Intel HD 4000 Clock Rate issue

I posted this question at Intel communities and they said to contact Acer.

I have laptop Acer Aspire E1-570, with Core i3 3227u CPU and Intel HD 4000 GPU.

So, I have low fps in games when AC power is plugged in (such as Paladins at low settings).

I tested with CPUID HWMONITOR and it shows Intel hd 4000 using only 349 Mhz clock rate. But I know it can use up to ~1100 Mhz.

Weird thing is what, When I'm playing from battery power it shows 1100 Mhz and fps is normal. But when I plug my AC adapter it goes down to 349 Mhz and stuck there (It doesn't go up back even if I plug out AC power and even after restart).

I tested my AC adapter too, and it shows 19 V as needed (It's original adapter).

Temperatures is normal too.

I tried Windows 10 and Windows 7. It's the same.

Power options - High Performance for battery and ac power. (Min and max core clock is 100%)

Intel HD settings - High Performance.

I tried different versions of Intel HD drivers.

Tried Intel Diagnostics tool and it says everything is OK.

Tested GPU stress test with FurMark. And again GPU clock rate stuck at 350 Mhz.

So, can you give me a good solution for this issue?

Note: There is no SpeedStep (EIST) option and any other options in my BIOS and there is no update for my BIOS.