pi@opi5:~/AoC-2023-cplusplus$ lscpu --all --extended
CPU SOCKET CORE L1d:L1i:L2:L3 ONLINE    MAXMHZ   MINMHZ       MHZ
  0      0    0 0:0:0:0          yes 1800.0000 408.0000 1800.0000
  1      0    1 1:1:1:0          yes 1800.0000 408.0000 1800.0000
  2      0    2 2:2:2:0          yes 1800.0000 408.0000 1800.0000
  3      0    3 3:3:3:0          yes 1800.0000 408.0000 1800.0000
  4      0    0 4:4:4:0          yes 2256.0000 408.0000 2256.0000
  5      0    1 5:5:5:0          yes 2256.0000 408.0000 2256.0000
  6      1    2 6:6:6:0          yes 2304.0000 408.0000 2304.0000
  7      1    3 7:7:7:0          yes 2304.0000 408.0000 2304.0000

Why the odd cortex a76 MAXMHZ values.

pi@opi5:~/AoC-2023-cplusplus$ uname -a
Linux opi5 5.10.160-legacy-rk35xx #1 SMP Tue Nov 28 02:45:16 UTC 2023 aarch64 GNU/Linux

 

Providing logs with 

armbianmonitor -u

 helps with troubleshooting and significantly raises chances that issue gets addressed.

https://paste.armbian.com/alanupoxos

Enable OC overlay via armbian-config

That did the trick. Thank you