yashsingh1/xdaforums huggingface dataset:
[Nexus 9 Q&A, Help & Troubleshooting] FrankBullitt:
Stock 5.0.1, unrooted, chrome, google play music, sheets, docs, drive, keep, inbox, hangouts.

Oh, and occasionaly some google maps, g+/photos.

There, explain me how my daily "wtf, why is this stopped... oh, it's rebooting itself" is caused by my bad software usage.

---------- Post added at 04:36 PM ---------- Previous post was at 04:34 PM ----------

Oh, ****, wait, you are right, I installed a weather app from google play store and also the NBA app.

Those damn dev bastards who ruined my N9!!

EDIT: my usage was not always this one. I've also used it for gaming (real Racing 3, Limbo, etc), multimedia (Plex, ArchOS for smb streaming), and many other stuff. It was unbearable to be in the middle of something and see "unfortunately XPTO app has crashed", and the overheating, the lag, etc etc... some kernels and custom roms helped a lot at first but after a week of usage the same behavior would be back... So it's now a very basic usage device. I actually use my N4 for almost everything... even to remote desktop to my home servers (coupled with a chromecast that I plug wherever I can).

And still reboots out of nowhere, in the middle of nothing, while draining battery like a athlete on steroids.
[Nexus 9 Q&A, Help & Troubleshooting] KingVeto:
While I do love my N9, the wait for updates is absolutely unacceptable. This is supposed to be a flagship Google device and the flicking Nexus Player gets updated before our tablet? Come on Google, support the people who support Google. Get it together.
[Nexus 9 Q&A, Help & Troubleshooting] tgyberg:
Ouch. I would be pissed as hell too :eek:
[Nexus 9 Q&A, Help & Troubleshooting] lucena:
Considering buying n9

Hi I'm considering buying a N9, since I like stock android and really dislilke ios. I have a N4 that is still doing fine for my usage (social media, browsing, email...) and suppose i would like the n9, but i've seen quite a few comments on it having bad performance. How is it doing after the 5.1.1 update?

I intend to use it for viewing docs/pdfs, email, browsing and watching videos, nothing too demanding, I don't usually play games.
[Nexus 9 Q&A, Help & Troubleshooting] cam30era:
Those are all working very well on mine. I've not had a problem. I also don't play any games.
[Nexus 9 Q&A, Help & Troubleshooting] johnbrighton:
On the whole, I've really enjoyed using my N9. Yes, there have been problems, but then there always are with new hardware and software.

The tablet is great, especially now with 5.1.,, it's a great size - which I see sammy are now copying after everyone slagged off Google/HTC for producing a tablet with 4:3 screen.

I'd recommend it to anyone :good::good::good:
[Nexus 9 Q&A, Help & Troubleshooting] Nasty64:
I like mine a lot - great tablet (and I've had a lot of them). Running the AICP ROM. My only complaint is that it only has 32GB of storage with no expansion. If it were 64GB it'd be perfect.
[Nexus 9 Q&A, Help & Troubleshooting] rmagruder:
I have to ask about custom ROMs at this point. I have a Nexus 6 running stock T-Mobile firmware and it runs amazing. Very responsive...I rarely if ever touch the screen and then feel like it locked up. The N9? Not so much. I've run stock 5.x.x and I'm running the 3rd M Preview right now, and I can't say I am seeing any improvement. M seems no better or worse, except with sleep battery drain on M, which is awesomely small.

I find that the WORST app on the device is Chrome, no matter what version (stable/beta/dev). It is just touch, then wait for SOMETHING to happen. Even the loading circles and often the bottom nav bar stuff goes unresponsive. Multitasking can take several seconds to switch or start an app. It's just a stuttery, freezing mess. I don't know at this point if it's that stock Android just sucks on the N9, or the nVidia 'denver' experiment is just a total fail. To answer a common rejoinder: I have wiped the device several times and see the same crappy stuttering/lagging/freezing on a newly reset tablet.

I'm wondering if people who were in my circumstances found salvation with a custom ROM and/or Kernel. If so, is there a 'favorite' out there for compatibliity, speed and stability? Do these ROMs for the N9 truly solve the atrocious unresponsiveness of the device? I honestly don't even give a crap about battery drain at this point. I'd rather have a tablet I have to recharge all the time than one I don't even want to pick up because I can tap the screen and then go do something on my Nexus 6 while waiting for the Nexus 9 to unfreeze itself and consider doing the thing I just asked.

