Created attachment 131807 [details]
Visual representation of the bug

SUMMARY


STEPS TO REPRODUCE
1. Open ksysguard;
2. Select process in the list, do right click and select "Set priority..." in the menu;
3. See values of maximum and minimum priority for CPU scheduler.

OBSERVED RESULT
Lowest priority is 20 and highest priority is -19.

EXPECTED RESULT
Lowest priority should be 19 and highest should be -20, according to the `man 2 nice`.
"""
The range of the nice value is +19 (low priority) to -20 (high priority).
"""

SOFTWARE/OS VERSIONS
Operating System: Fedora 32
KDE Plasma Version: 5.19.5
KDE Frameworks Version: 5.74.0
Qt Version: 5.14.2
Kernel Version: 5.8.4-200.fc32.x86_64
OS Type: 64-bit
Processors: 4 × AMD FX(tm)-9590 Eight-Core Processor
Memory: 22.4 ГиБ of RAM
Graphics Processor: GeForce GTX 1060 6GB/PCIe/SSE2