Develop Bugs

Scaling down screen res

Hey guys!
I just wanted to know if scaling down the screen resolution has any impact on the battery life. All of you who have scaled it down, is there any significant improvement in the battery life?
Sent from my LG-D855 using xda premium

There is an battery improvement but some Apps look horrible with This solution. I am back to 1440p and give a f**k about these 1 or 2 hours.

Der CaRl said:
There is an battery improvement but some Apps look horrible with This solution. I am back to 1440p and give a f**k about these 1 or 2 hours.
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Is that 1-2 hours of SOT, or just usage?

This would all depend on the way you use your phone.
A. If you're a heavy user, (games & movies n stuff) then lower resolutions would benifit tons.
B. If you're a light user, (texts & emails n stuff) then the higher resolutions are very efficent.
There is a common misconception going around about this screen requiring alot of power.
The screen isn't what is draining the device so bad, it's the gpu powering the immense amount of pixels that is causing the power drain.
Now taking that into consideration, there is 3 things to keep in mind.
1. You're still lighting up 3,686,400 mini lightbulbs (aka pixels) no matter what resolution you run at.
2. Lower resolutions = less power draw from the gpu, mostly when the gpu is under higher loads.
3. The gpu doesn't require much power while under lighter loads
So to sum it up
Higher resolution + Very graphic intensive = Heavy power draw from the gpu
Lower resolution + Very graphic intensive = Medium power draw from the gpu
Higher resolution + Not graphic intensive = Low power draw from the gpu
Lower resolution + Not graphic intensive = Low power draw from the gpu
As you can see, under lighter loads 2560x1440 is extremly efficent and preferable by myself, but under heavier loads (games and stuff) 1920x1080 is far more power efficent on the gpu (if your games will even run), once we get a custom kernel for our phones a slight gpu underclock would be MUCH more effective than lowering your resolution.

All this talk of lowering the resolution to save power is rubbish, it doesn't work. Its just a placebo.
By far the biggest cause of drain on the battery from the screen is the backlight, not the resolution. Changing it to a lower resolution doesnt actually change anything, the GPU isnt even trying even at 1440P, it never scales past the second step (330MHz) in 2D. The only thing stopping the GPU from being able to display 4K or even 8K is the bandwidth, not the GPUs power. 2D is effortless for the GPU.
If you reduce the resolution to 1080P the GPU has to rescale that image to 1440P in order to fill the screen (the actual screen resolution is fixed and cannot be changed). All this does is add an extra layer of processing and costs you processor cycles.
In games this changes somewhat, but the effect isnt as big as some like to think. The GPU is still memory bandwidth limited in 3D even at 1440P, not power limited. To prove the point in Basemark X the G3 scores higher than the N5 and almost as high as the M8 and S5, despite having double the pixels.

I bought it for the resolution.. I'm not turning it down.. Otherwise I would have just bought an S5 Or a freeking iphone lmfao
---------- Post added at 08:32 PM ---------- Previous post was at 08:30 PM ----------
At 47% now 10hr usage 2hr SOT.... ESTIMATED 8HRS LEFT..

[Request] Resolution Switch to 1080

Honor 8 Pro is an incredible device, which ticks all the boxes. But since it has a 2k display and a v8 engine in it, it chunks on the 4k battery pretty quickly.
If there is some way, we could lower the resolution to 1080 similar to that on S8 and S8+, I think the battery life will almost double!
Inputs?!

aKp1 said:
Honor 8 Pro is an incredible device, which ticks all the boxes. But since it has a 2k display and a v8 engine in it, it chunks on the 4k battery pretty quickly.
If there is some way, we could lower the resolution to 1080 similar to that on S8 and S8+, I think the battery life will almost double!
Inputs?!
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You can there is option in battery section when needed it automatically lower the resolution !!!

We actually don't know when it gets activated. It would be better if the user is given better control of the resolution! Like to lock the display on 1080 to preserve battery and then to switch the display to 2k while playing HD games or watching VR

Charging time more
aKp1 said:
We actually don't know when it gets activated. It would be better if the user is given better control of the resolution! Like to lock the display on 1080 to preserve battery and then to switch the display to 2k while playing HD games or watching VR
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Is Battery Charging take more time, when screen resolution is reduced?

CRNair said:
Is Battery Charging take more time, when screen resolution is reduced?
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It saves battery instead.
Sent from my Honor 8 using XDA Labs

nil.d said:
You can there is option in battery section when needed it automatically lower the resolution !!!
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like others have mentioned, ideally, we want something we can manually control. like what is found on many other phones with 2K screen... users can manually select between 2k, 1080p and even 720p.
right now, the one under the battery/ power savings... we don't even know when it gets activated... or if it works (coz honestly, i can't tell any diff between 1080p and 2K on such small screen).

Hi,
Although there is a option to lower screen resolution to reduce battery consumption, we don't know when it exactly kicks into play or if it does at all. I suspect it only reduces the strength of the pixels.
We have raised this query in the recent meeting which was held in Chennai. They took it with a nod, not sure if it will be implemented. We did point out as to how S8 and S8+ does it.

amulbaby said:
Hi,
Although there is a option to lower screen resolution to reduce battery consumption, we don't know when it exactly kicks into play or if it does at all. I suspect it only reduces the strength of the pixels.
We have raised this query in the recent meeting which was held in Chennai. They took it with a nod, not sure if it will be implemented. We did point out as to how S8 and S8+ does it.
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Take a screenshot before and after enabling the option to lower screen res, you'll ses the difference between the resolution of both screenshots

PalakMi said:
Take a screenshot before and after enabling the option to lower screen res, you'll ses the difference between the resolution of both screenshots
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No. You won't see it.
Sent from my Honor 8 using XDA Labs

adriansticoid said:
No. You won't see it.
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I meant when you look in the info (details) of the screenshot

adriansticoid said:
No. You won't see it.
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We will see the difference bro. The lose of pixels

gopinaidu77 said:
We will see the difference bro. The lose of pixels
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Didn't see mine.
Sent from my Honor 8 using XDA Labs

adriansticoid said:
Didn't see mine.
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You will see when an app which sucks too much battery , during that the pixel will be decreased.

PPSSPP needs this...

Current emui 5.1 low res option are not decrease resolution to 1080p I think. Its just reduce the pixels a bit and automatically activated only on power hungry apps. Logically if change resolution at least your screen will flicker a bit. Dont worry upcoming emui 8 will have option to truly change your resolution either 2k, 1080p and even 720p. I think its coming to our phone in January.
Sent from my Honor 8 Pro using XDA Labs

Does lowering screen resolution from 2k to 1080p even save that much battery power?

DrGreenway said:
Does lowering screen resolution from 2k to 1080p even save that much battery power?
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Battery not very much affected, but gaming got better performance if in 1080p.
Sent from my Honor 8 Pro using XDA Labs

Will lowering resolution increase battery life?

The settings allow you to lower the resolution. I lowered the resolution to 2340 x 1080 and I don't really notice anything different.... Would this increase battery life? If so, how much?

It will definitely increase battery life.
How much will it increase depends on your usage and your apps installed. It should at max give you 10% increase.

id3alistic said:
Would this increase battery life? If so, how much?
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It is well and widely known that lowering resolution won't give you increased battery life. At all

Ah thanks. I come from an xperia z3 so been using FHD screens only. I was interested in the XZ1 compact back then and one of the key points from reviewers is that the lower screen resolution(720p) saved a lot more battery vs the XZ1 at 1080p.

id3alistic said:
Ah thanks. I come from an xperia z3 so been using FHD screens only. I was interested in the XZ1 compact back then and one of the key points from reviewers is that the lower screen resolution(720p) saved a lot more battery vs the XZ1 at 1080p.
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I think the misconception is lowering the screen resolution vs a device that maxes out at a lower resolution. Maybe it makes a difference for OLEDs...but for LCD screens, all if the pixels are still illuminated, so there's not much difference there.

AarSyl said:
I think the misconception is lowering the screen resolution vs a device that maxes out at a lower resolution. Maybe it makes a difference for OLEDs...but for LCD screens, all if the pixels are still illuminated, so there's not much difference there.
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Sounds convincing and makes sense. I wonder why they'd allow it on this device though?

20degrees said:
Sounds convincing and makes sense. I wonder why they'd allow it on this device though?
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Because Samsung's can do it.
Nothing but hype for the misinformed and ill-advised.
[Dopey voice]"Bruh...look what my phone can do to save battery life. Can yours?" [/Dopey voice]

Using lower resolutions use less power bc they use less gpu computational power. Youre not saving anything really from the screen itself. Think of it this way does your computer/laptop use more power running resource intensive applications or running idle?

id3alistic said:
Ah thanks. I come from an xperia z3 so been using FHD screens only. I was interested in the XZ1 compact back then and one of the key points from reviewers is that the lower screen resolution(720p) saved a lot more battery vs the XZ1 at 1080p.
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As one said here it's from misinformed people.
id3alistic said:
XZ1 compact back then and one of the key points from reviewers is that the lower screen resolution(720p) saved.
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Not that the resolution that saved power. If Sony could put their 3840x2160 resolution display into 4.3" size of XZ1 compact it still would run longer on battery than any 6.5" sized phone from similar battery even with 720p display. Because it's sheer size of screen that saves battery, not the resolution. 4.3" vs 6.5" is hefty difference. One needs more light to make 6.5" display emit light than to make 4.3" one hence one need more power.
Think about it this way, if resolution would matter then XZ Premium and XZ2 Premium would drain their batteries in a matter of minutes with 3840x2160 res displays. Right? But they work almost as long as say Galaxy S9 Plus or Note 8.
---------- Post added at 07:58 PM ---------- Previous post was at 07:52 PM ----------
Nirrik said:
Think of it this way does your computer/laptop use more power running resource intensive applications or running idle?
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It not works like that. When your phone renders picture in 720p or 1080p it doesn't do it sitting idle. It still consumes power when rendering picture 60 times a sec. And its GPU still runs at 200MHz, maybe it needs like 230 or 250MHz for rendering picture in 1440p but is 250MHz vs 200 MHz a huge difference? I doubt it
It's not like 1440 picture rendering needs full GPU power but 720p or 1080p can be powered by idle GPU. Never was, never will. Ask devs in http://forum.xda-developers.com/android/software-hacking if in doubt

In reality ability to pick your resolution for battery life is a gimmick and doesn't really do anything.
There were no proofs that phones live longer from same charge when it's resolution lowered. Maybe it works for constant gaming, like playing games in 720p on a 1440p screen will bump battery life. But in other cases no

Taking only power consumption from the display alone, there is no different between HD, FHQ, QHD. The different is that if a game or any apps(or even system app itselfs) runs at HD, it will need less graphic computational power than running at QHD (once again, its not about the drainage from the display, its from GPU).

romeokk said:
The different is that if a game or any apps(or even system app itselfs) runs at HD, it will need less graphic computational power than running at QHD (once again, its not about the drainage from the display, its from GPU).
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in reality, it's bull****. learn how GPU works. Try to ask Google devs if you don't know. They do habitate here, at XDA
It's not like it renders something and then goes to sleep turning cores off as CPU does. Instead GPU renders frame 60 times a sec and uses 203MHz either your resolution is 720p or 1080p. It can't lower frequency to 100MHz magically because it's not designed that way. So it consumes as much power working at 203MHz either rendering 720p frames or rendering 1080p frames.
Hence no battery economy achieved

Billy Madison said:
in reality, it's bull****. learn how GPU works. Try to ask Google devs if you don't know. They do habitate here, at XDA
It's not like it renders something and then goes to sleep turning cores off as CPU does. Instead GPU renders frame 60 times a sec and uses 203MHz either your resolution is 720p or 1080p. It can't lower frequency to 100MHz magically because it's not designed that way. So it consumes as much power working at 203MHz either rendering 720p frames or rendering 1080p frames.
Hence no battery economy achieved
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See this:
https://www.google.co.th/url?sa=t&s...FjADegQIBRAB&usg=AOvVaw3qEXVbk4h0XmHcDhhRUR1P

Change refresh rate of S20 Ultra

Is it possible to change the refresh rate of the ultra Form 120hz to like 90hz. I'm using it for about 1 week and I feel like the 120 hz do drain the battery.
There was a possibility to change the S10s 60hz to 90hz but there for rooting was required. I feel like the change for the S20 should be easier...
Regards

No. Only 60 and 120 is used.

Question Is LTPO 3.0 safe for eyes ? What PWM frequency is Vivo X80 Pro using ?

This may seem too obvious but think about it. Turning on show refresh rate option shows you a continuously changing refresh rate 10-24-30-60-120 Hz . LTPO can bring down the refresh rate to 10Hz but that constant switching between refresh rates may be adding flickers not consciously noticeable but may have an effect on the eyes in long term ?
This is to save the battery but can eyes adapt to a such a high degree of variable refresh rate ? Does anyone know the PWM frequency of Vivo X80 Pro LTPO 3.0 ? I did check with a slo-mo camera and it does show flicker (black lines moving across the screen). Honor 4 Pro is claiming a LTPO screen with highest ever PWM frequency for eliminating flicker. Any insight into this will be much appreciated.

Narendra_B said:
This may seem too obvious but think about it. Turning on show refresh rate option shows you a continuously changing refresh rate 10-24-30-60-120 Hz . LTPO can bring down the refresh rate to 10Hz but that constant switching between refresh rates may be adding flickers not consciously noticeable but may have an effect on the eyes in long term ?
This is to save the battery but can eyes adapt to a such a high degree of variable refresh rate ? Does anyone know the PWM frequency of Vivo X80 Pro LTPO 3.0 ? I did check with a slo-mo camera and it does show flicker (black lines moving across the screen). Honor 4 Pro is claiming a LTPO screen with highest ever PWM frequency for eliminating flicker. Any insight into this will be much appreciated.
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Honor has 1920PWM if i remember correctly, idk how much the vivo has.
But i'll break you a myth, the LTPO does NOT improve performance unless you maybe watching YouTube all day and even so.
So far all the smartphones that has poor battery life, including the x80 Pro, has LTPO.
Based on my use, i just use the 120hz and it goes down to 10hz when possible, coming from the Mate 40 Pro which has 60 or 90 only with no LTPO, the Mate 40 Pro had better battery life.
They is no eye strain with either of them if you sit in the proper angle, i haven't noticed anything anyway.

Derpling said:
Honor has 1920PWM if i remember correctly, idk how much the vivo has.
But i'll break you a myth, the LTPO does NOT improve performance unless you maybe watching YouTube all day and even so.
So far all the smartphones that has poor battery life, including the x80 Pro, has LTPO.
Based on my use, i just use the 120hz and it goes down to 10hz when possible, coming from the Mate 40 Pro which has 60 or 90 only with no LTPO, the Mate 40 Pro had better battery life.
They is no eye strain with either of them if you sit in the proper angle, i haven't noticed anything anyway.
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Thanks for replying. Firstly Congratulations for your ROG6 phone . LTPO may be saving a little bit of battery but there are many other factors especially SD Gen 1.
But I am worried about LTPO's constantly varying refresh rate. In my 2 months of usage of X80 Pro I had two or three episodes of headache which may be very well be coincidental due to other factors. It did prompt me to research more on PWM frequency of X80 pro and what effect does LTPO have on eyes.

Narendra_B said:
Thanks for replying. Firstly Congratulations for your ROG6 phone . LTPO may be saving a little bit of battery but there are many other factors especially SD Gen 1.
But I am worried about LTPO's constantly varying refresh rate. In my 2 months of usage of X80 Pro I had two or three episodes of headache which may be very well be coincidental due to other factors. It did prompt me to research more on PWM frequency of X80 pro and what effect does LTPO have on eyes.
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That's a good point that no reviewer actually checked or researched.
I had the X80 pro for a month and never had any headache, you might be sensitive to certain PWM frequency.
If you can check the Honor Magic 4 Pro you might deny or confirm that.

Derpling said:
That's a good point that no reviewer actually checked or researched.
I had the X80 pro for a month and never had any headache, you might be sensitive to certain PWM frequency.
If you can check the Honor Magic 4 Pro you might deny or confirm that.
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I have no way to check magic 4. Also , I did not find a way to force 60 or 120 Hz on X80 pro. Tried adb command and SetEdit. At least locking it to 60Hz minimum will be good enough even though it defeats the purpose of LTPO.
Does anyone know how to do that ?

Narendra_B said:
I have no way to check magic 4. Also , I did not find a way to force 60 or 120 Hz on X80 pro. Tried adb command and SetEdit. At least locking it to 60Hz minimum will be good enough even though it defeats the purpose of LTPO.
Does anyone know how to do that ?
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It should be under the display settings>refresh rate.
Don't choose Auto, choose 120hz, and it will be 120hz all the time unless there is no motion on the screen.

Derpling said:
It should be under the display settings>refresh rate.
Don't choose Auto, choose 120hz, and it will be 120hz all the time unless there is no motion on the screen.
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Choosing a refresh rate in settings just sets the maximum refresh rate. I would like it to be at least 60Hz at all times which happens in all non-LTPO phones .

Narendra_B said:
Choosing a refresh rate in settings just sets the maximum refresh rate. I would like it to be at least 60Hz at all times which happens in all non-LTPO phones .
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If you trigger the "show refresh rate" at the developer menu, you'll see it drops from 120hz to 10hz quite often.
Even if you'll force 60hz it will drop to 10hz, that's just how it works.
I don't think you can put a threshold of 60hz as minimum as opposed to 10hz.

Derpling said:
If you trigger the "show refresh rate" at the developer menu, you'll see it drops from 120hz to 10hz quite often.
Even if you'll force 60hz it will drop to 10hz, that's just how it works.
I don't think you can put a threshold of 60hz as minimum as opposed to 10hz.
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Right. That's how LTPO works but in other phones , it will stay at 60Hz even if it is static picture. The flicker at 10Hz could be more than 60Hz unless the PWM frequency is high enough. Am I getting it right ?

Narendra_B said:
Right. That's how LTPO works but in other phones , it will stay at 60Hz even if it is static picture. The flicker at 10Hz could be more than 60Hz unless the PWM frequency is high enough. Am I getting it right ?
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Indeed.
But Vivo hasn't published information about the PWM frequency, so we're in the dark for now.

There is a new Notebookcheck analysis of X80 pro, but the frequency is pretty low
Vivo X80 Pro smartphone review: Primus camera with huge fingerprint sensor
In our review, the Vivo X80 attempts to impress with a quad camera, Snapdragon 8 Gen 1, ample storage, fast charging and probably the largest, fastest and most versatile fingerprint sensor.
www.notebookcheck.net

Derpling said:
If you trigger the "show refresh rate" at the developer menu, you'll see it drops from 120hz to 10hz quite often.
Even if you'll force 60hz it will drop to 10hz, that's just how it works.
I don't think you can put a threshold of 60hz as minimum as opposed to 10hz.
Click to expand...
Click to collapse
I am on W30 funtouch OS 12.0.12.12 and I noticed that Show Refresh Rate is now showing 120 Hz all the time if 120 Hz is selected in settings. Even Youtube is at 120 Hz which is great. Even in Smart switch mode the refresh rate only toggles between 60 Hz and 120 Hz . In essence LTPO has stopped working and I did not notice battery drainage as such so I am happy also due to concerns on LTPO safety on eyes and the phone feels fast irrespective of whether an app supports 120 Hz or not