yashsingh1/xdaforums huggingface dataset:
[Acer Iconia A700 and A510] monacoo:
I know about unlocking bootloader, the problem is that update.zip does not work. I tried 3 different versions from acer website. When I try to update them over twrp, I got Failed (assert failed: getprop("ro.product.name") == "a510_ww_gen1" - depends on version)

---------- Post added at 15:36 ---------- Previous post was at 15:28 ----------

I also tried stock recovery_1_0_44_00 found on xda and when I rebooted and have put any of update.zip on sd, I got just android and 1/5 progress bar, ther lying android with red triangle :(
[Acer Iconia A700 and A510] meikelrix:
IIRC, rather than flashing an 'update.zip', I had to reflash the entire stock rom, in order to get the JB bootloader.

best regards

m
[Acer Iconia A700 and A510] monacoo:
SUCCESS:

1. flash stock recovery 1.044.00

2. flash update.zip from OS_Acer_RV28.RC02.WW.GEN1_A40I_A.zip (OTA did not work "low network coverage"

3. flash update.zip from OS_Acer_AV051.RV11RC01.WW.GEN1_A41J_A.zip

4. unlock bootloader fastboot oem unlock

5. flash twrp recovery

6. boot recovery

Boot with Vol- + PowerOn

First vibration => Release PowerOn

Second vibration => Release Vol- and press Vol+

7. flash CM12.1

wait wait

8. Boot A510 CM12.1 wait wait wait

:)
[Acer Iconia A700 and A510] kraoc:
no error :)

just stuck at "Loading" screen..; I select an episode and can stream to my chromecast but can't read it on the tablet...

there's no error anymore... I waited for many minutes (+20 !)
[Acer Iconia A700 and A510] kleSk_zer0:
About Netflix: With Flixster I had the same problem with endless loading.

I had to hide root via root cloak (xposed) then it worked.
[Acer Iconia A700 and A510] kraoc:
worked on kitkat rooted and no cloak...

i think this is an issue between netflix and android 5.1
[Acer Iconia A700 and A510] Shreps:
Any feedback regarding the brightness issue with the latest build ?
[Acer Iconia A700 and A510] meikelrix:
[MENTION=4493088]Shreps[/MENTION]: I didn't see any problem there. Only noticeable thing: the screen flickers, if pulling the notification drawer from the top, but I can easily live with that, since your ROM is so snappy :)

best regards

m
[Acer Iconia A700 and A510] flatratte82:
Working great on my A510. Thanks alot :)
[Acer Iconia A700 and A510] android_paul:
i managed to flash last build to an A700 at last. Now it reboots quite freqently and after that it rebuilds cache ("Optimizing...") everytime. Any suggestions?

[UPDATE]

I noticed the "Optimizing" only after random reboot. When reboot is released by user, there is no "Optimizing" during restart. It might have s.t. to do with broken dalvik-cache? Maybe s.t. is wrong with partitions?
[Acer Iconia A700 and A510] Shreps:
Thx for the feedback.

This is really weird because we don't have this issue on A510.

Do you think you can grab a full logcat before the reboot ? to try to figure out what's happening.

Also, What's your bootloader version + which Recovery are you using ? Thx
[Acer Iconia A700 and A510] wallacefung:
Actually, I have random reboot and rebuild cache problem too but not frequently happened.

I'll try to grab logcat if I still remember how to do it.

Coz it's been a long since I made it last time.
[Acer Iconia A700 and A510] kraoc:
I have some hard reboot when I launch an app.. .then reboot is pretty long... Maybe optimizing too.

I'm on a JB unlocked bootloader and TWRP recovery... If it may help...

by the way brightness seems to work well :)
[Acer Iconia A700 and A510] android_paul:
Logcat is in progress - tab just rebooted while attempting logcat... ;)

My bootloader is JB 653b3b3 (unlocked) and recovery is TWRP 2.7.1.0 - Tab is rooted (SuperSU).

