yashsingh1/xdaforums huggingface dataset:
[Nexus 9 General] GibsonSGJ:
Wow has anybody tried clearing the cache partition with 5.1.1? I started it and put mine down to go about my business for the typical 10mins it use to take, and I looked back and the frigging thing was done! In under a min!

---------- Post added at 04:25 PM ---------- Previous post was at 04:22 PM ----------

I cleared my cache partition and it was done in seconds. It use to take 5-10 mins.
[Nexus 9 General] paxderomano:
That's what I was afraid of. Nearly everything is cloud backed up, just had a few save game files I was hoping to salvage. Oh well.
[Nexus 9 General] WhammyDroid:
So far, it appears Google has address most of the memory issues I was seeing with 5.0.X. Specifically I could not listen to a podcast or music and try to surf the web at the same time. Doing the second activity would force android to kill the audio session. Extremely frustrating. I am also able to run a different wallpaper background without having bad performance issues.

Overall, the tablet now seems to function better. I still need to test having a video call via hangouts. However, it appears 5.1.1 to function better.

Lastly, I am seeing TWRP is not able to reboot the tablet. The app prompts me to confirm I want to reboot the tablet however it never actually happens.
[Nexus 9 General] fonetik:
I manually updated from 5.0.2 to 5.1.1 and it seemed to work fine. Booted properly and all that.

Then I remembered that I hadn't re-rooted it so I ran the root batch file that I've been using on all the previous versions.

After that, it rebooted and did the app optimization and got stuck in a loop doing this. I was able to use ADB to reboot into the bootloader.

I'm going to try re-flashing 5.1.1 manually, but I'm wondering if there's an updated root solution.
[Nexus 9 General] cam30era:
Install TWRP. Download SuperSU zip from here, on your SDcard >http://download.chainfire.eu/740/SuperSU/BETA-SuperSU-v2.49.zip

Then flash the zip in recovery.
[Nexus 9 General] Kubens1pl:
I'm also seeing that line. I don't remeber when, but sometime it happens... :-\
[Nexus 9 General] seanashmore:
It truly dumbfounds me how this device overheats with 5 minutes of browsing but can display video from both local and (more impressively) streaming sources for hours without the slightest bit of heat. Has anyone any thoughts? It's a shame that I have to flash a custom kernel and control the parameters myself in order to prevent this issue.

Is everyone else still seeing heat when browsing after 5.1.1? I flashed using factory image and did a full factory reset after first boot as userdata wasn't formatted (as it doesn't come with the factory image).

I guess I'm inclined to say it is a software issue because with elementalX the heat is minimized to gaming which will heat up any device at the best of times but even then there are some 3d games that don't heat up my N9, it's very odd.
[Nexus 9 General] cam30era:
I suspect it's something related to Chrome. I have a Surface Pro 3 and it runs very hot when browsing with Chrome, but not with IE.
[Nexus 9 General] androidtoy09:
For me, 5.1.1 has been a very noticeable improvement. Less lag, sluggishness. I'm happy with it so far :)
[Nexus 9 General] fonetik:
Thanks, that seems to have worked. I've never done it that way before.
[Nexus 9 General] fazbender:
I tested with Chainfire's autoroot and that worked. Followed by flashing TWRP. Same/same....but different. but same. ? .

---------- Post added at 08:24 PM ---------- Previous post was at 08:14 PM ----------

Second day on rooted stock 5.1.1 I'm on pace for 5 hrs SOT with heavy chrome ( CPU 2hrs ) Maps , messaging ( BT tethered for data ) mostly work, no vids/games . Mostly same/same.
[Nexus 9 General] shojus:
How is HTC being about warranty? My 9 has been acting strange and I just hate the amount of bleed I have! Thanks in advance!
[Nexus 9 General] bjacks12:
24 hours in and doing great
[Nexus 9 General] Ace42:
Since you're on windows you should just use chromium & not chrome. It's updated like every few hours & doesn't heat up my laptop with a 4200U (but it always stays under 50°C anyway).

https://commondatastorage.googleapis.com/chromium-browser-continuous/index.html

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[Nexus 9 General] velocity90:
Try Dolphin browser

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[Nexus 9 General] hdtvpower:
Nexus 10 vs 9 unbelievable

I bought the Nexus 9 in January as a replacement for my Nexus 10, which had reduced battery life to just 6-7 hours of use.

My Nexus 9 had a completely different launcher (phone style) vs Nexus 10s tablet launcher, less apps on a page etc. I used KK launcher as a replacement.

