device discovery for type QFlags<QDeviceDiscovery::QDeviceType>(Device_Touchpad|Device_Touchscreen)
qt.qpa.input: Found matching devices ()
      1 Reply Last reply Reply Quote 0
      • JoseCastro
        JoseCastro last edited by JoseCastro

        I've found some more environment variables that should help config the XKBCommon behaviour:

        export XKB_LOG_LEVEL=50
export XKB_LOG_VERBOSITY=10

export XKB_DEFAULT_MODEL=logicd
export XKB_DEFAULT_LAYOUT=br
export XKB_DEFAULT_VARIANT=abnt2
export XKB_DEFAULT_OPTIONS=lv3:ralt_switch

export QT_LOGGING_RULES=qt.qpa.*=true

        I got more information about what is being loaded and the keyboard layout seems to match what I press but the diacritics dead-keys don't work at all to compose or to just output them.

        Here are the logs I get running with those options above:

        qt.qpa.input: libinput: event0  - Logitech USB Receiver: is tagged by udev as: Keyboard
qt.qpa.input: libinput: event0  - Logitech USB Receiver: device is a keyboard
qt.qpa.input: libinput: event1  - Logitech USB Receiver Mouse: is tagged by udev as: Mouse
qt.qpa.input: libinput: event1  - Logitech USB Receiver Mouse: device is a pointer
qt.qpa.input: libinput: event2  - Logitech USB Receiver Consumer Control: is tagged by udev as: Keyboard
qt.qpa.input: libinput: event2  - Logitech USB Receiver Consumer Control: device is a keyboard
qt.qpa.input: libinput: event3  - Logitech USB Receiver System Control: is tagged by udev as: Keyboard
qt.qpa.input: libinput: event3  - Logitech USB Receiver System Control: device is a keyboard
qt.qpa.input: Using xkbcommon for key mapping
xkbcommon: DEBUG: Compiling from RMLVO: rules 'evdev', model 'logicd', layout 'br', variant 'abnt2', options 'lv3:ralt_switch'
xkbcommon: DEBUG: Compiling from KcCGST: keycodes 'evdev+aliases(qwerty)', types 'complete', compat 'complete', symbols 'pc+br(abnt2)+inet(evdev)+level3(ralt_switch)'
xkbcommon: DEBUG: Compiling xkb_keycodes "(unnamed)"
xkbcommon: DEBUG: Compiling xkb_types "(unnamed)"
xkbcommon: DEBUG: Compiling xkb_compatibility "(unnamed)"
xkbcommon: DEBUG: The "group" statement in compat is unsupported; Ignored
xkbcommon: DEBUG: The "group" statement in compat is unsupported; Ignored
xkbcommon: DEBUG: The "group" statement in compat is unsupported; Ignored
xkbcommon: DEBUG: The "allowExplicit" field in indicator statements is unsupported; Ignored
xkbcommon: DEBUG: The "allowExplicit" field in indicator statements is unsupported; Ignored
xkbcommon: DEBUG: The "allowExplicit" field in indicator statements is unsupported; Ignored
xkbcommon: DEBUG: The "allowExplicit" field in indicator statements is unsupported; Ignored
xkbcommon: DEBUG: The "indicatorDrivesKeyboard" field in indicator statements is unsupported; Ignored
xkbcommon: DEBUG: The "allowExplicit" field in indicator statements is unsupported; Ignored
xkbcommon: DEBUG: Indicator name "Shift Lock" was not declared in the keycodes section; Adding new indicator
xkbcommon: DEBUG: Indicator name "Group 2" was not declared in the keycodes section; Adding new indicator
xkbcommon: DEBUG: Indicator name "Mouse Keys" was not declared in the keycodes section; Adding new indicator
xkbcommon: DEBUG: Compiling xkb_symbols "(unnamed)"
xkbcommon: WARNING: Multiple symbols for level 1/group 1 on key <TLDE>; Using from, ignoring to
xkbcommon: WARNING: Multiple symbols for level 2/group 1 on key <TLDE>; Using from, ignoring to
xkbcommon: WARNING: Multiple symbols for level 4/group 1 on key <AE02>; Using from, ignoring to
xkbcommon: WARNING: Multiple symbols for level 4/group 1 on key <AE03>; Using from, ignoring to
xkbcommon: WARNING: Multiple symbols for level 3/group 1 on key <AE04>; Using from, ignoring to
xkbcommon: WARNING: Multiple symbols for level 4/group 1 on key <AE04>; Using from, ignoring to
xkbcommon: WARNING: Multiple symbols for level 3/group 1 on key <AE05>; Using from, ignoring to
xkbcommon: WARNING: Multiple symbols for level 2/group 1 on key <AE06>; Using from, ignoring to
xkbcommon: WARNING: Multiple symbols for level 3/group 1 on key <AE06>; Using from, ignoring to
xkbcommon: WARNING: Multiple symbols for level 4/group 1 on key <AE06>; Using from, ignoring to
xkbcommon: WARNING: Multiple symbols for level 3/group 1 on key <AE12>; Using from, ignoring to
xkbcommon: WARNING: Multiple symbols for level 3/group 1 on key <AD01>; Using from, ignoring to
xkbcommon: WARNING: Multiple symbols for level 4/group 1 on key <AD01>; Using from, ignoring to
xkbcommon: WARNING: Multiple symbols for level 3/group 1 on key <AD02>; Using from, ignoring to
xkbcommon: WARNING: Multiple symbols for level 4/group 1 on key <AD02>; Using from, ignoring to
xkbcommon: WARNING: Multiple symbols for level 3/group 1 on key <AD03>; Using from, ignoring to
xkbcommon: WARNING: Multiple symbols for level 4/group 1 on key <AD03>; Using from, ignoring to
xkbcommon: WARNING: Multiple symbols for level 3/group 1 on key <AD04>; Using from, ignoring to
