CoreCtrl is a free open source app that gives you precise control over your AMD Radeon graphics card, and limited control over your AMD or Intel CPU. While the developer plans to include support for Nvidia graphics cards in the future, right now CoreCtrl is focused on bringing one of the best utilities from AMD’s Radeon Adrenalin software to Linux.
Where CoreCtrl truly shines is letting users create settings profiles that automatically engage the custom clock speeds, power settings and fan curves when the associated game or app is launched.
It even boasts support for Windows applications in addition to native Linux ones.
For me its only giving basic AMD CPU info and is not yet working with my Nvidia GPU, but this may work better for you and it looks like it has lots of potential.
See Meet The Software That Does For Linux Gaming What AMD Won’t
If the big guys like AMD won’t treat Linux like a first class citizen, count on the FOSS community to get the job done.