yashsingh1/xdaforums huggingface dataset:
[Galaxy Note GT-N7000 Q&A, Help & Troubleshooting] diamondpillow:
Guys, go down to Samsung, their technicians should be able to help you.

This is what happened last friday.

I went down to the service center, told them that after updating to ICS, I face battery draining issue, and told them my phone cant go into deep sleep due to a wakelock - l2_hsic

They then told me to wait one hour, as they will reinstall the firmware for me, because I did not update through them. (OTA update isnt stable. lol)

Finally, after one hour, I went down, and they told me they cant fixed it yet, and will need additional 2 working days.

So after that they delivered the phone to my place this tuesday.

It's great, I think issue solved, now my phone deep sleep most of the time, and do not have that wakelock hogging my phone at 200mhz. The l2_hsic is part of the phone, but now its only at minimum.

After 3 days of usage, I can then be sure that the issue is gone. I hope it helps.

Issue solved. Go down to Samsung. (Btw, I live in Singapore)
[Galaxy Note GT-N7000 Q&A, Help & Troubleshooting] Andrew0811:
can you give us more specific location? like vivocity's samsung or elsewhere.

Edit:

If I am not wrong singapore is also using DXLP9, can you compare the firmware between the original DXLP9 and your current one?
[Galaxy Note GT-N7000 Q&A, Help & Troubleshooting] palmy999:
Give it couple more days. Someone in HWZ had L2_HSIC away for 7 days and returned on 8th, though on cutom ROM.

Someone in this thread also posted about 177 hours (7.x days) before L2_HSIC rise continuously again.
[Galaxy Note GT-N7000 Q&A, Help & Troubleshooting] shaftenberg:
So, after 14 days of being l2_hsic free with "Location over Wifi/GSM" set to off, I will turn it on again and check against.

Really weird...
[Galaxy Note GT-N7000 Q&A, Help & Troubleshooting] ephestione:
Well I contacted Samsung.

First time they told me to keep wifi/data/bt/gps off as they may drain battery.

D'oh!

I re-replaied telling them I didn't need condescending replies, since I knew battery was drained by keeping background services active and I'm fine with that, it's just not normal to have a phone last 10hrs while keeping it in standby.

"I do not expect a solution from your reply, I just want you to report this problem to the technical department so they can get it fixed sooner or later"

What do they tell me?

"You need to go to a samsung support center."

Yeah right, I would love to stay away from my phone for a week, to have a not-fixed factory status device :p

@diamondpillow

I have 3g data, wifi, bt and gps on during the whole day except sleeping hours, I have been l2_hsic free without doing anything special for several days, came back here to report the problem first time after a while.

3 days is not enough IMO, as others are stating.

I have just now disabled wifi/gsm location service not because of this, but because mytracks messes up the track by considering valid the rough position given by that service.

Should notice if the problem disappears or not, what's certain is that, even if it doesn't go wild and crazy, the multipdp and l2_hsic are always there with decent times, 1hr-ish each after a day.
[Galaxy Note GT-N7000 Q&A, Help & Troubleshooting] yanuk:
I contacted Samsung to fix this bug and their reply to me was "Do back up your data and do a factory reset. That is the general recommendation after a major software update"

I'm from sg too..
[Galaxy Note GT-N7000 Q&A, Help & Troubleshooting] palmy999:
That's why we have user forums like XDA to help. :D
[Galaxy Note GT-N7000 Q&A, Help & Troubleshooting] poopiest:
Facebook messenger is not the bad guy

After try uninstall FB messenger for 5 days, now this bad L2_hsic comes back.

And I have to reboot my phone to kill it again.

I don't like way to use phone like this. have to keep watching and looking in CPUspy app every 1-2 hours.

I'm tired now.
[Galaxy Note GT-N7000 Q&A, Help & Troubleshooting] poopiest:
4.0.4

Has anyone test the 4.0.4?
[Galaxy Note GT-N7000 Q&A, Help & Troubleshooting] Doodle:
I am on German 4.04. No L2_hsic sofar. Deep sleep no issue, even if I jank it from the USB plu without turning it on first.
[Galaxy Note GT-N7000 Q&A, Help & Troubleshooting] sp33d86:
I'm on 4.0.4 for about half a day now.