Any advice would be useful. I'm okay with going back to a 5.x custom ROM at this point. I am looking forward to Marshmallow, but it hasn't really solved my complaints against this tablet.

Randy
[Nexus 9 Q&A, Help & Troubleshooting] USBhost:
Try AICP
[Nexus 9 Q&A, Help & Troubleshooting] rmagruder:
I actually saw someone reference Dirty Unicorn, so that will be my first go, and after that AICP. Anything to get this tablet to actually be usable...
[Nexus 9 Q&A, Help & Troubleshooting] USBhost:
i would really love to have a logcat and kernel log

of your unstable Nexus 9
[Nexus 9 Q&A, Help & Troubleshooting] rmagruder:
Well, it's a bit late for that, as I've already flashed Dirty Unicorn and it's now just getting apps downloaded. Honestly, I just don't know what it could be. It wasn't rooted and didn't have anything funky going on with it. If there was an ill-behaved app, I couldn't identify it. Besides, just wiping and retrying Android M (latest preview) then opening Chrome and browsing showed me janky scrolling and hesitations galore. So far, DU is running quicker and I'm not seeing the slowdowns, so I'm crossing my fingers that whatever is in the DU Kernel and ROM has mostly dealt with the issues. I honestly have worried that this tablet's "Denver" architecture is just dooming it. But I'm not giving up. I'm a nexus fan through and through. Nothing would suck more for me than to have to go to Samsung or some other tablet maker for my tablet. I don't remember being this unhappy with my Nexus 7 2013 model. Ever. I honestly thought about making a YouTube of me using it last night from my Nexus 6, just so people wouldn't think I was on some illegal substance. Just excruciatingly long waits while the tablet gave every sign of being completely locked up. No animations and no response to any touches. Then eventually, it would work out its 'issues' and resume working...at least for a few seconds until the next freeze.

---------- Post added at 03:52 PM ---------- Previous post was at 03:40 PM ----------

Follow-up. I just installed Dirty Unicorn. I see it has its own kernel. Is there any reason to flash Elemental X over it?
[Nexus 9 Q&A, Help & Troubleshooting] rmagruder:
Update: Dirty Unicorn is pretty darned smooth. I'll hold off on ElementalX until someone gives me a good reason to flash it, but this is much better. Why can't Google make a stock Android version on the N9 that isn't horrible performance-wise on a Nexus 9?
[Nexus 9 Q&A, Help & Troubleshooting] torax242:
"hack your device" is not the answer

It simply cannot be that "have you tried installing custom rom XYZ" is the only answer to "my N9 experience is terrible". If the device lags, spontaneously reboots, takes 10 seconds to switch back to the last used app, cannot be used while Play Store installs an update I call it defective. I know that Android tablets and phones are fully capable computers. But so are cars and LCD TVs and nobody expects me to install a custom ROM or reboot or reset them when something goes sideways.

My point is: if an expensive tablet like the Nexus 9 has a terrible user experience, it is broken. If it is broken it needs to be fixed.

Yes, that is true.

I only reboot my laptop when a system update requires it. I use embedded computers - such as tablets, phones, TVs and for a couple of years laptops running Windows, OSX and Linux - because they are "instant on". So a Tablet that requires daily reboots definitely doesn't meet my expectations.
[Nexus 9 Q&A, Help & Troubleshooting] creambyemute:
Honestly?

I've seen multiple Nexus 9 in the last weeks. We have one in the office, I have one at home, some friends got one and every Nexus 9 has the same Problem.

It's slow like the Nexus 7 2012 (not general performance) with huge lags and going unresponsive all the way (you can't do anything for 2-10 seconds). And this is not a behaviour that happens like 2-3 times a day, no 2-3 times an hour while using it.

It's definitely the worst ever tablet I've held in my hands in regards of Performance. Sure older tablet were slow as well, but this is a top notch specced tablet that can't stand up to the speed of the Nexus 7 2013 in any way.

It's a real pain to use this tablet :(

Only thing that gave me a slight relieve (and it's still utterly **** and lagging) is to completely disable any encryption. But the difference is really minimal.

Even my Galaxy Nexus did never suffer such unresponsiveness as the Nexus 9 does.

