yashsingh1/xdaforums huggingface dataset:
[One (M8) General] Pyromancer:
So if serial no starts with Fa = good ; Sh = bad??
[One (M8) General] n1234d:
I don't think there is any relation with the s/n This is my 2nd m8, and compared to the Samsung unit on my m7 and my first m8, the Sharp unit on this looks brighter and whiter (or cooler, I guess). The colors look satisfying and the panel is bright enough to read under direct sunlight. Guess I got one of the good ones :)

S/n : HT45MWM

Gunmetal, lighter variant.
[One (M8) General] Pyromancer:
So its a total luck of draw? :( is there any way we can understand if its bad or not before we purchase? How do we even understand after we buy?
[One (M8) General] n1234d:
Before, you can't.. After, you could just compare it with other devices you have.. You'll know instantly. And then you have the 14 day exchange period that you can take advantage of.
[One (M8) General] mfractal:
Serial FA43TW, sharp panel NT35595. Dev edition bought directly from HTC website.

very happy with the display. good color reproduction, white levels and brightness.
[One (M8) General] AsterFenix:
Seems like sharp display is better than the other display. Is there any app on the Play Store that I can use to quickly identify the LCD panel version? I'm in the market for a 2nd hand HTC One M8. Prob I will have time to fool around before decide to buy the device form the guy. If I can quickly read the panel version and decide, it will be very helpful.
[One (M8) General] n1234d:
There are two Sharp panels, with the exactly same code, but one is superior than the other. Only way is if you notice that the screen is yellower than what you're used to and isn't very bright. The good panel is very easy to read under sunlight at full brightness
[One (M8) General] SolarTrans:
I'm so glad I got the good panel XD

It's a real shame that there are two panel types with one being vastly superior, though. Reminds me of the OPO yellow band issue... Not good.
[One (M8) General] pedyvirus:
well i dont know what my display is but white collor is white (compared it to iphone 5s) and i cant read everything easily in sunshine with full brightness

im really happy with my m8 but sadly i cant root/s-off/convert to gpe for now
[One (M8) General] th3:
So which one have I got? SH43NWM04812

Some pics from my daily runner Desire S vs. the M8 (full brightness, early morn., non-lit, indoors):

http://i57.tinypic.com/2s17y1c.jpg

http://i59.tinypic.com/kearrk.jpg

M8: I hate the huge saturation in Gallery when viewing pictures. It's so overdone, it's worse than on the first Desire (!!) and something makes the darker areas so hard to see (?) - the skin tones are way off from what the picture actually is like. Photos and videos are showing as far darker on the M8 than my laptops or my DSLR or my Desire S. What is this?
[One (M8) General] AsterFenix:
I thinnk I should bring my Ipad Air as the reference display before choosing one then. Hope I will get the better panel.
[One (M8) General] Rainy_day:
Sharp panel , terrible panel !

Hi

My panel ID : Panel Name = m8 1080p sharp/NT35595 cmd mode dsi panel

Unfortunately if I follow your dividation my display is type-A (BAD one) . (Of course it is bad only in compare with some m8 I've seen so far like this : http://www.techspot.com/articles-info/801/images/OneM8S-7.jpg)

I've use ElementalX 4.05 and Kernel Auditor for set-up calibration settings . My favorites values are RED & green 252 and BLUE 256 . It reduce yellowish tint efficiently . But my big problem is OverSaturated RED ! it's very untrue and too much . I think RED GAMMA calibration by factory is terrible too . I'll attach a good video about this problem very soon between G3 and My M8 . You can discover a lot through the comparison .

*
[One (M8) General] Sunspark:
Hi,

From last.kmesg, I see that I have mdss_dsi_m8_sharp_novatek_35595_1080p_cm

Research shows that there are actually 6 combinations of panel/controller for the device, of which this is one.

5.0-inch SHARP-R63311_FULL_HD (SHARP + RENESAS)

5.0-inch SHARP NT35595 FULL HD (SHARP + NovaTek)

5.0-inch SHARP NT35695 FULL HD (SHARP + NovaTeK)

5.0-inch LG-RENES-R63311_FULL_HD (LG + RENESAS)

5.0-inch LG NT35695 FULL HD (LG + NovaTek)

5.0-inch LG NT35595 FULL HD (LG + NovaTek)

This specific LCD is LS050T1SX12 (K) and you can view the specs at http://www.panelook.com/LS050T1SX12%20(K)_SHARP_5.0_LCM_parameter_24726.html

This is the one that is more "blue". I can't say that I love it, because I find the viewing angle a bit on the narrow side, and I find that it has a bit of "shimmer" in the background. I wanted to say pulse width modulation, but it's not obvious and I don't have a high speed camera to check. Might be temporal dithering which is unnecessary on an 8-bit panel. Could even just be bad video drivers. When I looked at the gradient at lagom.nl I could see that there was banding on it that other devices didn't show the same way, and on ios and other devices, people have complained that when drivers change the image changes subtly and eyes get tired.