I was since waiting for the 5.1.1 update to unleash the power of the 64b chip. While waiting my front micro died and I was told to RMA the Nexus 9 a couple of days ago.

I unpacked my 3 year old Nexus 10 , charged it and started it. Within 10 minutes I got the 5.1.1 update and bam, the thing is running like hell. No redraws, many apps at the same time, speedier than my new Nexus 9, cooler. It beats it in most categories. I am embarassed, I believe we are really screwed with the Nexus 9. Something is fundamentally wrong with the concept or the kernel drivers or something. The difference is overwhelming and the Nexus 10 is years old. Help me, do I have to sell the Nexus 9 and buy a newer Sony Z4 or wth is going on here?
[Nexus 9 General] FrankBullitt:
The Z4 will have the Qualcomm 810. I was looking at it as my replacement for the N9 but judging from reports of the other 810 devices it will be even more screwed...

I fully understand your "pain" with the N9, I feel the same shame when I pick up my old iPad 2 running ios8.

Right now I feel tempted to wait for my repair (Google refused it under warranty, HTC said they'd replace my screen within the warranty... Go figure...), sell it and minimize the damage. That S3 is looking more and more appealing by the day :/

Edit: to clarify, I installed 5.1.1 before sending the 9 to repair. In those short hours of usage it felt much snappier than with 5.0.1. But still far from what a flagship should feel. I don't mind much the overheating because it's always in a case and that helps to hold him, and the redraws were less frequent... But still there.

It feels better, that's a given, but still far from the experience I'd expect out of it. I'm starting to believe that Android is not meant for tablets.
[Nexus 9 General] hdtvpower:
Share your feelings, just have to say that the Nexus 10 with 5.1.1 is running like crazy. Also saw some Samsung tablets, which are really doing their job. I still do not get the reason for this massive underperfomance of the N9.
[Nexus 9 General] AhsanU:
Ran it for a day, battery life didn't seem much better than CM12. But I was missing certain elements of CM12 or any non-OEM ROM like the clear all button in the recent apps menu and the ability to move the clock to the center. I guess I'm a bit more pedantic than most when it comes to these things. About to flash CM12 again - stock 5.1.1 isn't my cup of tea I suppose.
[Nexus 9 General] cam30era:
Thanks. I should have made that "past tense". Just sold the SP3. No "Windows" in my house anymore.
[Nexus 9 General] Rekzer:
Has anyone noticed that the tablet only charges quickly with the cable it came with. All of my other cables take forever to charge it, and those same cables fast-charge my Note4 in 40 mins...
[Nexus 9 General] doitright:
If you look at the code under the tegra kernel tagged for 5.1.1 and compare it to older tags, you will see that there have been some commits made in the interim. Not a whole lot though. They didn't bump kernel versions, just added fixes for hardware drivers.
[Nexus 9 General] stadicon:
I know, that's why I stated it's OpenGL ES instead of OpenGL. From what I know, Nvidia offers full OpenGL 4.5 on the Shield tablet, while this one only has OpenGL ES 3.1. Am I wrong?
[Nexus 9 General] doitright:
Web browser is running javascript written by retards that pegs your CPU. Video decode is done by the video decode ASIC, which is built into the "GPU" part of the SoC. The video decoder is extremely power efficient, all the CPU has to do during video playback is feed the raw data from where it is coming from over to the GPU. The CPU is more-or-less idle.

Considering that web browsing can cause CPU pegging and excessive heat on an actively cooled DESKTOP system, don't get your hopes up that it won't cause heat related throttling and heavy battery consumption on a tablet. This will continue to be the case for as long as websites are written by "designers" rather than "programmers" or "engineers" who actually understand the implications of writing infinite loops in javascript.

It isn't odd at all. Good dev writes software that is efficient and fast. Bad dev writes software with power sucking infinite loops.
[Nexus 9 General] cam30era:
Yup
[Nexus 9 General] doitright:
The SD810 is very well suited for a tablet, especially if sony did smart and put a big piece of metal in the back to distribute heat well.

Basically, the SD810 is 2 or 3 times as much CPU as the N9 has. I.e., it has 4xA57 (strong) cores + 4xA53 (weak) cores vs N9 has just TWO A57-class strong cores. 4xA57+4xA53 == 6xA57 maybe? -ish? (they can all turn on at the same time).

Qualcomm chips are also much better supported than Nvidia.

