December 15, 2025Dec 15 Here the workaround to get a "gdm" login screen: root@ password: _ _ _ /_\ _ _ _ __ | |__(_)__ _ _ _ / _ \| '_| ' \| '_ \ / _` | ' \ /_/ \_\_| |_|_|_|_.__/_\__,_|_||_| 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 Edited December 15, 2025Dec 15 by amach
January 19Jan 19 Author After applying the following two kernel patches which I understand are valid for mainline kernel only, I can use the display properly with a resolution 3440x1440 and refresh rate of 60Hz: patchwork.kernel.org [RFC,v1] drm/meson: venc: add support for HDMI DMT modes up to 3840x2160 -... github.com/chewitt/linux WIP: drm/meson: add support for higher bandwidth DMT modes committed Jan 5, 2026 xdarklight +3 -3 There's a report from a user with a DELL U3415W monitor and a Khadas VIM3 statin… - But having both patches applied or not does not matter, in general with mainline kernel the display is flickering/shaking only during boot, any idea how to get this addressed? thx
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