You find my full SysLogs HERE:

"crash" means just before random reboot -> http://ovh.to/qKzDKai

"fresh" means just after reboot -> http://ovh.to/QstFbCq

Thank you for taking care... :good:
[Acer Iconia A700 and A510] Shreps:
Ok, so here is the bug :

04-21 11:40:54.314 D/GraphicBufferAllocator( 4501): Total allocated (estimate): 57075.00 KB
04-21 11:40:54.314 D/GraphicBufferAllocator( 4501): Nvidia Gralloc
04-21 11:40:54.314 E/ ( 4501): GraphicBufferAlloc::createGraphicBuffer(w=1344, h=270) failed (Out of memory), handle=0x0
04-21 11:40:54.314 E/BufferQueueProducer( 4501): [com.tortel.syslog/com.tortel.syslog.MainActivity] dequeueBuffer: createGraphicBuffer failed
04-21 11:40:54.314 W/nvwsi ( 9126): dequeueBuffer failed, error -12
04-21 11:40:54.314 E/libEGL ( 9126): eglMakeCurrent:792 error 3003 (EGL_BAD_ALLOC)
04-21 11:40:54.314 F/OpenGLRenderer( 9126): Failed to make current on surface 0x5eeae260, error=EGL_BAD_ALLOC
04-21 11:40:54.314 F/libc ( 9126): Fatal signal 6 (SIGABRT), code -6 in tid 9169 (RenderThread)
04-21 11:40:54.374 I/DEBUG ( 4510): *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** ***
04-21 11:40:54.374 I/DEBUG ( 4510): Build fingerprint: 'acer/a700_emea_cus1/picasso_mf:4.0.4/IMM76D/1337332281:user/release-keys'
04-21 11:40:54.374 I/DEBUG ( 4510): Revision: '0'
04-21 11:40:54.374 I/DEBUG ( 4510): ABI: 'arm'
04-21 11:40:54.374 I/DEBUG ( 4510): pid: 9126, tid: 9169, name: RenderThread >>> com.tortel.syslog <<<
04-21 11:40:54.374 I/DEBUG ( 4510): signal 6 (SIGABRT), code -6 (SI_TKILL), fault addr --------
04-21 11:40:54.464 I/DEBUG ( 4510): Abort message: 'Failed to make current on surface 0x5eeae260, error=EGL_BAD_ALLOC'

which means there is no enough memory sometimes for the graphical rendering.

And because the A700 is 1920x1200, it happens more often than the A510 (1280x800)

It will hard to fix :(, this will need Kernel tweak :(

EDIT : [MENTION=5455811]android_paul[/MENTION] maybe you can try to play with Developer options and try with/without GPU rendering, with/without overlay, etc.
[Acer Iconia A700 and A510] android_paul:
Thank you for analysing. I'll try to tune the dev.settings.

[EDIT]

After testing dev.options related to graphics without noteable effects, I' m back on pacman 4.4.4 rc.3 again... ;-(
[Acer Iconia A700 and A510] cyberdroidXDA:
Flashed CM12.1 on my tab and I love to see how fast and smooth it's running in this old hardware. Really great job, nicely done [MENTION=4493088]Shreps[/MENTION].
[Acer Iconia A700 and A510] Jeka_ekb:
Good afternoon, in cm-12.1-20150409-UNOFFICIAL-a510, cm12-20150409-UNOFFICIAL-a510 not working GPS. Tell a cm-12.1-20150417-UNOFFICIAL-a510 eliminated this bug?
[Acer Iconia A700 and A510] kraoc:
Maybe there is a way to use Ziyan work ?

He were developping Z Kernel but there is no more activity for some weeks...

This may be a good starting point ?
[Acer Iconia A700 and A510] sbaloo:
problem with play store

Hi

After following the tuto on my A510 witch was previouly in Cyanogen mod 11. I just clear the cache and the davik cache. I install the 12.1 and also 5.1 gapp. After the tablet start i can launch the play store but i can't download an update . And when i start it says that i have to update service google play. But I have erreur 925. So :(. What I can do to be able to download from play store?
[Acer Iconia A700 and A510] Shreps:
Did you try with a factory reset ?
[Acer Iconia A700 and A510] jacek90210:
Hi

Is there any chance for port CM 12.1 for A511 ?
[Acer Iconia A700 and A510] coolhot_fdb:
Today i tried CM12.1 on my A510. Coming from CM11 i installed the ROM from 150417 and PA GApps Nano (150315) after deleting /system /cache /dalvik.

Most time it run very smooth. But there are heavy problems with connecting WLAN. The connection isn´t reestablished after brake through reboot or flight mode. It hangs without getting a IP. If i delete the connection at the tablet and access point and make a complete new connect it will work again until next disconnect.

