Hi,
I saw something similar so decided to share it here. Maybe it will help you.
I have this in my /usr/share/X11/xkb/symbols/us
key <TLDE> { [ grave, asciitilde, dead_grave, dead_tilde ] };
key <AE06> { [ 6,asciicircum, dead_circumflex, dead_caron ] };
key <AE11> { [ minus, underscore, dead_macron, degree ] };
key <AD11> { [ bracketleft, braceleft, guillemotleft, dead_doublegrave ] };
key <AD12> { [bracketright, braceright, guillemotright, dead_doubleacute ] };
key <AC11> { [apostrophe, quotedbl, dead_acute, dead_diaeresis ] };
key <AB08> { [ comma, less, dead_cedilla, dead_ogonek ] };
key <AB10> { [ slash, question, questiondown, dead_stroke ] };
key <BKSL> { [ backslash, bar, dead_greek, brokenbar ] };
key <LSGT> { [ backslash, bar, dead_greek, brokenbar ] };
Running setupconf gives me 8 warnings:
Mar 10 15:36:22 msi console-setup.sh[560]: WARNING: Unknown X keysym "dead_greek"
Mar 10 15:36:22 msi console-setup.sh[560]: WARNING: Unknown X keysym "dead_greek"
Mar 10 15:36:22 msi console-setup.sh[560]: WARNING: Unknown X keysym "dead_greek"
Mar 10 15:36:22 msi console-setup.sh[560]: WARNING: Unknown X keysym "dead_greek"
Mar 10 15:36:22 msi console-setup.sh[560]: WARNING: Unknown X keysym "dead_greek"
Mar 10 15:36:22 msi console-setup.sh[560]: WARNING: Unknown X keysym "dead_greek"
Mar 10 15:36:22 msi console-setup.sh[560]: WARNING: Unknown X keysym "dead_greek"
Mar 10 15:36:22 msi console-setup.sh[560]: WARNING: Unknown X keysym "dead_greek"
dead_grave, dead_circumflex, dead_tilde, dead_acute, dead_cedilla, and dead_diaeresis work as intended on the console, the other dead keys spit out the normal characters. In X all the dead keys work as intended.
Did you check your logs?
My system:
-- System Information:
Debian Release: bullseye/sid
APT prefers testing
APT policy: (500, 'testing')
Architecture: amd64 (x86_64)
Kernel: Linux 5.10.0-1-amd64 (SMP w/4 CPU threads)
Locale: LANG=en_GB.UTF-8, LC_CTYPE=en_GB.UTF-8 (charmap=UTF-8), LANGUAGE=en_GB:en
Shell: /bin/sh linked to /bin/dash
Init: systemd (via /run/systemd/system)
LSM: AppArmor: enabled
Versions of packages console-setup depends on:
ii console-setup-linux 1.200
ii debconf 1.5.74
ii keyboard-configuration 1.200
ii xkb-data 2.29-2
console-setup recommends no packages.
Versions of packages console-setup suggests:
ii locales 2.31-9
ii lsb-base 11.1.0
Versions of packages keyboard-configuration depends on:
ii debconf 1.5.74
ii liblocale-gettext-perl 1.07-4+b1
Versions of packages console-setup-linux depends on:
ii init-system-helpers 1.60
ii initscripts 2.96-5
ii kbd 2.3.0-3
ii keyboard-configuration 1.200
console-setup-linux suggests no packages.
Versions of packages console-setup is related to:
pn console-common <none>
pn console-data <none>
pn console-tools <none>
pn gnome-control-center <none>
ii kbd 2.3.0-3
ii systemd 247.2-5
-- debconf information:
keyboard-configuration/store_defaults_in_debconf_db: true
console-setup/charmap47: UTF-8
console-setup/codesetcode: Lat15
console-setup/codeset47: # Latin1 and Latin5 - western Europe and Turkic languages
console-setup/fontface47: Fixed
console-setup/store_defaults_in_debconf_db: true
console-setup/fontsize: 8x16
console-setup/fontsize-fb47: 8x16
keyboard-configuration/optionscode: ctrl:nocaps
keyboard-configuration/altgr: The default for the keyboard layout
keyboard-configuration/ctrl_alt_bksp: false
keyboard-configuration/unsupported_options: true
console-setup/framebuffer_only:
keyboard-configuration/unsupported_layout: true
* keyboard-configuration/layout: English (US)
keyboard-configuration/unsupported_config_layout: true
keyboard-configuration/modelcode: pc105
keyboard-configuration/compose: No compose key
console-setup/guess_font:
keyboard-configuration/xkb-keymap: us
console-setup/use_system_font:
keyboard-configuration/switch: No temporary switch
keyboard-configuration/variantcode: altgr-weur
keyboard-configuration/toggle: No toggling
keyboard-configuration/layoutcode: us
console-setup/fontsize-text47: 8x16
debian-installer/console-setup-udeb/title:
keyboard-configuration/other:
* keyboard-configuration/unsupported_config_options: true
* keyboard-configuration/model: Generic 105-key PC (intl.)
* keyboard-configuration/variant: English (US) - English (intl., with AltGr dead keys)
greetings,
Johan