So far no issue with l2_hsic.
[Galaxy Note GT-N7000 Q&A, Help & Troubleshooting] poopiest:
That's a good news. So please keep updating. I will follow you soon. Many thanks.
[Galaxy Note GT-N7000 Q&A, Help & Troubleshooting] Metallan:
That kind of gives us hope. I'll backup preparing to install German FW XD
[Galaxy Note GT-N7000 Q&A, Help & Troubleshooting] sp33d86:
This morning i unplugged my note (4.0.4 GER) without unlocking it.

It's now unplugged for about 4,5 h.

L2_hsic kenel wakelock: 5 m.

Before the update i was able to watch the battery drain when i unplugged it locked.

Seems okay until now...
[Galaxy Note GT-N7000 Q&A, Help & Troubleshooting] Andrew0811:
I am usinh 4.0.4 no l2_hsic. Battery seems to be better, so far no issue.
[Galaxy Note GT-N7000 Q&A, Help & Troubleshooting] hyperken:
I believed they fixed this wake lock issue with 4.0.4. No issues since yesterday.:D
[Galaxy Note GT-N7000 Q&A, Help & Troubleshooting] sp33d86:
amazing... just amazing. :-)
[Galaxy Note GT-N7000 Q&A, Help & Troubleshooting] poopiest:
4.0.4

I'm now on 4.0.4 custom rom. will report this soon.
[Galaxy Note GT-N7000 Q&A, Help & Troubleshooting] shaftenberg:
For those who are testing l2_hsic on 4.0.4: Please turn on the Location Service over WLAN/GSM.

After 3 weeks without l2_hsic and having Location off, I turned it on again and hell, the wakelocks are back after 2 days. So I'll check again with Location off.

To be located, I had GPS turned on all the time the last weeks and I hadn't any impact on battery life, so this is safe.
[Galaxy Note GT-N7000 Q&A, Help & Troubleshooting] Andrew0811:
Always on for me but no l2_hsic.
[Galaxy Note GT-N7000 Q&A, Help & Troubleshooting] sp33d86:
Same here.
[Galaxy Note GT-N7000 Q&A, Help & Troubleshooting] poopiest:
For those 3 weeks, Did you test on 4.0.3 or 4.0.4?

Thanks
[Galaxy Note GT-N7000 Q&A, Help & Troubleshooting] sp33d86:
must have been 4.0.3, since 4.0.4 wasnt released yet. ;-)
[Galaxy Note GT-N7000 Q&A, Help & Troubleshooting] shaftenberg:
4.0.3 for sure :)
[Galaxy Note GT-N7000 Q&A, Help & Troubleshooting] Braxos:
Hope 4.0.4 will solve this issue. I updated the phone yesterday to this.

My phone was is and will be on stock roms no root not flashed anything, till stock roms can't provide me with what I need.

I will post screen shots of kernel wakelocks in a day or two, so I can have a better understanding of the results.
[Galaxy Note GT-N7000 Q&A, Help & Troubleshooting] miniharo:
I'm on 4.0.4 for a week now. L2_hsic isn't causing any issues for me c:
[Galaxy Note GT-N7000 Q&A, Help & Troubleshooting] poopiest:
Now end of day3 of 4.0.4, total usage 15hr/day, L2_hsic came around 1hr - 1.30hr/day. So far, nice deep sleep
[Galaxy Note GT-N7000 Q&A, Help & Troubleshooting] Braxos:
So 72 hours on a single charge with 1-1:30 l2_hsic? Or 3 days with each day 15 hours lasting charge and every charge cycle had 1-1:30 hours of l2_hsic?

Because on my phone 13hours with 11 hours sleep had 30 minutes of l2_hsic and 45 minutes wlan_rx_wake wakelocks with a sume of 1:45 hours a bit to much for my taste.
[Galaxy Note GT-N7000 Q&A, Help & Troubleshooting] qazokm123:
Same here. Still monitoring thou.
[Galaxy Note GT-N7000 Q&A, Help & Troubleshooting] poopiest:
It was charged everyday with 15 hr use each day. Moderately use. deep sleep 70-80% :victory:
[Galaxy Note GT-N7000 Q&A, Help & Troubleshooting] sp33d86:
still looking very good.

battery lasts much longer now with 4.0.4.

feels like double the battery life compared to 4.0.3.

and always with auto brightness.

hell yeah! :)
[Galaxy Note GT-N7000 Q&A, Help & Troubleshooting] skivnit:
are you even using your phone?:)
[Galaxy Note GT-N7000 Q&A, Help & Troubleshooting] Mattyas:
For me, charging seems to trigger the l2_hsic bug in stock 4.0.3.