I use a AVM FritzBox 7390 with newest firmware as WLAN access point with WPA2-PSK (CCMP) as encryption. There isn´t any trouble with WLAN under CM11.

[MENTION=4493088]Shreps[/MENTION]: Thank you very much for your continued work on the A510. I like your CM12.1. But i´m afraid i can´t use it without proper working WLAN. So i flashed back to CM11.
[Acer Iconia A700 and A510] sbaloo:
Yes i tried and it works. Thanks
[Acer Iconia A700 and A510] Shreps:
CM 12.1 for A510 is compatible with A511, but the Modem/RIL part doesn't work (so, no Data/3G)
[Acer Iconia A700 and A510] Shreps:
I will check other device with same chipset, maybe there is some driver update. Plus, it could be better with the general CM repo upgrade
[Acer Iconia A700 and A510] android_paul:
The wifi problem is related to cm 12 and also cm 12.1 using a Fritz!Box. Google for this, it's explaint somewhere in the www. Workaround: set the IP static in your acer and everything works just fine.
[Acer Iconia A700 and A510] coolhot_fdb:
Thanks, i tried again but it really doesn´t work. No matter which wifi options i choose the reconnect doesn´t work. It connects with static IP but get no internet conncetion. Do i use DHCP without fixing the IP in Fritzbox every connection get a higher IP (.20, .21, .22 and so on). It seems CM12 is really not compatible to FritzBox at the moment. I will send a bug report to the FritzBox manufacturer AVM.
[Acer Iconia A700 and A510] memyselfandiagain:
I have the same set-up (Fritz 7390). Works fine for me, used WPS. I did a clean install.

Gesendet von meinem A510 mit Tapatalk
[Acer Iconia A700 and A510] coolhot_fdb:
Do you use DHCP on your Acer Tab? And what about the child safety filter and the access profiles? Do you use it?

Maybe i try a clean install after factory reset if this works.
[Acer Iconia A700 and A510] memyselfandiagain:
Yes, I do use dhcp. But no access profiles.

Gesendet von meinem A510 mit Tapatalk
[Acer Iconia A700 and A510] jacek90210:
So the last version for 511 is CM 11?
[Acer Iconia A700 and A510] Shreps:
Yes, for the latest stable ☺

Envoyé de mon A1-840FHD en utilisant Tapatalk
[Acer Iconia A700 and A510] kraoc:
May we upgrade directrly from CM12 to CM12.1 just doing erase cache ?

I installed CM12 with gapps-lp-20141109-signed.zip and plan to install CM12.1 with nano gapps... Should I do something before going to flasgh ?

Thanks!
[Acer Iconia A700 and A510] Shreps:
Backup in case of :p

But yes, Upgrading should work by flashing cm12.1 + proper gapps
[Acer Iconia A700 and A510] kraoc:
nandroid backup or just titanium ?

is the 12.1 more stable and more responsive than 12 ?
[Acer Iconia A700 and A510] coolhot_fdb:
Yes it is more responsive than CM12 and i suggest to do a backup via recovery (CWM or TWRP) before flashing a new ROM.
[Acer Iconia A700 and A510] nicoaq:
a500

will it work for a a500 tab?
[Acer Iconia A700 and A510] coolhot_fdb:
I tried again. This time with a clean install after complete factory reset/wipe. WiFi worked now with my FritzBox, but only with a static IP. DHCP didn´t work.

After a few days i flashed back to CM11. CM12.1 was to laggy. Turning on the screen from standby often needed 5 - 10 seconds and some apps often hang up.
[Acer Iconia A700 and A510] Shreps:
cm-12.1-20150514-UNOFFICIAL-a510 (2309701493fed98a40ce431252dc81cc)

cm-12.1-20150515-UNOFFICIAL-a700 (	0762a9b1c41f33209163efc2607a2c2c)
[Acer Iconia A700 and A510] coolhot_fdb:
Oh a new version. Is there a change log?
[Acer Iconia A700 and A510] Shreps:
Nothing changed on the device specific code. Only CM sync (upgraded to Android 5.1.1 and all commit from CM team) -> you can check this : http://www.cmxlog.com/12.1/grouper/
[Acer Iconia A700 and A510] memyselfandiagain:
Working fine so far.... More responsive....