This M8 makes my eyes tired, maybe I just need to get used to it. I am suspicious however that this is one of the devices that my eyes don't like. Possible it is related to polarization. Will be interesting to find sunglasses or something and see what happens.

---------- Post added at 12:50 AM ---------- Previous post was at 12:26 AM ----------

So this "New Mode2" technology from Sharp,

"Power consumption has been reduced by a factor of 5-10. By contrast to the conventional system where TFTs are continuously driven for each frame, smaller TFTs and high Off performance enable a new system, where driving is halted if the display doesn't change.

Using this high Off performance in a touchpanel also gives the touchpanel high performance. By touch-detecting while the liquid crystal panel isn't being driven, and halting the touchpanel while the liquid crystal panel is being driven, touch signals can be detected without noise from driving the liquid crystal panel. This greatly improves the detection precision of touchpanels."

This is interesting, because I read the HTC had good touch response time. The implication with the paragraph above also implies that the LCD isn't being driven.
[One (M8) General] Zile995:
I have LG+NovaTek :)

HK version, 2.457GHz
[One (M8) General] Maedhros:
How did you get this?

I'm typing this in terminal emulator:

- SU

- dmesg|grep -i panel

Not returning anything. I have root.

This is what it returns:

1|root@htc_m8:/ # dmesg | grep panel

dmesg | grep panel

<6>[ 872.306530] c2 371 [DISP] htc_m8_panel_power_on: en=1

<6>[ 872.326101] c2 371 [DISP] htc_m8_panel_power_on: en=1 done

<6>[ 872.494041] c0 371 [DISP] mdss_dsi_panel_on:-

root@htc_m8:/ # dmesg | grep -i panel

dmesg | grep -i panel

<6>[ 872.306530] c2 371 [DISP] htc_m8_panel_power_on: en=1

<6>[ 872.326101] c2 371 [DISP] htc_m8_panel_power_on: en=1 done

<6>[ 872.494041] c0 371 [DISP] mdss_dsi_panel_on:-
[One (M8) General] v-b-n:
Do grep on /proc/last_kmsg
[One (M8) General] Maedhros:
It says... can't execute: permission denied

EDIT: went into /proc/last_kmsg manually

found this:

mdss_mdp.panel=1:dsi:0:qcom,mdss_dsi_m8_sharp_novatek_35595_1080p_
[One (M8) General] puremind:
Can you find a line that contains "PANEL_ID" or "panel ID"? Last year this was the row that contained the display type.

It looks like what you have found by looking for a "Sharp" occurence is correct but just to be sure.
[One (M8) General] n1234d:
Hi [MENTION=853050]puremind[/MENTION], is there any way to ensure that you're getting a good display? Or is waiting for them to rectify the only option?
[One (M8) General] Maedhros:
mdss_mdp.panel=1:dsi:0:qcom,mdss_dsi_m8_sharp_novatek_35595_1080p_cmd

Panel Name = m8 1080p sharp/NT35595

Couldn't find anything referring to Panel ID in my last_kmsg, sorry. The above two were the only two lines that seemed to indicate panel name.
[One (M8) General] puremind:
What is your feedback on the screen? Would you say for example that blinkfeed looks a bit pastely and the white on green font is a bit hard to read (lacking contrast)?
[One (M8) General] puremind:
[MENTION=1144067]hamdir[/MENTION] Well, right now we don't have a good feel for the proportion of good vs. average displays. It could also be down to factory calibration.

My serial number starts with SH (SH433WM04964). So if this is factory calibration related we should be able to find out via the serial number.

HTYMDAABBBBB

HT = Vendor HTC--> Hsinchu, Taiwan or SH = Shanghai, China

Y = Year (3 = 2013)

M = Month (hex 1...C = 1 - 12 months)

D = Day (hex 1...9A..Z = 1 - 31 days)

B = Identification Number

Based on this my phone was produced on 3rd March 2014 at the Shanghai factory.

When I am back in Germany next week I will measure the good screen to better identify the different characteristics and I will also check the serial number.

