Here the workaround to get a "gdm" login screen:
root@ password:
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/_\ _ _ _ __ | |__(_)__ _ _ _
/ _ \| '_| ' \| '_ \ / _` | ' \
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v25.11.2 for Khadas VIM3 running Armbian Linux 6.12.58-current-meson64
Performance:
Load: 25% Uptime: 4 minutes Local users: 3
Memory usage: 8% of 3.68G
CPU temp: 38°C Usage of /: 11% of 58G
RX today: 920 MiB
Tips:
Armbian config utility https://tinyurl.com/yc39n6m3
Commands:
Configuration : armbian-config
Monitoring : htop
root@khadas-vim3:~# systemctl --failed
UNIT LOAD ACTIVE SUB DESCRIPTION
0 loaded units listed.
Issue #1:
No login screen on HDMI:
root@khadas-vim3:~# systemctl status gdm.service
● gdm.service - GNOME Display Manager
Loaded: loaded (/usr/lib/systemd/system/gdm.service; static)
Active: active (running) since Mon 2025-12-15 17:25:25 CET; 4min 28s ago
Process: 2684 ExecStartPre=/usr/share/gdm/generate-config (code=exited, status=0/SUCCESS)
Main PID: 2699 (gdm3)
Tasks: 4 (limit: 4215)
Memory: 8.9M (peak: 10.4M)
CPU: 414ms
CGroup: /system.slice/gdm.service
└─2699 /usr/sbin/gdm3
Dec 15 17:27:04 khadas-vim3 gdm3[2699]: Gdm: on_display_added: assertion 'GDM_IS_REMOTE_DISPLAY (display)' failed
Dec 15 17:27:04 khadas-vim3 gdm3[2699]: Gdm: on_display_removed: assertion 'GDM_IS_REMOTE_DISPLAY (display)' failed
Dec 15 17:28:40 khadas-vim3 gdm3[2699]: Gdm: GdmDisplay: Session never registered, failing
Dec 15 17:28:40 khadas-vim3 gdm3[2699]: Gdm: on_display_added: assertion 'GDM_IS_REMOTE_DISPLAY (display)' failed
Dec 15 17:28:40 khadas-vim3 gdm3[2699]: Gdm: on_display_removed: assertion 'GDM_IS_REMOTE_DISPLAY (display)' failed
Dec 15 17:28:40 khadas-vim3 gdm-autologin][3881]: PAM unable to dlopen(pam_gnome_keyring.so): /usr/lib/security/pam_gnome_keyring.so: cannot open shared object file: No >
Dec 15 17:28:40 khadas-vim3 gdm-autologin][3881]: PAM adding faulty module: pam_gnome_keyring.so
Dec 15 17:28:40 khadas-vim3 gdm-autologin][3881]: pam_unix(gdm-autologin:session): session opened for user amach(uid=1000) by amach(uid=0)
Dec 15 17:28:41 khadas-vim3 gdm3[2699]: Gdm: on_display_added: assertion 'GDM_IS_REMOTE_DISPLAY (display)' failed
Dec 15 17:28:41 khadas-vim3 gdm3[2699]: Gdm: on_display_removed: assertion 'GDM_IS_REMOTE_DISPLAY (display)' failed
root@khadas-vim3:~# ll /dev/dri/
total 0
drwxr-xr-x 2 root root 140 Dec 15 17:25 by-path
crw-rw----+ 1 root video 226, 0 Dec 15 17:25 card0
crw-rw----+ 1 root video 226, 1 Dec 15 17:25 card1
crw-rw----+ 1 root video 226, 2 Dec 15 17:25 card2
crw-rw----+ 1 root render 226, 128 Dec 15 17:25 renderD128
crw-rw----+ 1 root render 226, 129 Dec 15 17:25 renderD129
root@khadas-vim3:~# udevadm info /dev/dri/card0
P: /devices/platform/soc/ff900000.vpu/drm/card0
M: card0
R: 0
U: drm