Gesendet von meinem A510 mit Tapatalk
[Acer Iconia A700 and A510] coolhot_fdb:
Did you test the version earlier, too? Did you have lagging on power-on and app-starting via link from message center? And how about now?
[Acer Iconia A700 and A510] memyselfandiagain:
I had the earlier version running as well and tablet was sometimes very unresponsive. Had to clean running apps on a regular basis and had system ui force closures.

With new version still no such issue. Waking up fine. Apps are responding...looks good from here :)

Gesendet von meinem A510 mit Tapatalk
[Acer Iconia A700 and A510] coolhot_fdb:
First Feedback to new version: It´s running much better. More responsive, but not as fluid as CM11. Sometimes apps hang up and must be forced to close. Some Apps, like Facebook need very much flash and RAM space. I guess the new runtime (ART) is the reason for this. You also can see longer installation times when updating apps. I will continue test next week and report next weekend.

WiFi still doesn´t work with DHCP with my AVM FritzBox 7390. But it´s fine with static IP.
[Acer Iconia A700 and A510] cyberdroidXDA:
For me the new version is much better than the previous one. You should release new builds more frequently, I guess ;) [MENTION=4493088]Shreps[/MENTION]
[Acer Iconia A700 and A510] Shreps:
I will :p

But there are less and less A510 users, so those build are only for you guys.

Even I no longer use the tablet, only to flash builds and make some testing, that's all.
[Acer Iconia A700 and A510] kraoc:
Keep on it :)

Childs & Wife still use this tab... until we get a new one but not enought money for it now... ^_^
[Acer Iconia A700 and A510] memyselfandiagain:
Oh, please keep updating the ROM. The tablet is still performing great for me - too good to think about a new one :)

Gesendet von meinem A510 mit Tapatalk
[Acer Iconia A700 and A510] coolhot_fdb:
There are many users (me included) in the german android community. We have a own thread: http://www.android-hilfe.de/custom-...-1-cyanogenmod-12-1-acer-a510-unofficial.html

I use it daily and there is no reason to buy a new one.
[Acer Iconia A700 and A510] samous:
Just Thank You!

We are so many, and we love you [MENTION=4493088]Shreps[/MENTION] (merci mec!)
[Acer Iconia A700 and A510] HornetRider:
Hi, I don't have been here for a longer time, because I have a Samsung Galaxy Tab S 10.5 LTE now.

But my Acer Iconia A510 is still running great in my family with your builds.

With your latest update it's now really good responsive, no bad lags anymore.

So please keep updating this your great work
[Acer Iconia A700 and A510] Shreps:
Yeah

Glad to read all your reply guys ;)
[Acer Iconia A700 and A510] oberworld:
Thank you very much for your work. Keep on it.

I have a question, ¿there is any way to move the navigation bar buttons to the left of the screen?

Rom is working great here (A510), some flickering screen issues.

Regards.
[Acer Iconia A700 and A510] monacoo:
Thanks to you we are still using A510 and for now I do not see any need for replacing it (in my office I have iPad Air and I really hate it)

Idea of changing position for navbar interests me too since by mistake I select "home" instead press space many times..
[Acer Iconia A700 and A510] meikelrix:
[MENTION=4493088]Shreps[/MENTION]: many thanks for the 'fountain of youth' to our tablet. Is there anything we can help you with?

merci beaucoup pour ton travail :)

m
[Acer Iconia A700 and A510] cyberdroidXDA:
[MENTION=4493088]Shreps[/MENTION]

Don't give up...my A510 is still in use day by day and it's happy to be feeded with new updates. Keep on developing. Don't let this beautiful device die! ?
[Acer Iconia A700 and A510] Shreps:
Nice photos [emoji14]
[Acer Iconia A700 and A510] Fahmul:
Pliz help.. A700 still keep blank screen after use 4-6 minutes, and we have to push power to start again and like back to new installation, "Android is Starting" with calculate "Optimizing app."
[Acer Iconia A700 and A510] tasujad:
Just a little bit more :)

I use the tablet daily and it has been serving our family faithfully for last couple of years :good: . I still can't find suitable replacement and so i hope it can be kept alive just a little bit more :D

Thank you shreps
[Acer Iconia A700 and A510] cyberdroidXDA:
Thanks, I prefer the last one: Tablet screen off, external HDMI on, IR keyboard plugged in and running. I like Android's flexibility ?