Note that applying the update did not change the chracteristics. And I don't think this is not calibration related, because the differences are too visible. I don't think this can be considered something that needs to be "fixed" from HTC's point of view as the screen is still good, but it is not S5 good. An ANSI contrast of only 1000:1 is average nowadays. The best laptops and LCD smartphones (LG G2, Asus Padfone Infinity A86) out there go above 1,400:1,
[One (M8) General] n1234d:
So all the screens are good, just miscalibrated?
[One (M8) General] puremind:
No

One is good and one is average. The average screen cannot be improved with calibration because contrast is limited at 1000:1 and the white balance already has too much green (in an attempt to push contrast to 1000:1).
[One (M8) General] SolarTrans:
Do we know if there's any more/less consistency in certain carrier/unlocked/GPE/developer variants?
[One (M8) General] cheno1115:
M8 developer edition.

Ignore the low screen temperature. Lux auto brightness lowers the temperature when it's in night mode..

Serial FA43TWMxxxxxx
[One (M8) General] kremer4:
If anyone has both display in front of them try this, not sure which one is the good one but I had 2 different HTC One m8 screen since I had to return one for crackling speakers.

The 1st one I could not see the screen with my polarized sunglasses. On my replacement I could see the screen fine with the "same" polarized sunglasses. And yes the brightness was up all the way on both.

Note: Both M8s were the Verizon version
[One (M8) General] Maedhros:
My serial is:

FA43FWMBBBBB

So it was made March 2014? For the record, absolutely zero build quality issues with the device.

As far as screen impressions, I don't really notice any difficulty distinguishing white from green, however my eyes might just have adjusted.

As far as overall screen impressions - it certainly produces yellowish whites IMO. I can take some comparison shots with an Iphone 5S later if that would help.

Anything specific you would like me to take shots of?

I compared my device to another in store and the displays looked identical.
[One (M8) General] puremind:
Today I went to Carphone Warehouse at Oxford street long near the Tottenham Court Road Station and they had the average display. I don't think the serial plays any role because the serial of the one in the shop as:

HT43JWM05735

Calibration was only marginally different but it was definitely the same panel. I am now impatient to be back in germany to be able to post a picture of both screen next to each other. It was night and day. I won't be able to root the device to find out the panel name, though...but at least it will give an indication of the differences.
[One (M8) General] Maedhros:
I have a feeling my unit is the "average" display. It is far from amazing, but is nice none the less.

Is there no way to check last_ksmg without rooting?
[One (M8) General] Jiyeon90:
Found this and if you ask me the Z2 and S4 seem to have slightly better displays

http://m.imgur.com/a/6P58M

Sent from my Xperia Z1
[One (M8) General] Maedhros:
I took some comparison pictures between my m8 and my Iphone 5S : http://imgur.com/a/t8UNz

They probably won't reveal much, since the camera most likely distorted the pictures, but it's better than nothing.

To my eyes, both displays looked similar, but for some reason HTCs looked yellowish inside of sense. I'm not sure if that is just the pallet they choose, or an issue with the screen. The whites look fine when viewing sites such as google or engadget, verge, etc.
[One (M8) General] aim1126:
The only issue I'm having with my phone is that black levels seem to be really poor on my display. Specially compared to my old iPhone 5s
[One (M8) General] replica9000:
Just ran the cat /proc/last_kmsg | grep panel on both of my M7 and M8.

From my M7 (4.3.1): PANEL_ID_M7_SHARP_RENESAS_CMD

From my M8 (4.4.2): m8_sharp_novatek_panel_on

I can say that the contrast is better on my M8.
[One (M8) General] saydam:
is this the same problem?

Ps: sorry I cant paste youtube link, because of New user.
[One (M8) General] puremind:
I tried but couldn't open it or send it via email. Yes the average display has worse black levels.
[One (M8) General] puremind:
I won't be the case. HTC can't cherry pick based on display, it doesn't make sense economically. So color , edition or carrier would not make a difference. Only luck.
[One (M8) General] SolarTrans:
Yeah I understand.

"Buys 5 M8s to find best display" XD
[One (M8) General] Maedhros:
Honestly... i just went to a few different Rogers stores around my house, and the phone displays all looked pretty much the same.

Maybe North America only goes Sharp displays?
[One (M8) General] SolarTrans:
That's very possible. Explains why there haven't been any complaints in the reviews I've read.
[One (M8) General] puremind:
Anandtech complained about the screen. Some reviews have the good display others have the average one. I can tell only looking at their pictures. The JDI display tested by Anandtech last was better than this year's display.