I'm happy when a nice custom rom with Android 6.0 arrives and I can try it that way. Anyway, my Nexus 9 is a dust keeper for now and is not used anymore as it just makes me aggressive every time it goes unresponsive for some seconds...
[Nexus 9 Q&A, Help & Troubleshooting] ewa12321:
Maybe some badly written apps are just freezing whole system? With mine tablet Fleksy was making whole problem. Enable "Show all ANRs" in Developer Settings, check system logs after freeze or crash that how you possibly find bad app that makes your experience on android terrible, I don't have so much big problems with this tablet and writing about this tablet is garbage because you have with it problems its not quite fair, not every nexus 9 is bad
[Nexus 9 Q&A, Help & Troubleshooting] ritchea:
Thanks for your update. My N9 experiences everything you've detailed. I have stock 5.1.1 with Elementalx -an improvement over stock. It may be an app or apps. Chrome beta seems to be a problem (frequent lock-ups, random reboots while using the browser) but still generally faster than others I've tried. At times, this tab is slower than either of my former N7's--more like my original Toshiba thrive. Keep us posted on your experience with other roms. I'm still hoping M will help but don't see any point in trying it yet. Tomorrow, Dirty Unicorn for a week or more.
[Nexus 9 Q&A, Help & Troubleshooting] rmagruder:
Here we are a few days later. Still very happy with Dirty Unicorn. I now actually reach for my tablet and anticipate enjoying using it. It's now very responsive. What the hell is wrong with Google?
[Nexus 9 Q&A, Help & Troubleshooting] ritchea:
I do see some improvement. Lag on home screen redraw only once. No lock-ups on Chrome beta-yet. Browsing seems to generate less heat. Battery life not good but could be Chrome. I installed Banks gapps. I get a few messages about certain google apps stopping. AOSP keyboard doesn't like TouchPal.

I'm definitely sticking with it for a while. Never been into nightlies (mostly stuck to stock, anyway) but may use them for this.
[Nexus 9 Q&A, Help & Troubleshooting] rolldroids:
I will try to explain what is going wrong with this device as far I have been able to discover:

My Nexus 9 often has low and critical memory after running a few days (watch at developer options -> process statistics -> tap on the bar) This should almost never happen because before Ram state changes from normal to moderate some unneeded background stuff should get freed. This has not been working correctly on the n9 and so the feature has been deactivated completely:

https://android.googlesource.com/kernel/tegra/+/android-tegra-flounder-3.10-lollipop-release

So the memory is filled with stuff just to have it in Ram (normal behaviour) but when Ram gets low, any process is killed without carefully selecting which one. So it is busy getting memory freed by killing (the wrong) processes, and restarting those all the time, resulting in much heat. The long lag times occur because the OS can't free up memory properly and runs out of memory.

Your can watch in process statistic and use an app like usemon to see the CPU usage. My nexus 9 has low and critical memory state and about 2 GHz CPU clock all the time (so CPU clock reducing hardly happens) but this occurs after some hours or days run time. So the performance is poor and the case hot. Now I rebooted and see that memory state is normal and CPU clock is 510 MHz most of the time. Till tomorrow...

Any thoughts?
[Nexus 9 Q&A, Help & Troubleshooting] wojwem19:
This!. This is EXACTLY what I am experiecing! most of time my N9 takes 2+ mins to normally boot up aswell. It just feels like this device chokes with simpliest commands.
[Nexus 9 Q&A, Help & Troubleshooting] metaphz:
Yes I have thoughts, thank you for asking. As I stated in another thread the concept behind the device is fantastic. The N9 with a 64bit CPU architecture and 64bit OS is a fantastic cutting edge move. However the decision to go with only 2GB of RAM cripples the device. Without at least 3GB of RAM by design it will slow to a crawl.
[Nexus 9 Q&A, Help & Troubleshooting] ritchea:
Not a programmer/developer here. What you say makes sense without having any technical background to know otherwise. Regarding the source you linked, isn't that info for developers? That info was posted in November. This " so turn off cgroups entirely until we come up with the proper solution" has been implemented while we wait for a proper solution? The Shield has the same processor but not the same issues? I do realize that hardware is more complicated than this. I'm just trying to understand, also, but not having the developer background, I'm not sure that I can.

While DU seems to have improved my tablet, it did another reboot this morning while on Chrome beta. I think I'm going to have to start making notes about what's going on. In the meantime, I'm going to remove Chrome and live with something else for a week or so.
[Nexus 9 Q&A, Help & Troubleshooting] rolldroids:
[MENTION=5658386]metaphz[/MENTION] I agree. The Nexus 10 (2012) has got 2 GB, I really don't understand the decision to not increase the Ram in a new device 2 years later. One could think that engineers at Google think Android's Ram management is so good that more Ram is not useful. But that is not true because the Nexus 6 has got 3 GB. Weird.