A simple reboot fixes it until the next charge, does this help with your devices?
[Galaxy Note GT-N7000 Q&A, Help & Troubleshooting] palmy999:
Some of us have gone on days of plugging in/out without a single L2_HSIC. Then it just appears, somehow.:fingers-crossed:
[Galaxy Note GT-N7000 Q&A, Help & Troubleshooting] drbuck:
This is getting ridiculous. Nobody knows what triggers l2_hsic, nobody knows how to kill it without rebooting. C'mon man... Somebody do something already! This is so frustrating! Please please please!!! Samsung, Android, xda-developers... Anyone! For the love of everything sacred! *end of rant*
[Galaxy Note GT-N7000 Q&A, Help & Troubleshooting] oohyeah:
Yesterday I installed the GL_Notecore v4 kernel and now my phone has been lasting as long as it used to on GB! Very very happy!!!

Over the past 4 hours, l2_hsic only came in for 11m 54s, 4.3%.

Highest is now multipdp at 33m 58s, 12.2 %.

I've had 44% of deep sleep according to CPU Spy.

I'm a happy camper again!
[Galaxy Note GT-N7000 Q&A, Help & Troubleshooting] Ast2001:
I've upgraded to the official 4.0.4 more than one week ago and i have'nt seen any new problem with the l2_hsic wakelock. I've all geolocalisations activated.

I think that the problem has been solved by Samsung :)
[Galaxy Note GT-N7000 Q&A, Help & Troubleshooting] dhruvmalik:
FusionROM - 4.0.4...

Been on 9% for the past 1 hour.

No Drains at all. Will do a full cycle to confirm but seems to be good.

EDIT - Man Ohh Man...

Only a 4% Battery Drop with 3G On, 1 Exchange Account Sync, Background Sync On. FB Sync On 4 Hours, Whats App. All within 7 Hours last night. Mostly nothing was touched, but that goes to show stand by is back to what I was used to.

No more fiddling with the ROM....
[Galaxy Note GT-N7000 Q&A, Help & Troubleshooting] miniharo:
Hmm..my phone doesn't have the wakelock anymore, as I've previously stated. However it still drains quite fast esp heavy use
[Galaxy Note GT-N7000 Q&A, Help & Troubleshooting] Braxos:
That should be normal, at least for me. Better use of dual cores and hardware acceleration of gpu on ics, that gb didnt have so i dont expect the same times for screen on. Had 4.5-5 hours screen on plus 2-3 hours awake(music) and few % of battery left on GB. The sleep aka no use drain is the problem for me as on GB i had 2:45 for 1% drain now it is on 2:15. Same conditions only fw is different.
[Galaxy Note GT-N7000 Q&A, Help & Troubleshooting] dhar8062:
Running 4.0.3 Stock ROM rooted.

Please see the attached screenshots.

Reset the timers before going to sleep. Unlike me, my phone did not sleep at all!

Only started a few days ago. Never had a problem before. Might be associated with an update to Samsung Apps, Push Service and maybe Voice Talk.

Going to try uninstalling the updates and see if that is the cause.

Waiting for 4.0.4 update in the UK!
[Galaxy Note GT-N7000 Q&A, Help & Troubleshooting] Braxos:
It kicks on random times l2_hsic as we think, check plz if you where on a bad reception area when it started. Because now they added a antenna and getting H at home now I moved to 4.0.4 that hasn't the problem.

Thanks
[Galaxy Note GT-N7000 Q&A, Help & Troubleshooting] dhar8062:
Thanks for your reply!

4.0.4 has been released and I've updated so hopefully that will be the end of this problem.

Thanks for your help!
[Galaxy Note GT-N7000 Q&A, Help & Troubleshooting] iconer:
In my case, L2_hsic seems to kick in if I turn my Wifi on. When I'm not using wifi a whole day battery seems to be fine. I hope the problem will be gone if 4.0.4 arrived in my country.
[Galaxy Note GT-N7000 Q&A, Help & Troubleshooting] Braxos:
Till now there isn't a wakelock with 4.0.4 , using it 2 weeks now not a single one wakelock. Charging every day once or twice depending removing charger with locked screen, no issue at all.