T: drm_minor
😧 c 226:0
N: dri/card0
L: 0
S: dri/by-path/platform-ff900000.vpu-card
E: DEVPATH=/devices/platform/soc/ff900000.vpu/drm/card0
E: DEVNAME=/dev/dri/card0
E: DEVTYPE=drm_minor
E: MAJOR=226
E: MINOR=0
E: SUBSYSTEM=drm
E: USEC_INITIALIZED=2805131
E: ID_PATH=platform-ff900000.vpu
E: ID_PATH_TAG=platform-ff900000_vpu
E: ID_FOR_SEAT=drm-platform-ff900000_vpu
E: DEVLINKS=/dev/dri/by-path/platform-ff900000.vpu-card
E: TAGS=:master-of-seat:uaccess:seat:
E: CURRENT_TAGS=:master-of-seat:uaccess:seat:
root@khadas-vim3:~# udevadm info /dev/dri/card1
P: /devices/platform/soc/ffe40000.gpu/drm/card1
M: card1
R: 1
U: drm
T: drm_minor
😧 c 226:1
N: dri/card1
L: 0
S: dri/by-path/platform-ffe40000.gpu-card
E: DEVPATH=/devices/platform/soc/ffe40000.gpu/drm/card1
E: DEVNAME=/dev/dri/card1
E: DEVTYPE=drm_minor
E: MAJOR=226
E: MINOR=1
E: SUBSYSTEM=drm
E: USEC_INITIALIZED=7219633
E: ID_PATH=platform-ffe40000.gpu
E: ID_PATH_TAG=platform-ffe40000_gpu
E: GDM_NUMBER_OF_GRAPHICS_CARDS=3
E: ID_FOR_SEAT=drm-platform-ffe40000_gpu
E: DEVLINKS=/dev/dri/by-path/platform-ffe40000.gpu-card
E: TAGS=:seat:master-of-seat:uaccess:
E: CURRENT_TAGS=:seat:master-of-seat:uaccess:
root@khadas-vim3:~# udevadm info /dev/dri/card2
P: /devices/platform/etnaviv/drm/card2
M: card2
R: 2
U: drm
T: drm_minor
😧 c 226:2
N: dri/card2
L: 0
S: dri/by-path/platform-etnaviv-card
E: DEVPATH=/devices/platform/etnaviv/drm/card2
E: DEVNAME=/dev/dri/card2
E: DEVTYPE=drm_minor
E: MAJOR=226
E: MINOR=2
E: SUBSYSTEM=drm
E: USEC_INITIALIZED=7215211
E: ID_PATH=platform-etnaviv
E: ID_PATH_TAG=platform-etnaviv
E: GDM_NUMBER_OF_GRAPHICS_CARDS=3
E: ID_FOR_SEAT=drm-platform-etnaviv
E: DEVLINKS=/dev/dri/by-path/platform-etnaviv-card
E: TAGS=:master-of-seat:uaccess:seat:
E: CURRENT_TAGS=:master-of-seat:uaccess:seat:
WORKAROUND - Issue #1:
root@khadas-vim3:/dev/dri# mv card2 card2out
root@khadas-vim3:/dev/dri# ll
total 0
drwxr-xr-x 2 root root 140 Dec 15 17:33 by-path
crw-rw----+ 1 root video 226, 0 Dec 15 17:35 card0
crw-rw----+ 1 root video 226, 1 Dec 15 17:25 card1
crw-rw----+ 1 root video 226, 2 Dec 15 17:25 card2out
crw-rw----+ 1 root render 226, 128 Dec 15 17:25 renderD128
crw-rw----+ 1 root render 226, 129 Dec 15 17:25 renderD129
root@khadas-vim3:/dev/dri# systemctl restart gdm.service
root@khadas-vim3:/dev/dri# systemctl status gdm.service
● gdm.service - GNOME Display Manager
Loaded: loaded (/usr/lib/systemd/system/gdm.service; static)
Active: active (running) since Mon 2025-12-15 17:38:56 CET; 7s ago
Process: 8999 ExecStartPre=/usr/share/gdm/generate-config (code=exited, status=0/SUCCESS)
Main PID: 9006 (gdm3)
Tasks: 5 (limit: 4215)
Memory: 6.2M (peak: 7.2M)
CPU: 172ms
CGroup: /system.slice/gdm.service
└─9006 /usr/sbin/gdm3
Dec 15 17:38:56 khadas-vim3 systemd[1]: Starting gdm.service - GNOME Display Manager...