[MENTION=4248278]ritchea[/MENTION] the linked info is from an Android developer, and for all interested people. Yes, cgroups has been deactivated and as far as I know, not been reactivated yet. The shield tablet doesn't have the same processor. It's a bit confusing that to different SOC have the same name.
[Nexus 9 Q&A, Help & Troubleshooting] ritchea:
Thanks, rolldroids.
[Nexus 9 Q&A, Help & Troubleshooting] Baguett:
Do you guys have any hopes that Android M will fix this tablet? I am so close to flashing my first custom ROM on this device, as i am sick and tired of the lag and horrible memory handling on stock. However, knowing that all of the previously released updates did nothing to improve the performance, i cant say that i think M will do anything different. Thoughts?
[Nexus 9 Q&A, Help & Troubleshooting] rolldroids:
I think that are completely independent timelines. What you can do is search for your issue in the issues list and star it (here is my issue https://code.google.com/p/android/issues/detail?id=175232 ) or create a new entry if there is no matching issue.
[Nexus 9 Q&A, Help & Troubleshooting] wojwem19:
Got tired of awfull performance of my N9 as well. I must say that DU did some miracles overhere
[Nexus 9 Q&A, Help & Troubleshooting] ritchea:
After rebooting three times in one day (actually, within a few hours about 10 days ago), I totally wiped, put stock back on, and very slowly started adding apps, as well as root, ElementalX kernel, and TWRP. About 4 days ago, it did another reboot. This was soon after I'd re-installed Quick Boot Reboot. I took it off and no problems for days. Could it really have been that simple? Well, I think it could. I have the same capabilities with RomToolbox Pro, so I'm not missing much. I do miss a few things from DU--especially the expanded quick tiles. (I haven't gone back into Xposed--yet).

Currently, with about half my apps back on, the N9 is working very well: no reboots, no lags--even on Chrome beta.
[Nexus 9 Q&A, Help & Troubleshooting] jd1639:
Yeah, keeping this thing as stock as possible has worked well for me too. No custom Rom, no xposed. I'm rooted with twrp and that's all the customization I've done. I've never had any random reboots or problems with chrome. I do have to clear tabs and reboot every day or two to avoid lag, but that's it.
[Nexus 9 Q&A, Help & Troubleshooting] giancarlo_f:
I can confirm this !

Stock lmy48m / rooted / twrp

Verstuurd vanaf mijn Nexus 9 met Tapatalk
[Nexus 9 Q&A, Help & Troubleshooting] torax242:
So you are rebooting to avoid reboots and you use only the absolute minimum of Chrome's capabilities? I'm sorry for being sarcastic but of course your tablet should be fast when freshly wiped. Of course you don't experience any memory leak when you turn it off after using it.

But this is not the point: the Nexus 9 has a terrible experience when used like a tablet is supposed to be used: you never shut it off, you never wipe it, you don't have to administrate it once it is set up, you just have it around and use it whenever you like.
[Nexus 9 Q&A, Help & Troubleshooting] madbat99:
Never turn it off? You should reboot ANY broadband or wireless device at least once a week. Computer, tablet, phone, printer, whatever. You will avoid many problems.
[Nexus 9 Q&A, Help & Troubleshooting] torax242:
Who says that? Should I reboot my car, TV, fridge, washing-machine as well? Should your bank reboot it's systems? If you reboot your computer not the problem is avoided, you just don't experience the symptoms as frequently. Systems that need rebooting (or reboot themselves spontaneously) have severe errors. That is OK, if I have a cheap china phone. But if I pay almost 500€ I do not accept severe errors. My Android phone does not require reboots, my notebooks don't require reboots, so why should I accept weekly reboots as acceptable?
[Nexus 9 Q&A, Help & Troubleshooting] madbat99:
It's the nature of devices. Your phone and computer should also be rebooted, whether you think you have problems or not. You're not avoiding symptoms by rebooting, you're solving them. Very few devices are intended to run nonstop for their entire life. I'll never understand people who think rebooting a device is a huge chore. It's one button. But I'll continue my problem free way, and others will continue theirs. I'm not pushing my views, just sharing my experience.

