Hi Everyone,
I have successfully enabled and flashed the Xenomai 4 kernel on my Raspberry Pi CM4. The system boots up, and I can access the terminal via the serial console. However, the HDMI display is not working—there’s no output on the screen.
When I checked the kernel logs, I found the following errors:
[ 1.041571] brcm-pcie fd500000.pcie: link down
[ 3.190781] vc4-drm gpu: [drm] *ERROR* Failed to get ddc i2c adapter by node
It seems like the VC4 DRM driver is failing to initialize. I have already tried the following:
Editing /boot/firmware/config.txt to add:
hdmi_force_hotplug=1
hdmi_group=2
hdmi_mode=82
config_hdmi_boost=7
dtoverlay=vc4-kms-v3d
Checking dmesg | grep -i drm and dmesg | grep -i hdmi, but the errors persist.
Ensuring that the necessary drivers (CONFIG_DRM_VC4, CONFIG_I2C_BCM2835, CONFIG_FRAMEBUFFER_CONSOLE) are enabled in the kernel configuration.
Despite these steps, the HDMI display remains blank. I would appreciate any insights or suggestions on how to resolve this issue.
I have successfully enabled and flashed the Xenomai 4 kernel on my Raspberry Pi CM4. The system boots up, and I can access the terminal via the serial console. However, the HDMI display is not working—there’s no output on the screen.
When I checked the kernel logs, I found the following errors:
[ 1.041571] brcm-pcie fd500000.pcie: link down
[ 3.190781] vc4-drm gpu: [drm] *ERROR* Failed to get ddc i2c adapter by node
It seems like the VC4 DRM driver is failing to initialize. I have already tried the following:
Editing /boot/firmware/config.txt to add:
hdmi_force_hotplug=1
hdmi_group=2
hdmi_mode=82
config_hdmi_boost=7
dtoverlay=vc4-kms-v3d
Checking dmesg | grep -i drm and dmesg | grep -i hdmi, but the errors persist.
Ensuring that the necessary drivers (CONFIG_DRM_VC4, CONFIG_I2C_BCM2835, CONFIG_FRAMEBUFFER_CONSOLE) are enabled in the kernel configuration.
Despite these steps, the HDMI display remains blank. I would appreciate any insights or suggestions on how to resolve this issue.
Statistics: Posted by Nidhi Shende — Tue Feb 11, 2025 4:13 am — Replies 0 — Views 28