Notebook Video, Display and Touch

Hello,

I have received the new HP Pavilion 15 ck-038TX a few days ago. Since then, while gaming, the FPS drops to 20+ (from ~100 in CSGO and ~60 in Diablo 3) whenever I am charging this laptop. Problem still persists when battery is removed and laptop is only being powered by AC adapter. When unplugged and powered by battery, FPS in games stays constant at around 100 and 60 respectively.

This also happens when I run a GPU benchmark. The power supplied to the CPU suddenly drops from ~15W to ~3W for a few seconds then returns to 15W. CPU clock speed dropped to 399Mhz minimum.

When running a CPU benchmark, this does not happen at all. CPU utilization stays at 100% all the time.

I have tested CPU and GPU temps, and none of them are hitting above 75 degrees so i doubt it could be caused by thermal throttling or overheating. 

All drivers and BIOS are updated. I have checked the power options, and it still happens when both power settings for on battery and charging are the same.

I have a 19.5V, 3.33A, 65W power adapter 

CPU: i7-8550U

GPU: MX150

Could it be possible that the AC adapter is providing insufficient power for both CPU and GPU to run at the same time? (I have checked the power required at the back of the laptop, it is similar to that of the adapter at 65W)

I have already received a replacement 65W adapter from HP, but this issue still occurs.

After contacting tech support, a lady on the phone told me that laptops' performance decrease when charging, and recommends me to use the laptop on battery for better performance? What??

After doing some searching on Google, there seems to be a few similar individual cases being brought up on various forums. Some of them were solved via a BIOS update, a few commented that it could be a problem with the AC adapter.

I have no idea how the BIOS work, but seeing that this model has a relatively new CPU and GPU, and probably a new motherboard too, could it be possible that there are some problems with this BIOS version and HP has yet to update it?

Thank you very much!