Only weird thing is when removing charger the screen lock that pops up stays up as long as your timer to screen off and not few seconds as it would when you would press home button.
[Galaxy Note GT-N7000 Q&A, Help & Troubleshooting] iconer:
Good to hear that. I can still accept the screen timeout issue. Can't wait to try.
[Galaxy Note GT-N7000 Q&A, Help & Troubleshooting] ephestione:
From lack of new feedbacks in here, I understand 4.0.4 is the confirmed solution.

Right now tho, I realized I had fast dormancy enabled, while my mobile network doesn't support it, and have the drilling suspicion that might be one of the causes.

I won't be really able to test it, since disabling fas dormancy has come right before installing last version of rocketrom, which I am downloading now, so if the l2_hsic and/or multipdp problem will disappear, I won't be able to stick it for sure to either 4.0.4 or disabled fast dormancy.
[Galaxy Note GT-N7000 Q&A, Help & Troubleshooting] Braxos:
Tried the fast dormancy on 4.0.3 didn't help with l2_hsic. I couldn't see an improvement of battery with dormancy on and off. Using eplus on Germany (Aldi talk 5gb/month internet) they switched lately to fast dormancy if I am right between 2.3.6 to 4.0.3
[Galaxy Note GT-N7000 Q&A, Help & Troubleshooting] iconer:
How do i know if my carrier support fast dormancy? I would like to try that.
[Galaxy Note GT-N7000 Q&A, Help & Troubleshooting] ephestione:
@iconer

usually you either call their support, if the people there know it, or do a search on google.

Anyway, with fast dormancy disabled, and 4.0.4 on my phone, I don't notice any real improvement... I mean, what's less with l2_hsic has been taken by multipdp which is now the most powerhungry wakelock, deep sleep never goes much higher than 80% even if it should very well be around 95%
[Galaxy Note GT-N7000 Q&A, Help & Troubleshooting] skivnit:
For me it's battery monitor that's taking the lead now

Sent from my GT-I9300
[Galaxy Note GT-N7000 Q&A, Help & Troubleshooting] taha_e:
I experienced the same issue in my P7500 Gtab 10.1 (3g)

2 weeks ago I removed my sim card from tablet as my data plan was finished (removed the sim whilst tablet was on) and put my device in flight mode but continuously received notification for network discovery .

within this 2 weeks I tried to remove many applications , remove widgets,disable gps, and so many things but not effective and finally today just to try I reinsert sim and yesssss its gone no more l2_hsic

Just to try one more time I turned off device and insert sim and turned on again l2_hsic is back but this time battery drain is not so much,maybe 1% per hour

Different users may have different case but I think the main problem origins from network search or something similar, and I think this is a bug in ICS if you put in flight mode and the device still looking for network
[Galaxy Note GT-N7000 Q&A, Help & Troubleshooting] Tonio78370:
If 4.0.4 didn't fix it I'm almost 100% sure you have another problem. I used the first release and installed the second LRQ yesterday and both solved the L2_hsic problem for me.