I really miss a custom kernel like the Z-Kernel. Some fine optimisations and little OC would make this tab immortal. ?
[Acer Iconia A700 and A510] Shreps:
cm-12.1-20150523-UNOFFICIAL-a510 (d617cc135438846c061225865c0c87d6) [android-5.1.1_r3]
[Acer Iconia A700 and A510] monacoo:
Unfortunatelly wi-fi can not be turned one...
[Acer Iconia A700 and A510] Shreps:
You're right, will have to look at it. CM changed something in hardware libs... :(

Edit: bug found, will build a new one tomorrow ;)
[Acer Iconia A700 and A510] monacoo:
Great. It seems it also corrupted something in data. After flashing back any previous, i got only optimizing app, then finishing boot an then it reboots and all over again. I did not have nandrord backup of latest version so i am installing everything again on clean rom...
[Acer Iconia A700 and A510] Shreps:
Please test the latest build (same link, different hash, available on FP)
[Acer Iconia A700 and A510] oberworld:
Wifi is working in cm-12.1-20150523-UNOFFICIAL-a510 (Clean install).

The first time the tablet goes to desktop (after config language, etc) i have a "settings stopped working" .

Till the moment doesn't happen again.

Have to test it a little more.

There's any way to remove screen flickering? and any posibilitties to move navbar buttons to the left?

Thanks and keep the good work.

Edit: UC Browser HD for tablets isn't working in any version of CM12.1, when load pages only get white screen, but I can confirm that it's a UC browser itself problem.

Edit 2: video isn't smooth no matter what player i use, even with native player ihave little interruptions, I don't remember if this happened in previous version.

Edit 3: Video problem seems fixed using bsplayer and switching decoding to software instead of hardware.
[Acer Iconia A700 and A510] Shreps:
- Yes Wifi is ok, it was only a Kernel issue on the previous build, this new build can be flashed over previous one without wiping data

- Screen flickering is due GPU drivers, as previous version of CM, you can only playing with overlays and GPU options in dev options

- The Navbar had been centered a long time ago by Google (in KK), and cannot really be changed without deep modifications in AOSP

- Never used UC Browser HD, can't tell, AOSP Browser or Chrome is fine for me :)

- Video decoding is ok on my tab, played a 720p and 1080p MP4 without problem using the stock Gallery
[Acer Iconia A700 and A510] meikelrix:
In regards to Video: I'm using "mx player" and have no problems at all (Network or local movies)

best regards

m
[Acer Iconia A700 and A510] kraoc:
Going to test it :)
[Acer Iconia A700 and A510] oberworld:
Ok, I can confirm that there isn't any problem with video.

After some reboots and unnistall some apps all it's ok. Maybe an app that make conflict?. I don't know.

The rom is very smooth and stable.

It's a great rom. I want to thanks to Shreps his great work with this rom.

About navbar buttons I will try Exalm's new tabletkat lollipop compatible when it's done. More info: http://xdaforums.com/showpost.php?p=59053610&postcount=496

About flickering I will try playing with settings, but not too much problem with it.

Best regards.
[Acer Iconia A700 and A510] cyberdroidXDA:
New build flashed and its running well. Thanks [MENTION=4493088]Shreps[/MENTION]
[Acer Iconia A700 and A510] coolhot_fdb:
Did anyone try Smart Lock? I tested trusted locations home in the previous version. It worked home but doesn´t detect other locations although another Wifi is connected and GPS is on. I can´t reactivate the lock screen with PIN, password or pattern. I found this article. There seems to be a bug in 5.1.
[Acer Iconia A700 and A510] NoBull73:
at first, many thx for the great Work for cm12 for the acer a700. at first i have some Problems to installiert the lateSt unoffiziell cm 12 mod. After installing IT stops booting at the Acer Logo. So I did the following... Full wipe, Flash the boot.im via fastboot, installieren the zip. Via recovery... After restart no Problems to boot. The First impression, cm12 run fine for acer a700. Unfortunatly it Reboot sometimes for itselve so may we habe to wait for a stabile Version.. greets!
[Acer Iconia A700 and A510] DJTaucher:
Tested CM 12.1 on A700

I've tested out the actual version from CM 12.1 on my A700 (cm-12.1-20150515-UNOFFICIAL-a700 from acer.shreps.fr). Installation with ClockworkMod works fine :svetius:

