Hey there,
I bought myself an Aspire 5 A515-54-52VX last year to replace my old laptop. Shortly after I got it, I noticed the large speed-drop whilst charging. The CPU normally clock to 4.2Ghz (I5 10210u) and only slows down on heavy loads. But when ever I plug in the charger it drops down to 1.0Ghz to even 0.4Ghz or 0.5Ghz and makes the Laptop unusable. Any power-saving features are off and the maximum power plan is enabled. I'm running a Windows 10 2004 Pro N 64 bit on it. Drivers all are Windows-Standard drivers.
Firstly I suspected a weak charger so I built a larger one. The original was a 2.6A one. My go-to is a 4.6A charger and for testing purposes I even went up to a PSU-monster capable of up to 23A at 19V but all to no avail. Heat is also not the matter. I heated it to 40°C and froze it rock solid but the Clock-rates didn't go up the slightest bit.
So after almost half a year of trying, I decide to write here since it has gotten quite difficult to charge the laptop between lessons so that it is usable when I need it.
I hope you guys can help me. Thank you in advance.