The big "issue" with the SD810 devices that are out there... is that they are phones. Small form, small battery, no way to dissipate heat. Kinda expected, since the A57 was never intended for use in phones... the ARM "big" cores have always been targeted to physically larger devices, like tablets. Qualcomm made its success on the likes of Scorpion and Krait, which are kinda-like the ARM "big" cores they are based on, but power (and heat!) efficient like "little" cores. They are doing the same pattern on the SD820, with 8 "big" "Kryo" cores. Perform like 8xA57, cool like <=8xA53.

---------- Post added at 03:44 PM ---------- Previous post was at 03:41 PM ----------

I have not noticed that.

But do be aware that there are a lot of different "quality" levels of cables. Having cut into a lot of them, some have such tiny little wires in them, that there's no way they'll carry the full current that the device is capable of consuming.
[Nexus 9 General] Hiro Nakamura:
Well you are the guy that goes with more cores more power :D but most of the apps can't use 8 cores to their full potential.

In fact the the single thread performance of the K1 is still better than the SD810 and graphics performance overall as well.

You know that samsung could manage the heat from their cpu while qualcomm couldn't. If only samsung would make their kernel open source >.>
[Nexus 9 General] FrankBullitt:
I hope you're right, I'm actually rooting for the Z4 to be "the tablet" so I can finally enjoy android on a big screen... Also worth noticing the rumors about the big 9.7'' galaxy tab S2 being a beast and having a "S6 like" build quality...

But I learned with the N9: don't buy a tablet before the first month of reviews. So I'll wait to see how the Z4 behaves on real-life situations and how well Sony handled the huge throttling that current devices using the S810 have in order to control the heat.

And again, every single review of that new Surface 3 make it more and more appealing as a productivity device... I feel so tempted to join the dark side of the force :P
[Nexus 9 General] cam30era:
FWIW: I just sold my Surface Pro 3. It's a great productivity device. But I wasn't comfortable with the scaling due to the high res screen. Yes, you can change text scaling, but buttons and menus remain a little too small for my fingers.

With Chrome browser I would often get a selection right next to the one I wanted in bookmarks. IE Metro resolved this issue, but I didn't like that browser.

Bottom line, spend a little time with a Surface before making the decision.
[Nexus 9 General] FrankBullitt:
Thanks, that is a good advice and something the reviews won't tell because they are too focused on how powerful the thing is or isn't.
[Nexus 9 General] cam30era:
Welcome. I know. That's why I wanted to provide that feedback.
[Nexus 9 General] Hiro Nakamura:
Your argumentation doesn'T make sense. Show me where the snapdragon is faster. You always make the excuse that it's build in a phone. So what? The snapdragon is been made FOR smartphones. If it throttles in all smartphones it is clearly the fault of Qualcomm. Even with full performance it is not better. You can look at anandtechs review http://www.anandtech.com/show/8933/snapdragon-810-performance-preview

In this review the chip is in a tablet and the benchmarkings aren't much better.

And what do you mean basing cpu on poorly written software. Do you know how long it took for PC's to take advantage of multicore?
[Nexus 9 General] velocity90:
Why do you have performance issues and mine doesnt? What exactly do you do!

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[Nexus 9 General] spicyalan:
I'm not disputing yout openGL/openGLes claims, but you are talking gibberish about the other stuff

This is not even close to be true.

You can run a geekbench on both processors without having the thermal throtteling kick in.

The best score I found for the S810 is around 1200. The Samsung score a bit higher to 1500. This is not even close to the 2000-2200 achieved by a Denver core.

In multicore mode, the 4+4 cores are indeed quicker than the 2 of the tegra, but that is not surprising...

The GPU in the K1 is still unmatched.

Also untrue. Next to having a completely different GPU, the Samsung is made on a 14nm process node. This makes it possible to achieve higher speeds at a lower heat dissipation. It also has a much higher memory throughput.

---------- Post added at 08:39 PM ---------- Previous post was at 08:30 PM ----------

I'm sure the SD810 is well suited for a tablet. It would certainly do well.

....but Denver is

not

A57 class. It is a custom core that runs its own microcode. It contains an ARMv7 and ARMv8 decoders to translate the instructions (technically, it could be modified to run X86 code, just like ARM). This core is closer to a Transmeta processor (2004 called and wants their processor back...) than to a modern ARM processor.

It does have it's own problems however, but raw core performance is not one of them.
[Nexus 9 General] Dr. Hurt:
Can we please get back to the nexus 9 and 5.1.1?!!

