My DELL notebook, E6320, occasionally got a problem for while.
When it booted, its BIOS shown that it could not get wattage information from an adapter.
At the time, I just omitted and used it as usual.
But the notebook did not work fast as it was ,and I did not know why.
Until I lost my patience, then I tried to find out the cause.
Since the problem related to lacking of wattage information, the BIOS tried to save a power consumption as much as possible.
As a result, it reduced the CPU frequency to minimum value.
For problem solving method, please follow the link below: