yashsingh1/xdaforums huggingface dataset:
[AT&T HTC One (M7)] Corey.C:
Fastboot Tampered?

At the top of your devices when at the fastboot screen does it say Tampered?
[AT&T HTC One (M7)] irokgalaxy:
Yes mine says that. I am a new to this, what do i need to do
[T-Mobile HTC One (M7)] Brandon.rush1:
Does anyone know a time frame or when to expect the RUU for the One?
[T-Mobile HTC One (M7)] jntdroid:
I asked the same thing in the main RUU thread, though it's not necessarily necessary with the stock nandroid / recovery floating around out there.
[About XDA developers] agentfazexx:
Is XDA undergoing some kind of major change? Various parts of the forums have been obscenely slow lately. Today for me it's the UserCP. Before that the last couple days, it's been the entire site.
[About XDA developers] Clark Joseph Kent:
Yes, some maintenance, all is well now. Thanks
[About XDA developers] bitpushr:
I'm wondering, is the usercp any faster for you now?
[About XDA developers] agentfazexx:
It is now this morning, yes.
[About XDA developers] agentfazexx:
UserCP is quite slow again.
[About XDA developers] mrtzong:
Experienced same thing yesterday... Couldn't log on for half a day

Ok now tho
[Galaxy S 4 General] Ddot196:
So basically the s4 is claiming a longer battery life through web browsing by dimming its screen automatically? I could already tell this, which is when I first bought a galaxy phone I downloaded another browser. I can't stand how Samsung handles the web in terms of the screen. Really annoying.

coming from the og one x
[Galaxy S 4 General] Jme369:
Isn't part of this issue due to thermal throttling? As amoled screens work at maximum load on while backgrounds, so could it therefore heat up more and thereby have to adjust the brightness?
[Galaxy S 4 General] puremind:
This is not only in web browsing, so this affects all browsers (though there may be different treatment for video, I would have to test using video patterns).

The really annoying thing is that the throttling mechanism can't be defeated, so let's say you want to check something really fast while in the sun, you can't even temporarily make your browser go brighter. But you're right that with the Stock/Chrome browser this is actualy worse.

I must say that I did not have other Samsung devices except the S2. I am interested in other user views on the S3 and Note II. Was the same observed? Was the clipping that bad? Those who installed the Perseus Kernel on their Note II, was this circumvented or was only the color temperature and color accuracy fixed? I heard from one user I met at the shops that when he used the Persus Kernel to correct the screen, his battery would get depleted.

A brightness cap at 250cd/m² is not acceptable for web browsing. But then a battery life of 3 hours screen time would not be acceptable either. It is a trade-off. Still, one would wish the user had a choice to boost the brightness for short periods of time.
[Galaxy S 4 General] puremind:
No thermal throttling is indicated with a message. This is more of an adaptative brightness mechanism, but much more aggressive than what can be observed on the HTC One (the One will vary between 400cd/m2 and 530cd/m² depending on the content).

This is the regular behavior for bright content handling.

You can actually observe this on your browser while browsing and when scrolling from content that is bright (text) to content that is less bright (darker picture) and vice versa, you will clearly see how suddenly the brightness increases and decreases (in real time). The same can be observed when you launch your browser. Coming from a less bright picture level into the browser will cause it to clip whites, so you will see it dim within the first second.
[Galaxy S 4 General] DocRambone:
No such thing on my 9500, even compared to a HTC its bright in browser.

You must have a faulty unit or some setting that prevent full brightness in browser.
[Galaxy S 4 General] puremind:
The pictures were not from me! They all behave the same. This is something I had observed in 4 different shops. This is something that others have reported. It can be observed in Anandtech's readings on the S4 review.

All I am doing is quantifying what users and testers, including myself, have observed. It is a generalized mechanism.

You can actually observe this on your browser while browsing and when scrolling from content that is bright (text) to content that is less bright (darker picture) and vice versa, you will clearly see how suddenly the brightness increases and decreases (in real time). The same can be observed when you launch your browser. Coming from a less bright picture level into the browser will cause it to clip whites, so you will see it dim within the first second.

Note that on mixed content with only patches of bright colors/white (e.g. page with pictures or video), white point brightness will be more around 300cd/m². This happens when the average picture increases.
[Galaxy S 4 General] DocRambone:
Still, some setting/unit is clearly wrong. The brightness with a full white webpage is very high. Check settings again, turn off the adaptive screen settings etc.
[Galaxy S 4 General] AndreiLux:
Uh yea, turn off Auto Adjust Screen Tone in the screen settings.

Otherwise this is the CABC / content aware brightness control on the AMOLED controller. I'll have to check it later in the kernel.
[Galaxy S 4 General] puremind:
Yes the Auto-Adjust off improves the white clipping but does not solve the issue. It is still a 20% loss. Thanks for showing-up Andrei, as you are probably the most knowledgeable person in this forum regarding the trade-offs between brightness and battery on those AMOLED devices. My short testing on this device makes me worry that with Auto-Adjust and Power saving turned off, the S4 will run out of battery after 3 hours of web browsing (average white level at 250cd/m²)....Does this sound about right?

To what brightness level was the Perseus Kernel calibrated on the Note II?

That would be a high price to pay to have an equivalent browsing experience as on competing LCD devices!

This is the detailed analysis for all settings combinations (except auto-brightness, which would vary depending on environment light).
[Galaxy S 4 General] DocRambone:
No, wrong, with all power savings off i loose 10% battery for each 45-50 min web-browsing session. (autobrightness +5)

No problem to get 6+ hours out of one charge
[Galaxy S 4 General] puremind:
Auto-brightness+5 is very aggressive battery saving - it caps brightness at 145cd/m² in the sun! In terms of brightness, this is equivalent to having both power saving and auto adjust ON and run maximum brighness.

I agree that with this setup you can probably reach 6 hours, but this is quite conservative. Suppose you increase brightness to 250cd/m² (screen not completely white), would this then translate into 4 hours of battery?
[Galaxy S 4 General] BoneXDA:
The Galaxy S4 performs very well in high ambient lighting in spite of its typically lower screen brightness because it has one of the smallest screen Reflectance values of any display we have ever tested, and its more saturated colors can help cut through the reflected light glare. When Automatic Brightness is turned on, the screen brightness increases considerably at high levels of ambient lighting as mentioned above. The Galaxy S4 is then comparable or brighter than most LCD Smartphones.

http://www.displaymate.com/Galaxy_S4_ShootOut_1.htm#Table
[Galaxy S 4 General] slind:
One of this comparison pics was mine. And I had several S4 devices to test. They all behave the same way.

Tried that with three different units. In the most direct sunlight possible they increased brightness only a bit, not even remotely close to the ONE I'm afraid.
[Galaxy S 4 General] DocRambone:
No, i use s4 without any problem outdoors, its much brighter than 145cd/m2

The brightness is rather high, much brighter than my Note2 in same conditions.

In direct sunlight all screens have poor visibility.

In the shadows the s4 behaves as good as the htc one.

And my findings is that 6+ hours screen on in well lit (outdoor) conditions is rather normal.
[Galaxy S 4 General] slind:
Tested that on sunday and have to disagree completely. HTC ONE: Watching the VERGE Videos with sunglasses worked perfect in direct sunlight.

S4: Not even remotely possible without sunglasses. And the difference even in shady surroundings is very real.
[Galaxy S 4 General] DocRambone:
Lol, why would you look at videos in direct sunlight with sunglasses?

A more normal scenario is in the shadows and there the s4 behaves as good as the htc one.
[Galaxy S 4 General] slind:
Because it was still very enjoyable on the ONE and not as stressful on my eyes. Don't mean to be rude, but did you actually had the chance to look at S4 and ONE at the same time in the shadows? I really doubt that.

And a normal scenario for me would be in the park, at the beach, shopping outside etc. as well as in shady areas.

I still got both devices here for today, might do some additional photos to prove the S4s lack of brightness outside (in every situation).
[Galaxy S 4 General] DocRambone:
I have access to a htc one also and even if it brighter in direct sunlight, its not better in the shadows, high brightness is not the only factor, low reflectance is as important.
[Galaxy S 4 General] puremind:
Yes, we all read that, but unfortunately that only true outside of web browsing, where you mainly see more mixed conent The Displaymate reflectance tests were conducted on color patterns which had much dimmer average picture level and therefore do not create white clipping. Also correct me if I am wrong but I believe they used a market app. which does not have as much clipping as the browser for some reason (well we know it's to put down a good web browsing battery test...).

So the Displaymate results cannot be transposed to most Smartphone applications, such as texting, Whatsapp. GPS Nigivation, Web Browsing. In those situation white point brightness gets severely clipped and this is what we see clearly in all the pictures. That's exactly the problem.

Smartphone manufacturers have become incredibly shrewed and inventive when it comes to thwarting poor benchmark results. Measuring brightness and battery life used to be so simple. Nowadays displays behave in ways that most reviews do not have the time or patience to study, so it is easy to be mislead.
[Galaxy S 4 General] DocRambone:
I dont see that problem at all, white at max brightness in browser and other apps is the same.. as the whites in the system.

It may the stock browser that limits the light output. Did you try other browsers?
[Galaxy S 4 General] puremind:
This is correct. In the shadows or in dimly lit environments, eyes can adapt to lower brightness levels and therefore can recognize the better blacks of the AMOLED, and as a result the perceive contrast is higher.

Also at lower brightness levels, the S4 has got more accurate greyscale than at maximum brightness, because at maximum brightness the red diodes can't really keep up with green and blue (since it is dim color by nature, since red impinges on infrared and part of the energy is dissipated in the form of heat) and green ends up dominating the greyscale.
[Galaxy S 4 General] BoneXDA:
If it's a browser issue, why don't you use a different one?
[Galaxy S 4 General] Orical:
Personally it doesnt bother me, I've used both devices and though its preference per user I liked the way the S4 performed over the One.

If the screen were not at a governed state people would be complaining it wasn't and would be looking to change it and now it's out that it is and people are complaining anyways. Honestly you either like it and your looking to work with it like everyone wants in which everyone here does anyways but I agree either use it or don't and install something else.
[Galaxy S 4 General] BarryH_GEG:
OP's experience is tied to one or more of the following:

From GSMArena:

The brightness levels of the Samsung Galaxy S4 are about on par with the rest of the company's AMOLEDs, which is to say not very high. However, due to their low reflectivity, this doesn't affect outdoor performance.

Keep in mind that enabling the auto tone setting in the screen option limits the maximum brightness to under 300 nits

, so if that matters to you, you better keep it off.​

From DisplayMate:

Since the display often uses 50 percent or more of the total Smartphone power, various display power management schemes are frequently used. The Galaxy S4 uses one innovative approach to overcome this –

when Automatic Brightness is turned on, the Peak Brightness becomes significantly brighter in high ambient lighting than is possible with Manual Brightness, up to as high as 475 cd/m2

, which is 34 percent higher than is possible with Manual Brightness. This is done so that users can’t permanently set the brightness to very high values, which would run down the battery quickly.​

From Samsung:

Samsung Adapt Display:

The Galaxy S4 "learns" what you are viewing and adjusts the display's brightness accordingly

. If the phone senses you are reading an article, for example, it will illuminate from a more muted brightness.​
[Galaxy S 4 General] ap3604:
Thanks for bringing this up puremind :good:

I'll continue to monitor this thread and if this is the case (where the brightness is throttled in all web browsers with no means of fixing it) then I'll simply look more into the LG Optimus G Pro due to its removable battery and IPS display.
[Galaxy S 4 General] BarryH_GEG:
OP started a similar "expose" thread in the One forum that pretty much went nowhere as user experiences didn't jive with his assumptions/conclusions that the One used up to five different displays with brightness varying from 300-550 cd/m2. The part that was missing was the "smoking gun" which would be actual users reporting the same things that OP's observed.

As for this thread, this pretty much says it all:

Read the DisplayMate test. It's incredibly detailed and I'm pretty sure there's no subversive plot on Samsung's part to lead reviewers to false performance conclusions. DisplayMate makes the equipment manufacturers use to calibrate their displays and aren't affiliated with any OEM and their work isn't limited to mobile devices. They are the penultimate source of display information.

http://www.displaymate.com/Galaxy_S4_ShootOut_1.htm

The review's author has a Ph.D. in Theoretical Physics from Princeton University. His bio's here.

http://www.displaymate.com/about.html

Limiting brightness when the display's set to manual mode is kind of funky as historically higher brightness levels were achieved that way. On the SGS4 it's the opposite. Also there's no way of knowing what affect Adapt Display has on display brightness as it's "learning" a user’s behavior. And I wonder how many reviewers left "Auto Tone" on which caps the display at 300 cd/m2. There are a lot of display settings that can be manipulated on the SGS4 and there's no way of confirming which individual reviewers had active or disabled. It would also explain different reviewers reporting different results.

This is a thread OP started recently in the One forum. "I can't stop purchasing HTC One phones"
[Galaxy S 4 General] ap3604:
Barry being awesome as always :D

Thanks for the heads up for the great info on the OP and the displaymate review. Going to start reading it now :good:
[Galaxy S 4 General] puremind:
They won't believe it until they see it. Some of the pictures in my original post were actually in shadows (and even indoor) and at maximum brightness, and still they think their screen is "very bright" and they cling to the reflectance theory. But the reflectance theory is only valid with a direct source of light, so NOT in the shadows...
[Galaxy S 4 General] puremind:
I have measured both UI and browser white point brightness. The clipping happens everywhere, also in the UI. Browsing adds another 15% to that (but depends on the content displayed.
[Galaxy S 4 General] puremind:
I tested on both Stock Browser and Chrome. Those behave differently than other browsers (probably to fool web browsing battery tests). The clipping still exists in other browsers, but it is the same as in the UI, and much more limited (280cd/m² down from 350cd/m²).

You can see that in the shops, in the shadows and in the sun. This is only 50% of the One's brightness for this type of content (also wit Power saving off and maximum brightnesss), so you would have to be blind not to see the difference. :) This is essentially what you see in the pictures on the original post, which were taken in different situations.

Which browsers are you using? If you don't use Chrome or the Stock Browser, this will be less noticeable.
[Galaxy S 4 General] puremind:
Barry, you know full well that the thread you are quoting was to mock fanboys haunting our forums. Don't pretend you didn't catch the irony :)

Not everyone will get my humor, but since you are at it, you should also quote that thread from me (which was mocking trolls - just to keep things balanced):

http://xdaforums.com/showthread.php?p=40040818

That was for the unserious part. Now to the other thread you quote on the One's display. It has got 31 pages, 8 of which in the last week alone, si I don't think it went nowhere:

it explained and quantified how the display adapts to average picture levels

it established that there are two different types of color temperature and brightness/contrast settings

it established that the cooler calibration can vary between cool and very cool and that overall color temperature can range from 6470K to 8000K (inter-reviewer discrepencies aside)

. :good:

I have already explained why the Displaymate tests are not relevant to this discussion: the screen itself is not being discussed here, only how it behaves in real life situations that were not part of Displaymate's testing protocol.

Also, since you seem to think I am biased, I think you should know that I will keep the Galaxy S4 because I can see the potential of this device for the future thanks to the great work of devs like Andrei. I hope to be able to contribute to make the S4 a better device in the coming weeks, but for now I think this bit of fact finding is not uninteresting.

One last question for you to ponder: If Samsung managed to produce S4 units with screens that measure exactly the same from device to device, why can't HTC calibrate their unique JDI Panel to the same quality standards and have to use color temperature calibrations between 6340K and 8000K? In any case, as the good capitalist that I am, I will continue to promote information as "perfect" as it can be and raise awareness with the reviewers - you may not believe but most are actually grateful for the tips - and this will in turn help refine their testing in future reviews.
[Galaxy S 4 General] SirCanealot:
I actually noticed this on a unit earlier, but didn't think too much of it until I read through this thread just now. I was more like "lol, Samsung" and put the phone down.

