I have noticed that PowerMizer is not working anymore and it seems that the card is constantly working at performance level , I have tried a lot of things but no success , NVIDIA stacked at maximum performance.
1.I have re installed Nvidia drivers , kernels etc
2. Disable compositor in Plasma
3. I have removed all widgets
4. Install dkms,kernel and drivers
Well I run out of ideas so am just wondering if the same thing is happening to you as well or is just my pc. :o?