xkbcommon: WARNING: Multiple symbols for level 1/group 1 on key <AD11>; Using from, ignoring to
xkbcommon: WARNING: Multiple symbols for level 2/group 1 on key <AD11>; Using from, ignoring to
xkbcommon: WARNING: Multiple symbols for level 3/group 1 on key <AD11>; Using from, ignoring to
xkbcommon: WARNING: Multiple symbols for level 4/group 1 on key <AD11>; Using from, ignoring to
xkbcommon: WARNING: Multiple symbols for level 1/group 1 on key <AD12>; Using from, ignoring to
xkbcommon: WARNING: Multiple symbols for level 2/group 1 on key <AD12>; Using from, ignoring to
xkbcommon: WARNING: Multiple symbols for level 3/group 1 on key <AD12>; Using from, ignoring to
xkbcommon: WARNING: Multiple symbols for level 1/group 1 on key <BKSL>; Using from, ignoring to
xkbcommon: WARNING: Multiple symbols for level 2/group 1 on key <BKSL>; Using from, ignoring to
xkbcommon: WARNING: Multiple symbols for level 3/group 1 on key <BKSL>; Using from, ignoring to
xkbcommon: WARNING: Multiple symbols for level 4/group 1 on key <BKSL>; Using from, ignoring to
xkbcommon: WARNING: Multiple symbols for level 1/group 1 on key <AC10>; Using from, ignoring to
xkbcommon: WARNING: Multiple symbols for level 2/group 1 on key <AC10>; Using from, ignoring to
xkbcommon: WARNING: Multiple symbols for level 1/group 1 on key <AC11>; Using from, ignoring to
xkbcommon: WARNING: Multiple symbols for level 2/group 1 on key <AC11>; Using from, ignoring to
xkbcommon: WARNING: Multiple symbols for level 3/group 1 on key <AC11>; Using from, ignoring to
xkbcommon: WARNING: Multiple symbols for level 4/group 1 on key <AC11>; Using from, ignoring to
xkbcommon: WARNING: Multiple symbols for level 3/group 1 on key <AB03>; Using from, ignoring to
xkbcommon: WARNING: Multiple symbols for level 4/group 1 on key <AB07>; Using from, ignoring to
xkbcommon: WARNING: Multiple symbols for level 1/group 1 on key <AB10>; Using from, ignoring to
xkbcommon: WARNING: Multiple symbols for level 2/group 1 on key <AB10>; Using from, ignoring to
xkbcommon: WARNING: Multiple symbols for level 1/group 1 on key <BKSL>; Using from, ignoring to
xkbcommon: WARNING: Multiple symbols for level 2/group 1 on key <BKSL>; Using from, ignoring to
xkbcommon: WARNING: Multiple symbols for level 1/group 1 on key <LSGT>; Using from, ignoring to
xkbcommon: WARNING: Multiple symbols for level 2/group 1 on key <LSGT>; Using from, ignoring to
xkbcommon: WARNING: Multiple symbols for level 3/group 1 on key <LSGT>; Using from, ignoring to
xkbcommon: WARNING: Multiple symbols for level 4/group 1 on key <LSGT>; Using from, ignoring to
xkbcommon: WARNING: Multiple symbols for level 2/group 1 on key <KPDL>; Using from, ignoring to
xkbcommon: WARNING: Multiple definitions for group 1 type of key <RALT>; Using ONE_LEVEL, ignoring TWO_LEVEL
xkbcommon: WARNING: Multiple symbols for level 1/group 1 on key <RALT>; Using from, ignoring to
xkbcommon: WARNING: Type "ONE_LEVEL" has 1 levels, but <RALT> has 2 levels; Ignoring extra symbols
xkbcommon: WARNING: Key <OUTP> not found in keycodes; Symbols ignored
xkbcommon: WARNING: Key <KITG> not found in keycodes; Symbols ignored
xkbcommon: WARNING: Key <KIDN> not found in keycodes; Symbols ignored
xkbcommon: WARNING: Key <KIUP> not found in keycodes; Symbols ignored
xkbcommon: WARNING: Key <RO> not found in keycodes; Symbols ignored
xkbcommon: WARNING: Key <I192> not found in keycodes; Symbols ignored
xkbcommon: WARNING: Key <I193> not found in keycodes; Symbols ignored
xkbcommon: WARNING: Key <I194> not found in keycodes; Symbols ignored
xkbcommon: WARNING: Key <I195> not found in keycodes; Symbols ignored
xkbcommon: WARNING: Key <I196> not found in keycodes; Symbols ignored
xkbcommon: INFO: No symbols defined for <JPCM>
xkbcommon: INFO: No symbols defined for <I120>
xkbcommon: INFO: No symbols defined for <AE13>
xkbcommon: INFO: No symbols defined for <I149>
xkbcommon: INFO: No symbols defined for <I154>
xkbcommon: INFO: No symbols defined for <I168>
xkbcommon: INFO: No symbols defined for <I178>
xkbcommon: INFO: No symbols defined for <I183>
xkbcommon: INFO: No symbols defined for <I184>
xkbcommon: INFO: No symbols defined for <FK19>
xkbcommon: INFO: No symbols defined for <FK24>
xkbcommon: INFO: No symbols defined for <I217>
xkbcommon: INFO: No symbols defined for <I219>
xkbcommon: INFO: No symbols defined for <I221>
xkbcommon: INFO: No symbols defined for <I222>
xkbcommon: INFO: No symbols defined for <I230>
xkbcommon: INFO: No symbols defined for <I247>
xkbcommon: INFO: No symbols defined for <I248>
xkbcommon: INFO: No symbols defined for <I249>
xkbcommon: INFO: No symbols defined for <I250>
xkbcommon: INFO: No symbols defined for <I251>
xkbcommon: INFO: No symbols defined for <I252>
xkbcommon: INFO: No symbols defined for <I253>
xkbcommon: WARNING: Key "Alt_R" not found in symbol map; Modifier map entry for Mod1 not updated
xkbcommon: WARNING: Key "Meta_R" not found in symbol map; Modifier map entry for Mod1 not updated
        1 Reply Last reply Reply Quote 0
        • JoseCastro
          JoseCastro last edited by

