I do not have myself a rPi4 to test, and when I looked at the issue for my rPi, I think I saw that the GPU for the rPi4 is different, so probably also the kernel module... Could you list the the drm related modules loaded on your kernel, and the exact kernel version you have? I will look at the corr...

Just to add to the above solution (or workaround, as you prefer :) ), to make the change permanent, and as it needs to be applied after reboot... Create a file called /usr/local/sbin/disable-drm-pm : #!/bin/bash [ -n "$1" ] || exit 1 echo "on" > "/sys/$1/power/control" Make it executable: chmod 755 ...

This is a somehow old topic, but I have spent the last days trying to find a solution for this: [ 26.929682] [drm:vc4_bo_create [vc4]] *ERROR* Failed to allocate from CMA: [ 26.936664] [drm] V3D: 51052kb BOs (46) [ 26.943072] [drm] V3D shader: 56kb BOs (14) [ 26.949460] [drm] dumb: 8148kb BOs (4) [ ...