A day with the update and I'm completely underwhelmed. It'd definitely smoother than 5.0.1 but no where near what a device with such specs/price should perform.

I still get launcher redraws, tab reloads, and occasional chrome freezes!!

Today is the first day I regret getting this tablet. $479 put to waste.
[Nexus 9 General] Philaphlous:
Thread got stolen by Qualcomm engineers... Oh wait.. No engineers here. Nevermind.

I get redraws after 3 tabs open in Chrome. This is a major os issue. Either the app isn't provisioning enough memory or the os needs reworked.
[Nexus 9 General] Koblek:
The cable can impact the current that the device can draw for charging, but the power source also influences how quickly it will charge. The 1 amp charger that came in the box will charge it a lot faster than just a USB port on a computer. I got a 2.4 amp USB charger and it just charged from 15% to 81% in 2 hours.

http://www.amazon.com/gp/product/B0073FE1F0/ref=oh_aui_detailpage_o00_s00?ie=UTF8&psc=1
[Nexus 9 General] Ace42:
Mine is showing over 10hrs to recharge. :D

The Nexus 9 is truly the weirdest device I've ever owned...
[Nexus 9 General] Macbook386:
i have to say all in all i'm happy with the update. better performamce and everything is a bit smoother.

but today i listened to music and used chrome. suddenly music fc's and i got a launcher redraw.

now using chrome dev channel and it doesn't seem to slow down the device as much. could be me but i think it performs better than the stable channel.... time will tell :)
[Nexus 9 General] borchgrevink:
Does this happen with other browsers as well?
[Nexus 9 General] foxmeister:
All in all, I'm pretty disappointed with this update.

Proper multitasking (as far as I'm concerned anyway) still isn't really possible due to the over aggressive process killing that has plagued this device ever since I've had it. I'd really hoped that 5.11 was going to fix this, but sadly it really doesn't seem much better than Android 5.0.

My Galaxy Tab S was updated to Android 5.02 the other week, and it multitasks like a boss. I know it has 3gb RAM, but still 2gb should've been enough to keep a handful of apps open at the same time.

Other issues, that still haven't been fixed include:

1. Citrix Receiver - not connecting with a "General Error"

2. Amazon Workspace - not connecting 9 times out of 10, and when it does it is painfully slow.

3. Inability to open most, if not all, files download via the "Downloads" app or from the notification bar.

Tried a complete system wipe, which wasted a lot of time and didn't help either.

All of these are fine on my Tab S.

For my usage case, the Nexus 9 simply doesn't work as required - it didn't when I bought 7 months ago, and still doesn't today.

I'm really beginning to believe that Google screwed the pooch when they chose the Tegra Denver SoC for this tablet.

Worst tablet I've ever owned, and I've owned an awful lot going back to the very original Samsung Galaxy Tab!

Regards,

Dave
[Nexus 9 General] Al-Azraq:
Chrome has always been a great battery drainer and heater both for tablets and phones but it has improved drastically since some versions ago although in this tablet the battery consumption is still heavy, very heavy. This happens because of the CPU governor, which is very aggressive, and increases the CPU speed up to 1.500 mhz every time you touch the screen. So in a activity such as browsing where you are always touching the screen, this leads to a extreme battery consumption and heating.

It does not make sense this way to manage the Mhz of the CPU. Google should improve this.
[Nexus 9 General] toopy:
Really disappointed in this update and well now this tablet in general.

Since update chrome crash's regularly just from browsing, chrome beta won't even open.

Tablet decides it wants to reboot randomly.

With that, the battery drain, screen redraws, tab refreshing, felxy back, no opengl4.5, limited capacity and memory, inability to connect and mount an external HDD and SD card simultaneously (I believe that a custom kernel can fix this?) And whatever else I'm just going to by a surface 3 now that the base version runs windows and basic apps.

Held out for months in the belief that Google couldn't leave their flagship in the state they did at launch and understood that it's 64bit etc and coding etc but this is just $%#@ing ridiculous. Its even worse than 5.0.1 stability wise.

I'm done
[Nexus 9 General] y2whisper:
First off I enjoyed the debate on Denver vs SD810 sure 60% of it went way over my head but its way better of a sidetrack then when people start giving the "N9 sucks that is all" type of posts that are negative but with no examples why.

Frank, I kinda like the Surface pros as well. the 2 was too expensive. for me the things I would want is play books (which i think u can do in a browser) and some way to cast my screen when need be.

