Dell Latitude D620 Stuck at 1Ghz when unplugged
For some reason, my computer runs slow and won’t turn on the fans when I am using my Latitude D620 laptop unplugged. When it is not plugged in, it throttles down to 1ghz with 40 percent CPU utilization and everything runs slower. But the moment I plug in the charger, it jumps back up to 2.19Ghz and goes back up to 100 percent CPU utilization. Is there a reason why this is happening? I have another D620 and it doesn’t have this issue at all. The cooling assembly is clean and there is no dust and I added some fresh thermal paste as well. The fan is confirmed to work as I heard it ramp up during the BIOS flash.
Also I checked the power plans and I am on High Performance. I have already tried removing and reinserting the battery and reflashing the bios but nothing seems to work.