This is the behaviour I noticed: When browser comes up, the brightness remains uncapped for about 500ms, then caps itself. When you press home button (or go into a menu, etc) the brightness uncaps itself about 250ms before going to the home screen. If you go back to the browser then the same thing happens — after about 500ms the brightness is capped. Is it the same timing for everybody else?

I have about 10 units in the shop I work in now (second hand, so I can test them fine). I also have a sister shop around the corner with over a dozen units. If anybody isn't convinced I can test units tomorrow to see if they exhibit the exact same behaviour. In fact, I'll definitely check at least 1 or 2 units and make sure I turn all of the power saving features off and see if it caps to the same level with all the different display profiles.

To be perfectly honest, I was very surprised at how far the brightness was capped and didn't think it would be bright at all enough for using in the sun (Note II with Mr. AndreiLux kernel with the modded max manual brightness is JUST good enough for conformable viewing in the moderate London sun). But I have a colleague with an S4 and as we've had some decent sun in London recently I will ask him what he thinks and if he's noticed it capping or not.
[Galaxy S 4 General] puremind:
This is exactly why I created this table here as a guide:

It took me almost 4 hours to get through all of the settings. They do not impact color temperature or color gamut, only gamma and maximum brightness (which is testament to the excellent calibration job conducted by Samsung). Irrespective of these setings,

Film/sRGB mode will always have the 6340K color temperature (too much green) and the slightly less saturated gamut at maximum brightness (note that measuring at lower brightness will improve the green push issue and essentiually yied perfect color temperature, it is just that red can't keep up with the other colors up to 300cd/m² and above)

The othe rmodes will always have the 6940K color temperature and the oversaturated color gamut

For better gamma, the Adjust Tone option should be on for film viewing, deactivating it creates higher brightness but at the expense of gamma tracking (black crush happens).
[Galaxy S 4 General] puremind:
Thank you, this is actually a very useful post. It should be noted that this does not only happens in the browser but is a general mechanism - when moving from content that has a lower average picture level to content that has a higher one. The display adapts so that the total (average) brightness does not go over a certain threshold.

However the mechanism is intensified for the Chrome and Stock Browsers. Andrei, are you able to find any settings that specifically target the Stock browser and Chrome applications? Are any other applications also targeted?

It is kind of a sneaky move by Samsung, because it clips just enough to pull off good web browsing battery tests with the standard Chrome and Samsung browsers but not for other browsers. Either way, it is good if people are aware of that so they can better adapt their web browsing to optimize the aspect that is more important to them: brightness or battery life.
[Galaxy S 4 General] puremind:
The throttling happens on all content, but Chrome and the Stock browsing have an extra throttling applied to them. To find out the throttled brightness for other browsers, you can use the "White UI" column in my table (original post). There is still some throttling happening, but this is much less detrimental to sun legibility.

Still interesting to know that you can choose a different browser in sunny environments. It will still be 20% dimmer than peak brightmess and but still readable in the sun (and HTC One will be 50% brighter than that, though probably 20% brighter would be enough for confortable viewing in the sun).

Hopefully one of the devs will find an option to deactivate the throttling in the Chrome / Stock browser - I find them faster and want to use them. I think the auto-brightness setting or one of the power saving options is enough to throttle brightness on purpose...I don't want this forced upon me.
[Galaxy S 4 General] puremind:
Barry makes some useful contributions, but in this case he may have been hasty and/or overzalous. I kind of take offense at the fact that he publicly questions my motives and integrity, especially since I opened a twin thead called: "My HTC One broke and injured me".

http://xdaforums.com/showthread.php?p=40040818

The hilarious part is the "My HTC One broke and injured me" thread was closed (even though many users congratulated me for the funny derisive tone), while the "I can't stop buying HTC Ones" thread was kept open. :) Neither were serious, they were just a fanboyism/trolling parody.

I will give Barry the benefit of the doubt and assume that he was not sensitive to my humour! :highfive: I felt it would be refreshing to see fanboyism/trolling go so much overboard that it becomes funny.