The fact that many reviews didn't complain is also due to the fact that not everyone is as picky as Anandtech. Most sites only look at brightness and contrast, and since the display uses dynamic contrast enhancement most reviewers fail to measure the actual contrast of the screen...so they can't really say it is average...
[One (M8) General] puremind:
This review has the JDI screen:

http://www.techspot.com/review/801-htc-one-m8/page2.html

And it has good reviews plus the photos show that the contrast is very good.
[One (M8) General] Maedhros:
Well, I'll wait for someone to post comparison shots between the two devices. If the difference between the panels is really as huge as you make it sound... well then f*ck HTC...

I returned my One X because I got the inferior display, and avoided the M7 for a similar reason. I am really tired of HTC pulling this ****.
[One (M8) General] SolarTrans:
I agree. Apple has 2 suppliers for mini Retina panels, but they change some other stuff around so they are indistinguishable.

How come HTC can't do this??
[One (M8) General] Maedhros:
No idea, but as far as I can remember HTC has always had this problem. Two displays, with one being clearly inferior.

It is frustrating as hell.

Don't get me wrong, I'm a HTC fanboy... I've been using HTC devices since the good ol' WM days. But this **** isn't acceptable... its pretty much a bait & switch. Reviewers review the good screen, consumers get the crap ones.
[One (M8) General] SolarTrans:
It really is a big issue. It's not like they sell a lot of phones, so why not just have one screen manufacturer?
[One (M8) General] theukmaster:
Is it better to have the one with the yellow tint or the other one?
[One (M8) General] SolarTrans:
Without the tint.
[One (M8) General] theukmaster:
Cool. Mine does not have the tint. I seen one in the store that does have it.

Sent from my Note 3
[One (M8) General] puremind:
OK, I finally couldn't resist and rooted my phone. My bad display is the SHARP.

One review with JDI was positive. Last year all reviewers got the JDI display and reviews were more positive. The downside is I am stuck with adb not working (device offline) in spite of USB debugging activated and latest HTC drivers...I wanted to S-OFF to remove the tampered and now I am stuck as I cant even run firewater...
[One (M8) General] AnDruid:
adb device offline occurs because of older adb versions. You may need to download the latest one.
[One (M8) General] Maedhros:
How do we even know that the unit in the review is actually a JDI display and the guy from that review isn't just saying JDI based off of what HTC reps told him? (i.e. same panel as last year, so he assumed JDI?).

Like I said... I've checked out 4 or 5 store units around me and the displays were exactly the same. So far everyone appears to also have a Sharp unit.
[One (M8) General] cheno1115:
Yeah, So far I haven't seen a screenshot (or exact line of code) of the last_kmsg screen ID of a JDI display...

Anyone for certain have a JDI display?
[One (M8) General] StickyGeko:
I have an issue with my replacement m8....I get screen flicker when pinching and zooming or double tapping which is most evident in the camera and gallery apps....flicker is how I describe it....but it's kind of a redraw.... I'm uploading a video to YouTube and will attach it shortly
[One (M8) General] supercurio:
Hello puremind and guys!

Thanks for your effort measuring displays ;)

Erica Griffin pointed me here as she noticed you were using my old pattern generation app, and it's pretty obsolete now.

Since I work on a new project that allows fully automated mobile display measurements, with smarter patterns that fight against several kind of dynamic contrast implementation I observed that there was a bug in the saturation generator in the old app.

Because using the generator app manually is very slow and frustrating, I deprecated. Instead, there's complete color science algorithm and even an original calibration profile generator in my new software, that I describe in this Google+ community and blog about on Google+

Sorry it's been a long time I posted on XDA about all this, lately I was only focusing on pure R&D to bring out new stuff and not being distracted.

I just updated the voodoo screen test patterns app description on Play Store describing the bug: the saturation points are not placed linearly.

If you really like this app an rely on it I suppose I could push a last update with the RGB value fixed so let me know.

I assumed nobody was using it given the absence of feedback but it seems not :D
[One (M8) General] puremind:
I remember seeing information about JDI for HTC One M8. I went to 4 shops today and they had worse screen than mine. Close and similar but slightly bluer.
[One (M8) General] StickyGeko:
http://youtu.be/7YpAOKHvAZ4 does anyone else get this? Look at the lower half of the screen ((((admin if this is in the wrong place please move it to where you feel it should be))))
[One (M8) General] puremind:
I used the one with constant APL that you had posted to me to measure the true contrast (which wasn't posted on Google Play). I really like it.