5.1.1 has been pretty good for me, but I don't do a ton to test it, should try loading up a game. I agree that chrome and this thing still seem to be a poor match even if its supposed to be geared to a 64bit device. I also use javelin may give opera a whirl. I just use chrome for the sync functions.
[Nexus 9 General] Rekzer:
I did the upgrade and its smoother, and I think the battery is better...but its definitely memory starved. Really disappointing in this device..we were basically sold a device that cant multitask.
[Nexus 9 General] Ace42:
The Surface line has brought Apple-tier build quality to Windows, and I guess only Sammy can do that for Android. I've used only the RT based Surfaces & they excel at battery life despite having Tegra chips. The N9's battery life is under the RT & Surface 2, which is disappointing.

I'm not convinced yet by the S3 (need to try in person), but the SP4 with Broadwell might replace my N9 if announced with a reasonable price.
[Nexus 9 General] Philaphlous:
Maybe I'm a little obsessed with performance but what is everyone getting as far as performance goes on 5.1.1?

That is pure stock.
[Nexus 9 General] velocity90:
Dolphin hd browser!

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[Nexus 9 General] Ace42:
That is mostly what I get on DU, but single-core is 2105 & multi 3518. Multi is always 34XX-35XX & single floats between 18XX-21XX.

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[Nexus 9 General] inick73376:
Any update on the N9 LTE getting 5.1.1?
[Nexus 9 General] velocity90:
Yes, lets ask that question again

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[Nexus 9 General] tgyberg:
:cyclops:
[Nexus 9 General] Rox598:
The tab reloading has gottem better but still happening which is just a joke at this point.
[Nexus 9 General] reggie14:
Mine come in around ~2000 for single core and ~3500 for multi-core as well.

The unfortunate thing is that despite those benchmarks, my Droid Turbo (1000 single-core, 2800 multi-core) is more consistently responsive. When the Nexus 9 is working well, it's fast and responsive. But after a day or so of use I get occasional slow-downs, just as others have described. I don't have that problem nearly to the same extent on my Droid Turbo (although I get random force closes a lot more on that).

The 5.1.1 update seemed to be a huge improvement at first, but I think a lot of it was just from doing the reboot and clearing the cache from the update. It's not particularly more responsive now than before the update, except that the animations seemed to have been sped up (which doesn't mean the tablet was any faster- Google maybe just changed the animation settings).
[Nexus 9 General] Ace42:
The Tegra is great for benchmarks, but for normal usage it operates on a tight memory budget compared to other devices. I question how seriously Google or Nvidia tested the 9 prior to release because someone must've noticed the poor multitasking ability next to a N7 2013 or another Nexus. When Android M releases Google should have these problems solved.

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[Nexus 9 General] FD_:
According to some of the reddit users that participated in the Chrome for Android AMA, this seems to be a general problem of Chrome on Lollipop (https://www.reddit.com/r/Android/comments/35v8gi/we_are_the_chrome_for_android_team_ama/cr85t5g). Some other devices running Lollipop seem to also be affected.

I personally cannot tell whether the problem really is connected to Lollipop, my Note 8 that runs Chrome better than the Nexus 9 is on Kitkat.
[Nexus 9 General] octagonPerfectionist:
i've been using mine on stock OS since the 5.1.1 update and my experience has been generally positive. things are much faster, multitasking isn't as shamefully awful (though still not great) and i don't run into nearly as much (though still a little) of the incredibly infuriating and headache-inducing screen flicker at lower brightness levels. honestly the only reason i like this tablet at all is the 4:3 aspect ratio, which is something that practically no other tablet manufacturers seem to believe in, even though 16:9 is totally ridiculous for tablets meant for anything but media consumption.
[Nexus 9 General] toopy:
anyone know of a class action against google for the nexus 9, 2 reboots in 5mins this is just absolute bull****. Only want a refund but the amazon window closed 4 months ago. (while waiting out for 5.1.1)
[Nexus 9 General] Ace42:
There is only a petition, but why'd you wait 4 months for a refund? The best you can do is sell it, since it's unlikely that a lawsuit would be successful.

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[Nexus 9 General] toopy:
Because I (stupidly mind you) held out in the belief that google would come through with the goods and fix their f-up

Never mind, told Amazon chat I was pissed off, the tablet was faulty by design and google have failed to deliver on their promise to fix it with an update and they issued me a refund.
[Nexus 9 General] Ace42:
Are you serious about the refund? I got mine from Amazon, and your luck has me interested lol.

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