Just read the 38 pages on the LRQ release and nobody talks about it anymore. You might want to try a clean install with wipe through GB.
[Galaxy Note GT-N7000 Q&A, Help & Troubleshooting] miniharo:
to date, l2_hsic isn't popping up. 4.0.3 was the buggy one. updating to 4.0.4 should remove l2_hsic. just head for the update!
[Galaxy Note GT-N7000 Q&A, Help & Troubleshooting] nodq:
No it doesn't. I am on 4.0.4 Galaxy S3. And this l2_hsic wakelock still kills my battery.
[Galaxy Note GT-N7000 Q&A, Help & Troubleshooting] bigmaxts:
Having bought 2 notes a week ago for my wife and myself. Both were 4.0.3 and randomly suffering of the l2_hsic. Have updated mine to the latest available 4.0.4 stock German firmware a day ago and it seems that the l2_hsic has gone now. 2 days ago first 2 hours after charge killed 10-11 percent, now first percent is gone in 2,5 hours. Usage is all the same. Will update wife's note over the weekend and will be testing further on both devices and updating here.
[Galaxy Note GT-N7000 Q&A, Help & Troubleshooting] kromosto:
got my note with 2.3.5 upgraded to 2.3.6 4.0.3 and 4.0.4. i am using lrt right now. never got this problem until yesterday. i discovered that it is because of an app i got from google play. its name is weaphone i uninstalled it reboot and now fine. so apps can give this error too.
[Galaxy Note GT-N7000 Q&A, Help & Troubleshooting] bigmaxts:
just a very quick update... 4.0.4 seems to be a solution for myself and my wife. Both notes are now on 4.0.4 latest German firmware and battery life seems to be awesome!!! Mine was charged 36 hours ago, and still 72% remains for me :) i am not so heavy user, but i do my normal activity - im, calls, wifi and cellular internet browsing, sms etc.... before that, my iphone 3gs was nearly dead in the evening with same load... and what is even better - the second device of my wife is doing pretty much same.... :) happy for now.
[Galaxy Note GT-N7000 Q&A, Help & Troubleshooting] nokiamodeln91:
i dont understand 4.0.4 is a solution but u r not on 4.0.4 ?
[Galaxy Note GT-N7000 Q&A, Help & Troubleshooting] anirudhgargi:
L2_HISC Wake lock explanation summary

HISC is the interface that connected the main Soc processor ( Also called Applciation Processor AP) to the modem ( 3G or 4G if there are two modems separately )

HSIC is used the standard USB core library. And it is stanrd given by usb.org. The HSIC by itself consumes very less power and is one of the very power efficient and space efficient ways of interconnecting chips. Currently common to Qualcomm and Sammy Exynos architectures.

The reason you seeing too many HSIC wake lock and other wake us's is due to the fact that the HSIC interface is waken up by modem (Normal scenarios are also so many) .

Also one imp reason is EFS sync. A concept : that the new modem architectures doesn't support a flash storage.(Saves lot of cost to manufacturer) .So every time modem needs to store something , it wakes up hisc interface and ask the AP (Main processor) to store it for him.

So this CP storing via AP is a fairy frequent activity.

I see the concern over this L2_hsic wake lock. I can say at this point that it is quite naturally and a necessary evil for smooth working of your modem( network 2g,3g,4g ) subsystem.

Hope this is of some help. :good:
[Galaxy Note GT-N7000 Q&A, Help & Troubleshooting] bigmaxts:
Sorry. that was a typo. I have corrected my post.

Both notes are on 4.0.4 and battery life is awesome. in my usage it lasts for 3 days (72 hours) + up to 10% remains when i put in on charger before going to sleep. Bu i am not so heavy user.... i have 2 gmail, another mailbox, whatsup, dropbox, evernote, weather sync enabled + calls, 3g and wifi browsing...

My wife manages to kill the battery in about 55-60 hours or so... On top of mine she uses gtalk for video calls over wifi.
[Galaxy Note GT-N7000 Q&A, Help & Troubleshooting] Phibs:
You are totally right.

I installed a uSIM card and the l2_hsic wakelock disappeared.

The problem is that i still have no deep sleep.

L2_hsic is not the only responsible for the deep sleep problem.

Thanks
[Galaxy Note GT-N7000 Q&A, Help & Troubleshooting] chiefnewin:
Hi

I'm running 4.0.4 on a Samsung S2 and are getting the L2_HSIC wavelock eating up my battery constantly (I'm currently having to charge my phone 1-2 a day) . I've tried clearing the system cache, rebooting after charging, disabling synch, WiFi & 3G but are still getting the same issue. I ran in flight mode for a period of time and the kernel still ran and used up the battery. Any advice would be appreciated as its rendering the phone pretty much useless

Thanks
[Galaxy Note GT-N7000 Q&A, Help & Troubleshooting] nokiamodeln91:
power off the phone. > remove the battery for 2 mins > pack it up > restart. check for that wakelock again. it should not be there for good
[Galaxy Note GT-N7000 Q&A, Help & Troubleshooting] chiefnewin:
Hi