I know you had been working on the automated app and I went to the Google + initiative but I only found stuff related to Nexus devices.

Overall I still think the gamma is on the low side and the colors are not very accurate on the lesser display of the two and the contrast is just average. If you or Erica have a better device would love to see the measurements.
[One (M8) General] supercurio:
Oh hi! Haha it's you :)

I didn't made the link from your nickname.

Yes I'll be interested in the math formula you're using to calculate the APL by the way, while looking at diverse strategies to fight dynamic contrast as not every device is calculating average brightness the same.

Specifically I was thinking about linear vs gamma-corrected calculations.

I'll have a new build soon of the network colorimeter app with automated measurements so let me know if you're interested trying that.
[One (M8) General] Maedhros:
Nope, I don't see that redraw on my device.

Can you check to see which panel you have?
[One (M8) General] StickyGeko:
I'm not rooted....how would I check which panel it is
[One (M8) General] puremind:
I don't see the flicker but I see the dynamic contrast algorythm kicking in to adjust the brightness to a different Average Picture Level when zooming and dezooming.
[One (M8) General] puremind:
last_ksmg file in the proc folder of the root. view in a test editor that allows a searc, e.g. Polaris Office and then search for the word "panel"
[One (M8) General] StickyGeko:
Can't find it...
[One (M8) General] Maedhros:
If you are rooted, can you copy and paste the file and upload it here or somewhere else?

Thanks
[One (M8) General] StickyGeko:
Sorry I'm not rooted, wanted to make sure the phone was spot on before rooting
[One (M8) General] Maedhros:
Can you follow these instructions and look for "sharp" or "JDI"?

http://xdaforums.com/showpost.php?p=39466772&postcount=5
[One (M8) General] StickyGeko:
I've tried.... It won't open the file... Keeps giving an error
[One (M8) General] Maedhros:
Can you try using ES file explorer, and when it asks you to open, select the ES note editor.

---------- Post added at 11:58 PM ---------- Previous post was at 11:51 PM ----------

Can you check what panel your device has?

Check the last_Kmsg

Thanks

For what its worth, I can see my screen using my polarized ray bans.

Can you check which screen your unit has?
[One (M8) General] StickyGeko:
Maed.... Still doesn't work :(
[One (M8) General] puremind:
You need to root your phone
[One (M8) General] puremind:
Yes network enabled would be great. Some algorithms count row averages. I use an app from the app store to determine the APL of any picture
[One (M8) General] Maedhros:
I guess puremind is right and you must be rooted.

Looks like there is no other option this time.

EDIT:

Can you temp root and check it?

http://xdaforums.com/showthread.php?t=2699089

You won't need to unlock boot-loader, so it should not affect return status or warranty as far as I know.
[One (M8) General] puremind:
This didn't work for me, as I have the international variant. What I did was S-Off in the end to removed the "tempered" flag and relock bootloader, as I am sitll not sure if I will keep the M8.

I purchased the S5 today (it was always planned that i would get 2 smartphones, just not sure the M8 will be my second one) and the display is very readable in the sun. Only disappointing part is the primaries are still oversaturated in film mode and the auto-brightness is too dim for indoor viewing.

Still the auto-adapt mode does a great job in videos. I suspect the auto-adapt mode to adapt colors for video content only. I would have to measure the screen using video content instead of an app...

The S5's screen is overall nicer to work with. Looking forward to the Z2 as many early reviewers mentioned that it is gorgeous.
[One (M8) General] DigitalMadness:
I had mine next to a Z1 and my looked much cooler/blueish. The Z1 was terribly yellowish :S
[One (M8) General] robt772000:
Had mine next to my dad's M8. His was a lot less yellow. And brighter.
[One (M8) General] replica9000:
Mine has a small amount of light bleed at the bottom. Wouldn't notice it if I was still using the nav bar. Only stands out when using something all white, such as Hangouts.
[One (M8) General] Maedhros:
Are the phones rooted? Could you find the panel types?

Could you provide some comparison shots? And when you say his is a lot less yellow, can you qualify that? What does a lot less yellow mean? Compared to what, etc, etc etc.

I've been anxious to find this mysterious JDI panel, and you seem to be the only hit so far.

BTW, can you tell if the yellowness of your screen decreases over time? Could it simply be the glue that supposedly must settle on laminated displays?

---------- Post added at 01:04 AM ---------- Previous post was at 01:04 AM ----------

Can you find out what panel your device has?

Thanks
[One (M8) General] replica9000:
If you need more info, let me know.