Latitude 5420 CPU Frequency is low

System info:

- Model: Latitude 5420

- CPU: Intel i5-1145g7

- OS: Windows 10

- Bios: 1.21.2

 

Issue:

- The system runs slow

- The CPU frequency sits at 1.5Ghz

- Running a 100% CPU load continuously leaves the CPU at 1.5Ghz

- Windows Task Manager reports 11th Gen Intel(TM) 15-1145G7 @ 2.60GHz (but the frequency reading never gets above 1.5GHz).

 

Attempted fixes which failed:

- Running on power adapter and running on battery

- Updating the bios and drivers

- Turning off Intel SpeedStep and other cpu speed technologies in the bios (turbo and hyperthreading left on)

- Checked windows power settings, minimum and maximum cpu usage are good, no energy saving settings are on

- F12 Diagnostics -> All tests passed

- Unplugging the battery from the board for a while (the fix for the stuck at 0.8Ghz problem)

 

Bios:

- Battery Health: Excellent

- Processor Type: 11th Gen Intel(R) Core(TM) i5-1145G7 @ 2.60Ghz

- Maximum Clock Speed: 4.40Ghz

- Minimum Clock Speed: 0.40Ghz

- Current Clock Speed: 1.5Ghz

Bios -> Power

- Thermal Management: Ultra Performance

- Intel Speed Shift: Off (tried both ways)

Bios -> Performance: (tried SpeedStep both ways and have toggled Turbo Boost on and off, no change)

- SpeedStep: Off (tried both ways, I think it lets the clock drop but doesn't increase past 1.5Ghz)

- C-States: On

- Turbo Boost: On

- Hyper-Threading: On

 

I hope there is something simple that I'm missing here.