6 cores are visible but no work is distributed to the 2 Denver cores

I am wondering why no work is ever assigned to the two Denver cores although I am running in the MAX-N model. I have both tested with nvpmodel -m 0 and by running jetson_clocks.
I am able to see all 6 cores in both top, htop and in tegrastats but the CPU load of the two Denver cores always remains at 0%.

I am able to launch a new process and move it to the Denver cores with taskset but no work is automatically distributed to these cores. Why is that so?
I am running Ubuntu 18.04 from JetPack 4.4.1.

Best regards
Thomas Jespersen

If you run command “cat /proc/cmdline”, do you see something like “isolcpus=1-2”? If so, then this is why. You can disable that by editing “/boot/extlinux/extlinux.conf”. If you see “isolcpus=1-2” near the end, then remove the “1-2” so it truncates without mentioning “1-2” (this is the same as removing isolcpus, but if isolcpus exists somewhere else, then it overrides the other isolcpus).

Wonderful, this did indeed solve the problem.
To make it clear to others I modified the line in /boot/extlinux/extlinux.conf which had “isolcpus=1-2” such that it said “isolcpus=

Thank you so much.