RTX A5000 stuck at 400-500MHz due to HW Power Brake Slowdown on Ubuntu 20.04.3

nvidia-bug-report.log.gz (2.2 MB)
I have an issue with the SM clocks on my RTX A5000. Under Cuda loads and openGL benchmarks, the GPU switches to power mode P2 but SM clock speeds remain below 500 MHz. The reason for this seems to be:
HW Power Brake Slowdown : Active

But actually it doesn’t reach the limit of 230 W and system-wise I have a 1.6kW power supply for 4 RTX cards.
Unfortunately I cannot resolve this issue. I would be grateful for any help.