Here's what I get when booting with the cubieboard dts: [ 1.728145] sun4i-drm display-engine: bound 1e00000.display-frontend (ops 0xc0a991d0) [ 1.728324] sun4i-drm display-engine: bound 1e20000.display-frontend (ops 0xc0a991d0) [ 1.728769] sun4i-drm display-engine: bound 1e60000.display-backend (ops 0xc0a98948) [ 1.729127] sun4i-drm display-engine: bound 1e40000.display-backend (ops 0xc0a98948) [ 1.729663] sun4i-drm display-engine: No panel or bridge found... RGB output disabled [ 1.729694] sun4i-drm display-engine: bound 1c0c000.lcd-controller (ops 0xc0a96e08) [ 1.730170] sun4i-drm display-engine: No panel or bridge found... RGB output disabled [ 1.730197] sun4i-drm display-engine: bound 1c0d000.lcd-controller (ops 0xc0a96e08) [ 1.731739] sun4i-drm display-engine: bound 1c16000.hdmi (ops 0xc0a99bb4) [ 1.732958] [drm] Initialized sun4i-drm 1.0.0 20150629 for display-engine on minor 0 [ 1.733040] sun4i-drm display-engine: [drm] Cannot find any crtc or sizes [ 1.740576] sun4i-drm display-engine: [drm] Cannot find any crtc or sizes [ 20.185738] systemd[1]: Starting modprobe@drm.service - Load Kernel Module drm... [ 20.660147] systemd[1]: modprobe@drm.service: Deactivated successfully. [ 20.680927] systemd[1]: Finished modprobe@drm.service - Load Kernel Module drm. [ 29.081755] [drm] Initialized lima 1.2.0 20200215 for 1c40000.gpu on minor 1 And here's what I get when I boot with the topwise a721 dts: [ 3.444277] sun4i-drm display-engine: bound 1e00000.display-frontend (ops 0xc0a991d0) [ 3.444440] sun4i-drm display-engine: bound 1e20000.display-frontend (ops 0xc0a991d0) [ 3.444985] sun4i-drm display-engine: bound 1e60000.display-backend (ops 0xc0a98948) [ 3.445348] sun4i-drm display-engine: bound 1e40000.display-backend (ops 0xc0a98948) [ 3.446154] sun4i-drm display-engine: bound 1c0c000.lcd-controller (ops 0xc0a96e08) [ 3.446799] sun4i-drm display-engine: No panel or bridge found... RGB output disabled [ 3.446830] sun4i-drm display-engine: bound 1c0d000.lcd-controller (ops 0xc0a96e08) [ 3.473706] [drm] Initialized sun4i-drm 1.0.0 20150629 for display-engine on minor 0 [ 3.555810] sun4i-drm display-engine: [drm] fb0: sun4i-drmdrmfb frame buffer device [ 7.940078] systemd[1]: Starting modprobe@drm.service - Load Kernel Module drm... [ 8.543295] systemd[1]: modprobe@drm.service: Deactivated successfully. [ 8.553328] systemd[1]: Finished modprobe@drm.service - Load Kernel Module drm. [ 15.005964] [drm] Initialized lima 1.2.0 20200215 for 1c40000.gpu on minor 1 Thanks, Shivam

Providing logs with armbianmonitor -u helps with troubleshooting and significantly raises chances that issue gets addressed.

If you need hdmi support use vendor or edge kernel. 6.12 was released with a bare minimum of support for rk3588 so nonworking hdmi is kind a expected.

I added a patch that activates the gpu. https://lore.kernel.org/linux-sunxi/20250706025625.2707073-1-iuncuim@gmail.com A ready to install kernel is available for manjaro. But it's worth realizing that without output it will be useless at the moment.

v4l2loopback-dkms 0.12.7-2 fails to build make.log: DKMS make.log for v4l2loopback-0.12.7 for kernel 6.12.32-current-rockchip64 (aarch64) Sat Jul 5 09:16:17 PM CDT 2025 Building v4l2-loopback driver... make -C /lib/modules/6.12.32-current-rockchip64/build M=/var/lib/dkms/v4l2loopback/0.12.7/build modules make[1]: Entering directory '/usr/src/linux-headers-6.12.32-current-rockchip64' CC [M] /var/lib/dkms/v4l2loopback/0.12.7/build/v4l2loopback.o /var/lib/dkms/v4l2loopback/0.12.7/build/v4l2loopback.c: In function ‘vidioc_querycap’: /var/lib/dkms/v4l2loopback/0.12.7/build/v4l2loopback.c:717:9: error: implicit declaration of function ‘strlcpy’; did you mean ‘strncpy’? [-Werror=implicit-function-declaration] 717 | strlcpy(cap->driver, "v4l2 loopback", sizeof(cap->driver)); | ^~~~~~~ | strncpy cc1: some warnings being treated as errors make[3]: *** [scripts/Makefile.build:229: /var/lib/dkms/v4l2loopback/0.12.7/build/v4l2loopback.o] Error 1 make[2]: *** [/usr/src/linux-headers-6.12.32-current-rockchip64/Makefile:1945: /var/lib/dkms/v4l2loopback/0.12.7/build] Error 2 make[1]: *** [Makefile:224: __sub-make] Error 2 make[1]: Leaving directory '/usr/src/linux-headers-6.12.32-current-rockchip64' make: *** [Makefile:43: v4l2loopback.ko] Error 2 Edit: I had the wrong make.log contents. The old one was after I tried to fix it and failing. The actual build error is missing strlcpy().