VC4-KMS not working with CM5? #145

Hello!

After switching from PI4B to CM5 on core24 stopped working vc4 driver.

On Raspberry Pi 4B by sudo dmesg | grep vc4:

[ 3.496362] vc4-drm gpu: bound fe400000.hvs (ops vc4_hvs_ops [vc4])
[ 3.500184] rc rc0: vc4-hdmi-0 as /devices/platform/soc/fef00700.hdmi/rc/rc0
[ 3.500322] input: vc4-hdmi-0 as /devices/platform/soc/fef00700.hdmi/rc/rc0/input0
[ 3.506345] input: vc4-hdmi-0 HDMI Jack as /devices/platform/soc/fef00700.hdmi/sound/card0/input1
[ 3.507075] vc4-drm gpu: bound fef00700.hdmi (ops vc4_hdmi_ops [vc4])
[ 3.512241] rc rc1: vc4-hdmi-1 as /devices/platform/soc/fef05700.hdmi/rc/rc1
[ 3.512368] input: vc4-hdmi-1 as /devices/platform/soc/fef05700.hdmi/rc/rc1/input2
[ 3.518685] input: vc4-hdmi-1 HDMI Jack as /devices/platform/soc/fef05700.hdmi/sound/card1/input3
[ 3.518919] vc4-drm gpu: bound fef05700.hdmi (ops vc4_hdmi_ops [vc4])
[ 3.519244] vc4-drm gpu: bound fe004000.txp (ops vc4_txp_ops [vc4])
[ 3.519461] vc4-drm gpu: bound fe206000.pixelvalve (ops vc4_crtc_ops [vc4])
[ 3.519618] vc4-drm gpu: bound fe207000.pixelvalve (ops vc4_crtc_ops [vc4])
[ 3.519762] vc4-drm gpu: bound fe20a000.pixelvalve (ops vc4_crtc_ops [vc4])
[ 3.519870] vc4-drm gpu: bound fe216000.pixelvalve (ops vc4_crtc_ops [vc4])
[ 3.520029] vc4-drm gpu: bound fec12000.pixelvalve (ops vc4_crtc_ops [vc4])
[ 3.527520] [drm] Initialized vc4 0.0.0 20140616 for gpu on minor 0
[ 3.528322] vc4-drm gpu: [drm] Cannot find any crtc or sizes
[ 3.530767] vc4-drm gpu: [drm] Cannot find any crtc or sizes
[ 3.531094] vc4-drm gpu: [drm] Cannot find any crtc or sizes

On Compute module 5 vc4 not loading (sudo dmesg | grep vc4 empty, sudo dmesg | grep fb):

[ 7.050579] bcm2708_fb soc:fb: Unable to determine number of FBs. Disabling driver.
[ 7.058623] bcm2708_fb: probe of soc:fb failed with error -2

Two boards have (snap list):

Name Version Rev Tracking Publisher Notes
console-conf 24.04.1+git45g5f9fae19+g7598200 80 24/stable canonical** -
core24 20250829 1197 latest/stable canonical** base
mesa-2404 24.2.8-snap185 917 latest/stable canonical** -
pi 24-3 151 24/stable canonical** gadget
pi-kernel 6.8.0-1039.43 1047 24/stable canonical** kernel
snapd 2.71 25205 latest/stable canonical** snapd
ubuntu-frame 211-mir2.20.1 12494 24/stable canonical** -

Linux kernel:

Linux localhost 6.8.0-1039-raspi #43-Ubuntu SMP PREEMPT_DYNAMIC Tue Sep 9 12:15:05 UTC 2025 aarch64 aarch64 aarch64 GNU/Linux

config.txt:

dtoverlay=vc4-kms-v3d

Is there a solution to make VC4-KMS work on core24?