How to solve error: Could not open any dmaHeap device when using raspi 4b and high quality camera

I am using a fully updated RasPi4B with 8GB of RAM running 64 bit Bookworm. I have done nothing but setting up the Pi and ran apt update and apt ful-upgrade. Now all I want to achieve is to see the rpicam-hello output (the stream). However, starting rpicam-hello always leads to below error. I have tried every solution I could find online, but I still have the error. Is there something I can do to debug this? Is there a solution I just have missed? In every tutorial I see it is just, take Pi, install Bookworm, connect cam and enjoy...

Below please see the error output I get from running rpicam-hello.

felix4b@raspi4b:~ $ rpicam-hello Could not open any dmaHeap device [0:52:27.945362119] [3591] INFO Camera camera_manager.cpp:325 libcamera v0.3.2+99-1230f78d [0:52:27.990398626] [3594] WARN RPiSdn sdn.cpp:40 Using legacy SDN tuning - please consider moving SDN inside rpi.denoise [0:52:27.992612532] [3594] INFO RPI vc4.cpp:447 Registered camera /base/soc/i2c0mux/i2c@1/imx477@1a to Unicam device /dev/media2 and ISP device /dev/media0 [0:52:27.992686494] [3594] INFO RPI pipeline_base.cpp:1120 Using configuration file '/usr/share/libcamera/pipeline/rpi/vc4/rpi_apps.yaml' Made X/EGL preview window Mode selection for 2028:1520:12:P SRGGB10_CSI2P,1332x990/0 - Score: 3456.22 SRGGB12_CSI2P,2028x1080/0 - Score: 1083.84 SRGGB12_CSI2P,2028x1520/0 - Score: 0 SRGGB12_CSI2P,4056x3040/0 - Score: 887 [0:52:29.281632556] [3591] INFO Camera camera.cpp:1197 configuring streams: (0) 2028x1520-YUV420 (1) 2028x1520-SBGGR12_CSI2P [0:52:29.282174107] [3594] INFO RPI vc4.cpp:622 Sensor: /base/soc/i2c0mux/i2c@1/imx477@1a - Selected sensor format: 2028x1520-SBGGR12_1X12 - Selected unicam format: 2028x1520-pBCC dmaHeap allocation failure for rpicam-apps0 ERROR: *** failed to allocate capture buffers for stream *** 

Steps tried to solve the issue

• Checked integrity of the downloaded image.

• sudo apt update followed by sudo apt full-upgrade

• I reflashed bookworm onto the same sd card.

• I reflashed bookworm to another sd card.

• In this post I thought it is my problem and answer: How to fix the libcamera error 'Could not open any dmaHeap device'

  However, adding SUBSYSTEM=="dma_heap", GROUP="video", MODE="0660" to /etc/udev/rules.d/raspberrypi.rules has no impact, same error. I have ensured my user is in the video group.

• I have added more RAM to the GPU gpu_mem=512 also no impact same error.

• I tried running rpi-hello with sudo and without. I get the same error in both cases.

• I even tried the solution outlined here: Troubleshooting dma-heap memory issues. Also adding:

  dtoverlay=vc4-kms-v3d,cma-512 dtoverlay=rpivid-v4l2 

  to /boot/config.txt has no effect.

Can anybody help, or should I just return the Pi and cam as broken?