Rockchip HDMI No Display: "[drm] Cannot find any crtc or sizes"
[drm] Cannot find any crtc or sizesThe DRM driver found no connected output with a usable mode. The monitor was not detected, EDID could not be read, or the VOP→HDMI route is not enabled in the device tree.
Applies to: RK3588 RK3588S RK3576 RK3568 RK3566 RK3399 RK3328 RK3288
Symptoms
- Black screen on HDMI, and dmesg shows "Cannot find any crtc or sizes"
- Serial console works normally
Common causes
- HDMI node or its VOP port/endpoint disabled in the DTB
- HPD (hot-plug detect) GPIO or DDC I2C not working
- HDMI PHY / PLL for the requested mode unsupported
- Monitor powered on after boot and HPD not re-triggered
How to fix it
- Check connector state
cat /sys/class/drm/*/status cat /sys/class/drm/card*-HDMI-A-1/modes - Enable the full display route
The hdmi node, the hdmi_in_vp endpoint and the VOP video port it links to must all be "okay".
- Force a mode to bypass EDID
append ... video=HDMI-A-1:1920x1080@60e
FAQ
What does "[drm] Cannot find any crtc or sizes" mean?
The DRM driver found no connected output with a usable mode. The monitor was not detected, EDID could not be read, or the VOP→HDMI route is not enabled in the device tree.
What causes "[drm] Cannot find any crtc or sizes"?
HDMI node or its VOP port/endpoint disabled in the DTB; HPD (hot-plug detect) GPIO or DDC I2C not working; HDMI PHY / PLL for the requested mode unsupported; Monitor powered on after boot and HPD not re-triggered.
How do I fix "[drm] Cannot find any crtc or sizes"?
1. Check connector state 2. Enable the full display route: The hdmi node, the hdmi_in_vp endpoint and the VOP video port it links to must all be "okay". 3. Force a mode to bypass EDID
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