Zenbook UX325EA weird thottle coming back to and from AC mode

[gabrio81]

System: Windows 10 Home
Battery or AC: both
Model: UX325EA
Frequency of occurrence: always
Reset OS:
Screenshot or video:
========================
Detailed description：
hello,
When i start my laptop the CPU is 90% of the time at a nice high speed on OC and super stable, whether it's on AC or also on battery - in high performance mode, and "performance" from the Asus app, great!! for instance i get 4.05 - 4.35 - 4.50 ghz.
BUT when i unplug AC then it drops down noticeably. Even if i am on battery FIRST stable on 4.3ghz then I plug in the AC then it drops. it seems when there is a "change" in power source, there is a drop or something triggers.
Why does this happen?
During these times, laptop wasn't under pressure or load or anything at that time, so is really cold and cool, no temperature increase (which i know affects the tiny zenbook), so why does the clock drops so much when you change the power source? either on battery TO AC or AC to battery? simply by unplugging or plugging it? all intel power savings are switched off.
is that because the machine thinks that during AC operation it might overheat? then if i restart it goes again to high frequency. or just cycling on and off hibernate 2-3 times, which is what i do most often, sometimes it even takes 4 cycles of hibernation, which are fast anyway since it's a very fast laptop. Still is it possible to avoid this?
thanks
Gabrio

[RAJU_MSC_MATHEM]

gabrio81

1. System: Windows 10 Home
2. Battery or AC: both
3. Model: UX325EA
4. Frequency of occurrence: always
5. Reset OS:
6. Screenshot or video:

========================

Detailed description：

hello,

When i start my laptop the CPU is 90% of the time at a nice high speed on OC and super stable, whether it's on AC or also on battery - in high performance mode, and "performance" from the Asus app, great!! for instance i get 4.05 - 4.35 - 4.50 ghz.

BUT when i unplug AC then it drops down noticeably. Even if i am on battery FIRST stable on 4.3ghz then I plug in the AC then it drops. it seems when there is a "change" in power source, there is a drop or something triggers.

Why does this happen?

During these times, laptop wasn't under pressure or load or anything at that time, so is really cold and cool, no temperature increase (which i know affects the tiny zenbook), so why does the clock drops so much when you change the power source? either on battery TO AC or AC to battery? simply by unplugging or plugging it? all intel power savings are switched off.

is that because the machine thinks that during AC operation it might overheat? then if i restart it goes again to high frequency. or just cycling on and off hibernate 2-3 times, which is what i do most often, sometimes it even takes 4 cycles of hibernation, which are fast anyway since it's a very fast laptop. Still is it possible to avoid this?

thanks

Gabrio

Zenbook UX325EA weird thottle coming back to and from AC mode

Take your laptop nearest Asus service center or if the laptop is under warranty then call for an onsite warranty to check the laptop hardware properly.

[gabrio81]

well, that doesn't really qualify for a full reset - i want to know if others experience the same first of all - then it's not an issue.
Plus it could be because i disabled modern standby - i really don't like that feature so i have the classic power plans and the i7 does some funny stuff with frequencies anyway.

[ferko1276]

So your laptop will lock to a lower frequency and never or barely goes above?
And every time you plug or unplug the charger it will drop even lower?

[ferko1276]

If it goes back again when you run demanding apps then it's likely normal behavior. Why this might happen?
Higher frequencies require higher CPU core voltages to keep the core stable.
Power consumption is proportional to: V^2 * freq
Doubling the voltage would result in roughly ~ 4x power draw on the same frequency.
For these reasons it makes perfect sense to scale down the clock (and voltages) when the core is idling especially on battery power.