Dec 15 17:38:56 khadas-vim3 systemd[1]: Started gdm.service - GNOME Display Manager.
Dec 15 17:38:56 khadas-vim3 gdm-autologin][9011]: PAM unable to dlopen(pam_gnome_keyring.so): /usr/lib/security/pam_gnome_keyring.so: cannot open shared object file: No >
Dec 15 17:38:56 khadas-vim3 gdm-autologin][9011]: PAM adding faulty module: pam_gnome_keyring.so
Dec 15 17:38:56 khadas-vim3 gdm-autologin][9011]: pam_unix(gdm-autologin:session): session opened for user amach(uid=1000) by amach(uid=0)
Dec 15 17:38:56 khadas-vim3 gdm3[9006]: Gdm: on_display_added: assertion 'GDM_IS_REMOTE_DISPLAY (display)' failed
Dec 15 17:38:56 khadas-vim3 gdm3[9006]: Gdm: on_display_removed: assertion 'GDM_IS_REMOTE_DISPLAY (display)' failed
---
Issue #2:
Missing Display resolution 3440x1440 for Display Dell U3415W connected to HDMI:
root@khadas-vim3:/home/amach# cat xrandr.txt
Screen 0: minimum 16 x 16, current 2560 x 1440, maximum 32767 x 32767
HDMI-1 connected primary 2560x1440+0+0 (normal left inverted right x axis y axis) 800mm x 330mm
2560x1440 59.91*+
1920x1440 59.90
1600x1200 59.87
1440x1080 59.87
1400x1050 59.86
1280x1024 59.76
1280x960 59.94
1152x864 59.78
1024x768 59.68
800x600 59.86
640x480 59.38
320x240 59.52
1920x1200 59.88
1680x1050 59.85
1440x900 59.89
1280x800 59.81
1152x720 59.75
960x600 59.63
928x580 59.88
800x500 59.50
768x480 59.38
720x480 59.71
640x400 59.20
320x200 58.96
2048x1152 59.90
1920x1080 59.88
1600x900 59.82
1368x768 59.88
1280x720 59.86
1024x576 59.90
864x486 59.45
720x400 59.55
640x350 59.77
root@khadas-vim3:/dev/dri# inxi -Gxx
Graphics:
Device-1: meson-g12a-vpu driver: meson_drm v: N/A bus-ID: N/A chip-ID: amlogic:ff900000
Device-2: meson-g12a-mali driver: panfrost v: kernel bus-ID: N/A chip-ID: amlogic:ffe40000
Device-3: meson-g12a-dw-hdmi driver: meson_dw_hdmi v: N/A bus-ID: N/A
chip-ID: amlogic:ff600000
Display: server: X.org v: 1.21.1.11 with: Xwayland v: 23.2.6 compositor: gnome-shell v: 46.0
driver: X: loaded: modesetting gpu: meson_drm,panfrost,meson_dw_hdmi tty: 170x62
Monitor-1: HDMI-A-1 model: Dell U3415W res: 3440x1440 dpi: 109 diag: 865mm (34.1")
API: EGL v: 1.5 platforms: gbm: drv: etnaviv surfaceless: drv: panfrost inactive: wayland,x11
API: OpenGL v: 3.1 compat-v: 2.1 vendor: mesa v: 25.0.7-0ubuntu0.24.04.2
note: console (EGL sourced) renderer: Vivante GC8000 rev 7120, Mali-G52 (Panfrost)
Please let me know or test to set the display resolution to 3440x1440 - Thank you