          I've might have stumbled upon some bugs:

          https://bugreports.qt.io/browse/QTBUG-42181
          https://bugreports.qt.io/browse/QTBUG-48657
          https://bugreports.qt.io/browse/QTBUG-53663
          https://bugreports.qt.io/browse/QTBUG-54792
          https://bugreports.qt.io/browse/QTBUG-59378
          https://bugreports.qt.io/browse/QTBUG-56452
          https://codereview.qt-project.org/c/qt/qtbase/+/207231
          https://codereview.qt-project.org/c/qt/qtbase/+/98062

          Some were fixed on 5.13, but the other is only on dev branch... guess I'll be compiling stuff through the night.

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

            Well, even using the latest revision from dev that includes both changes the dead keys still are not working.

            Guess there still something wrong with what I am doing or the composition with dead keys still has some bug.

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

              I eventually found out that those changes mentioned in the links in the last post require you to set "QT_IM_MODULE=compose" but even then composing didn't work.

              That being the case, I've reported a bug: https://bugreports.qt.io/browse/QTBUG-79097

              I'm keeping this as unanswered until there is a workaround or a fix, but if you do not need dead keys or composition, just setting the XKB_DEFAULT vars and ensuring you are using libinput/xkbcommon should be enough to get your keyboard layout "working".

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