That said, I'm starting to hate how glitchy and ram starved this tab is.
[Nexus 9 Q&A, Help & Troubleshooting] torax242:
I really hope you're not working in any profession that has anything to do with the creation of software or are not planning to do so. A "it's the nature of machines" attitude might be acceptable in a hobbyist environment, but it won't do in any serious business. We are in 2015 and developers should have enough experience to keep their devices in a well known state. If you have a device that requires a reboot it means that it's developers have no clue what really happens inside and it requires extreme measures to get back into a defined state.

I'm not telling you that you should be angry about the bad software quality of the Nexus 9. I am only telling you that you are wrong with your opinion everything is OK with the Nexus 9 because it works after a reset.
[Nexus 9 Q&A, Help & Troubleshooting] madbat99:
I would never say everything is OK with the n9. It most certainly is not. You misunderstand. I was saying a weekly reboot is good practice for most devices to keep them running optimally. But if you don't, it shouldn't crash or reboot itself. This thing is a huge disappointment to me.

It sounds like the only thing it does well is play games that are optimized for the tegra k1. Well I'm a grownup and don't play games. The N9 is pretty lacking when it comes to regular day to day tasks.

Incredibly disappointed.

HTC had a sale the other day, you could get one for like 240 to 280. I asked my wife has if she was ready to step up from her n7. Nope. She likes the size of mine, but that's it. She wants a tab s2. I think I should have went that route. Ya live and learn I suppose.
[Nexus 9 Q&A, Help & Troubleshooting] rolldroids:
Reboot is an annoying thing on the n9 because brightness control is broken and I have to switch on and off adaptive brightness until it decides to work. New Nexus smartphones will be released on 29th and they havent even finished the n9. ?
[Nexus 9 Q&A, Help & Troubleshooting] ewa12321:
Has anyone tried reducing resolution? I did it yesterday and wow its so fast now and cooler temperature cool thing that root isn't needed, only Death Raily doesn't want to work. I did it turned on USB Debug and trough cmd from Windows I reduced resolution little bit, my settings resolution

1830x1440 dpi 300

Translated with my own brain to English ;)
[Nexus 9 Q&A, Help & Troubleshooting] the.teejster:
Can you please post how you changed resolution w/o your tablet being rooted ?
[Nexus 9 Q&A, Help & Troubleshooting] dadymon53:
Has anyone been Sucessful in getting layers to stick? I read someone's solution, seems a bit of a hassle!
[Nexus 9 Q&A, Help & Troubleshooting] madbat99:
Just have to create the right folder and move the files there.

Actually I think the latest update to layers manager fixes the issues with the n9. It has to do with this tab having separate vendor image because its 64 bit.
[Nexus 9 Q&A, Help & Troubleshooting] ewa12321:
Death Railly works just reinstalled and it helped :)

Here are instructions how to reduce resolution without root

---------------------------------

Step-1: Download and install ADB and USB drivers to your PC

Step-2: Go to Settings then Developer options and enable USB debugging. If the Developer options do not appear in the Settings, go to About phone and tap on build number five to six times.

Step-3: Connect the tablet to the PC using USB cable

Step-4: On the computer, hit the Windows key and type in CMD and press Enter (run it with admin privileges)

Step-5: Paste the following commands, and press Enter after each command

adb shell wm size 1440x1830

adb shell wm density 300 && adb reboot

Your device will reboot and start with new settings. Adjust them to your preferences

---------------------------------

How to return to original screen resolution: Run the following commands after every one press Enter.

adb shell wm size 1536x2048

adb shell wm density 288 && adb reboot

Translated with my own brain to English ;)
[Nexus 9 Q&A, Help & Troubleshooting] johnbrighton:
I have to say that while I've had a few problems with my N9 (RMA'ed for bad screen), but the tablet is great - it does what I expect of it for the most part. I've had the odd reboot - but then I've had that on every digital device i've ever owned. Certainly every tablet, every phone, every pc and every console - they've all had their little problems, but some of us (me included sometimes) do allow these to get the better of us.

The N9 is a powerful and capable tablet. I'm not sorry I got it at all. I see the arm64 updates rolling in almost daily, so we've not been forgotten on our 64bit Denver 'experiments'. I've not experienced any of these problems at the level described.

For the record, I believe that banks do have some sort of computer shut-down every 24hrs, to ensure that data is transferred and backed up without error. Only really really expensive systems are designed to run 24/7. There is no tablet or consumer level device that does not benefit from rebooting regularly.

And don't forget beta software is pre-release, untested software that you shouild EXPECT to crash, stutter and cause reboots.