But i have very strange temperature problems on my device, that means the device becomes very hot (on the right side of the display and back, where the CPU is) and it chrashes very often and needs to restart with hard reset (10 Sek. on Power button). :( :( :(

As well the performance on the device is similar bad like with CM 11. :rolleyes:

Hopeful future versions will work much better.
[Acer Iconia A700 and A510] Shreps:
cm-12.1-20150605-UNOFFICIAL-a510a (161b2a5cceb8619bb8943bb4c7c23368)

online

On this build I upgraded hwcomposer vendor blob using the grouper one (Android 5.1)

It might improve graphics rendering.

I will now also try to play with z-kernel and try to bring up it to lollipop in a clean way.
[Acer Iconia A700 and A510] coolhot_fdb:
That are great news. Thank you very much! Best of luck with the Z-Kernel.
[Acer Iconia A700 and A510] cyberdroidXDA:
Yes! Keeping Finger crossed this will work. :thumbup:
[Acer Iconia A700 and A510] Shreps:
cm-12.1-20150606-UNOFFICIAL-a510 (ab5b04a18af6923dc8d388bdfd837702) [Using Z-Kernel]

Please try and feedback how is it running on your device :)

EDIT : +A700 version, maybe it will be a little more smooth

cm-12.1-20150606-UNOFFICIAL-a700
[Acer Iconia A700 and A510] coolhot_fdb:
Wow, that was fast. Do you want feedback how the version with Z-Kernel is running compared to the one without (cm-12.1-20150605-UNOFFICIAL-a510a) or to the older versions? Is it safe to try the version with modified kernel? What did you do on the kernel?
[Acer Iconia A700 and A510] memyselfandiagain:
I have installed it. What should I be looking for with Z-kernel?

Gesendet von meinem A510 mit Tapatalk
[Acer Iconia A700 and A510] cyberdroidXDA:
Thank you very much [MENTION=4493088]Shreps[/MENTION].

I need to charge the battery overnight before I can flash it. Will give feedback tomorrow.
[Acer Iconia A700 and A510] davlap:
Bingo ! A700 no longer constant reboots

Really pleased with the 12.1 upgrade

Nice one Shreps (sorry, had to remove links to post)
[Acer Iconia A700 and A510] cyberdroidXDA:
New version with Z-Kernel optimisation is up and running. [MENTION=4493088]Shreps[/MENTION]: You did a very good job. Respect.

My first impression is, that the ROM is much faster than the previous version. The positive effect is the same as already known from CM11 or Omni ROM.

But keep in mind that you have to set the max. cpu frequency to 1,5 GHz manually. Otherwise it will resist on 1,4 GHz per default.
[Acer Iconia A700 and A510] sstanescu:
Many thanks [MENTION=4493088]Shreps[/MENTION] for your efforts. On previous cm-12.1-20150605-UNOFFICIAL-a510a I ended up in a bootloop after flashing. Same issue downgrading, so flashed latest with a factory reset. Now is fine. I will check the z-kernel next.
[Acer Iconia A700 and A510] Shreps:
Nice !

Is-it usable as CM11 on the A700 ?

cc [MENTION=3117667]pawitp[/MENTION]
[Acer Iconia A700 and A510] davze:
It's usable. But concerning performance it's much slower and less responsive than CM11. As far as I can tell there are less graphical glitches. However I have problems watching web streams. They simply won't play.

Thank you for keeping the A510 alive!
[Acer Iconia A700 and A510] wallacefung:
When I boot into cwm recovery, I found all my old files and folders before LVM still kept in Sdcard folder. New internal storage is being kept in Sdcard/0/.

I am afraid even I restore my new system to default, all old sensitive files can be retrieved my someone.

How do I delete old files and folders in old system?
[Acer Iconia A700 and A510] Shreps:
Wrong thread.

Just format /data/media .

Envoyé de mon A1-840FHD en utilisant Tapatalk
[Acer Iconia A700 and A510] cyberdroidXDA:
Short update: The Z-Kernel has a small CPU frequency bug which reduced the max. CPU frequency to 1450 MHz if the tab resist in deep sleep for a few hours (running on CM11 or Omni ROM).

With CM12.1 it seems this has been fixed now. My tab was for 8 hours in deep sleep and still running on 1500 MHz.