I powered down the phone, removed the SIM, battery and SD card for 3-4 minutes and powered back up but the l2_hsic still starts. Any other fixes?
[Galaxy Note GT-N7000 Q&A, Help & Troubleshooting] nokiamodeln91:
i have it there always but for a very short period of time. 4 mins in 24 hrs or so. check how much is it in yours
[Galaxy Note GT-N7000 Q&A, Help & Troubleshooting] chiefnewin:
Seem to be getting it around 50% of the time . Have powered down and restarted numerous times and it seems to come back after a few minutes
[Galaxy Note GT-N7000 Q&A, Help & Troubleshooting] :
on Ultimate LSC build, I was fine for a few days on the AT&T WAP.Cingular APN. Switched to the PTA and added things like internet, hsirp, etc to the type. I think this may be the cause. I changed it to default, mms, supl will see what happens... I also flashed LRK modem. I am thinking the only thing i changed was the APN settings, so I am wondering if that was causing my huge l2_hsic wake lock... Just rebooted the phone and will let it fully charge and report back
[Galaxy Note GT-N7000 Q&A, Help & Troubleshooting] samdal:
I have had problems with massive random battery drain du to l2_hsic for a long time. I use Auto Airplane Mode and are always on airplane mode when screen is off. A few times I noticed several notifications coming from Gamelofts Asphalt 7 immediately after turning screen on, and then I got suspicious. I then forced notifications from Asphalt 7 off in Jelly Beans App Administration. After doing that, I have had no l2_hsic wake lock. I am at the time of writing with 60 % battery after 2h50min screen time and 3d22h since charging! (Galaxy Tab 10.1 P4 overclocked to 1.4 mhz). Problem solved for me:)
[Galaxy Note GT-N7000 Q&A, Help & Troubleshooting] ReneGee:
l2_hsic Stiffmeister Rom

The only ROM without l2_hsic DS problems seems to be this Stiffmeister Rom ( google it )

Coming from P7500ZCLP9_P7500OZHLP9_CHN

CM10 developers should have a look at this and modify their kernels, which all have the l2_hsic problem.
[Galaxy Note GT-N7000 Q&A, Help & Troubleshooting] Anne Droid:
Hi folks,

What a relief to have found this thread!

I have been battling with this l2_hsic problem for a few weeks. I have a Samsung Galaxy Tab 10.1 3G option (GT-P7500). My problems seem to coincide with updating to Android 4.0.4 about 6 weeks ago. My tab is not rooted. I am in the UK and carrier is Vodafone.

I noticed towards the end of this thread that some people have found Android 4.0.4 to be better than Android 4.0.3 regarding the l2_hsic problem. If that's the case, then I'm pleased I never had 4.0.3! With Android 4.0.4, my tab is lucky if it gets 10% deep sleep (that is overnight with display, WiFi, mobile data, bluetooth and GPS all off). Battery capacity falls at 1.4% per hour overnight.

As a result of reading many posts on this thread, I have disabled WiFi/Mobile Data from the location services. We will see what happens.

Finally, for the moment, I must echo others' concerns about Samsung's customer support (!!). Here in the UK, I have contacted them several times. The support I have received has been abysmal. And, on reading how long this problem has been going on, I am appalled. Here in the UK, we have a TV programme called Watchdog (BBC). I wonder if we in the UK could get the BBC interested in this one.

I will add to this thread when I have something else to report.

AD
[Galaxy Note GT-N7000 Q&A, Help & Troubleshooting] Anne Droid:
Hi folks,

Me again!

I monitored my tab overnight using BBS - l2_hsic was active 72% of the time. The location setting "Use wireless networks" was disabled throughout - as was the GPS option (not that this was a suspect anyway). The third option, "Location and Google Search" was left enabled but I'll repeat the test with this also disabled.

So, I still have not solved this problem.

AD
[Galaxy Note GT-N7000 Q&A, Help & Troubleshooting] :
Re: L2_hsic (latest update 14/02/13)

+1

Sent from my GT-N7000000000 using Tapastalker 2
[Galaxy Note GT-N7000 Q&A, Help & Troubleshooting] Anne Droid:
Hi folks,

Repeated the above with "Location and Google Search" disabled. Still a problem.

I have written to the BBC's Watchdog TV programme to see if they would be interested in investigating this sorry state of affairs with Samsung UK. I also plan to write to Samsung's corporate UK HQ. Has anyone else done anything on similar lines, either in the UK or elsewhere?

AD