yashsingh1/xdaforums huggingface dataset:
[Xiaomi Redmi 1S] SH3H1:
Actually now we use CAF kernel with cherry picked armani changes implemented ! So i doubt it's that (i could be wrong :) )
[Xiaomi Redmi 1S] sathishcoumar:
I am also having the same problem.

With airplane mode on at night, battery drops by 20℅.

All apps were greenified.

Processor speed set at 300Mhz min and 998 MHz max.

Previously it was just 1 or 2 percent.

Sent from Redmi 1s with CyanogenMod M11
[Xiaomi Redmi 1S] gh0st3g:
Me too, battery drain too fast, on R17, my phone can get than more day, then on r18 i get only 16h. My phone using greenify all user app, and alway in sleep mode, may be go back r17
[Xiaomi Redmi 1S] mqweer56:
Battery Drain

When I kept my phone on power save and slept..it ended up going to 0% so I wondered why...when I tried to manually set the minimum frequency..it kept reverting back..it was not sticking​
[Xiaomi Redmi 1S] SH3H1:
To you guys and all others who have installed R18

Kra1o5 posted a zip package in htcmania for testing.,i've downloaded it and it is a kernel ! if you want to try :) ......

https://s.basketbuild.com/dlgate/devs?dev=Kra1o5&dl=Kra1o5/Xiaomi/armani/Test Zone/Test2.zip

It's a test version,i'll try and report !
[Xiaomi Redmi 1S] baunthiyal:
Link to thread on HTCMania...?

Sent from my Armani
[Xiaomi Redmi 1S] SH3H1:
Translated page :D

http://translate.googleusercontent....ge=156&usg=ALkJrhhufa3hmwL7D2tisADW3IDIiHS4hw
[Xiaomi Redmi 1S] mr.flipper:
Update.zip installed and the problems, battery drain and the min CPU freq, still there
[Xiaomi Redmi 1S] :
Logcats or GTFO

To All,

People if y'all posting bugs .. Please also attach Bug Reports [aka Logcats]

if you don't know how to logcat

See following links

[Tutorial] How To Logcat

http://xdaforums.com/showthread.php?t=1726238

CynogenMod Logcat

http://wiki.cyanogenmod.org/w/Doc:_debugging_with_logcat

How to Get useful Logs

http://xdaforums.com/showthread.php?t=2185929

Now Please don't Clutter the thread with "I GOT BUG" posts

"DO SOMETHING USEFUL"

Thank you
[Xiaomi Redmi 1S] onlyredmi:
Yes .. :o
[Xiaomi Redmi 1S] Luka12:
i think that is weird problem with cm. i have this problem with different phones with cm.

i cant change frequency, or i can change it difficult. i change min to 300, it comes back to 1.2 on its own :eek: after doing it 5 times, it finally saves setting.
[Xiaomi Redmi 1S] Angelina7:
Thank You Armani Devs

Thank you guys for such a wonderful work. You gave new life and hope for Redmi 1s.

R18 is just amazing. I hope you will continue development and fix the remaining issues when you can. So far we really really appreciate your efforts.

I am having two major issues, 01. Overnight battery drain 02. Earphone buttons are not working (I can confirm that none of these issues existed in R17).

Here is a logcat I saved during some music playback and pressing the earphone buttons a few times. I am using Xiaomi piston 2.

All the best wishes for you two. Cheers.
[Xiaomi Redmi 1S] Angelina7:
Hi, did you try disabling the option "enable per app profile" ? I used to have same problem setting min frequency, disabling per app profile solved it.
[Xiaomi Redmi 1S] mqweer56:
Tried that and then tried to change the minimum frequency...it reverts back to the max frequency after 5 seconds.. Doesn't stick :/ I tried using No-frills CPU control... Didn't work there as well :|

The ROM seems stable and I'm now experiencing less FC's of the launcher..but battery life has reduced drastically
[Xiaomi Redmi 1S] Luka12:
it helps to save it, but just for few min. after few minutes min frequency is same with max. VERY frustrating
[Xiaomi Redmi 1S] Angelina7:
Thats strange man, you may try device control root app from play store, and disable mpdecision. You can disable / check mpdecision from terminal app too. I am using cm11 from r16, yet to experience a single fc .. but I used to have regular fc with miui. Just hang on, hopefully battery drain issue will be fixed.

Anyone tried the patch and noticed battery improvement?
[Xiaomi Redmi 1S] onlyredmi:
Hi, try No Frills CPU App on playstore..

https://play.google.com/store/apps/details?id=it.sineo.android.noFrillsCPU

In settings > select > "Prevent changes from Other app".

Use CPU Spy to monitor frequencies

https://play.google.com/store/apps/details?id=com.bvalosek.cpuspy

Thanks
[Xiaomi Redmi 1S] Luka12:
i will try it.

but it would be nicer if we dont need another app. it would be nicer if cm would work.
[Xiaomi Redmi 1S] rajib1d:
battery drain

reverted to R18.. will wait for the issue to fixed...

---------- Post added at 10:08 AM ---------- Previous post was at 10:01 AM ----------

reverted to R16.. will wait for the issue to fixed in the next iteration...
[Xiaomi Redmi 1S] Luka12:
i came back to r16.

i tried r18 with different versions of gaaps. i tried newest one and one older. with both battery was bad on r18.
[Xiaomi Redmi 1S] MysticForce:
CM 11 R18 -> Heating problem is decreased drastically

Thank U jsevi83 and Kra1o5 for this wonderful CM rom and its developement .

I am in 2nd battery cycle ( 50% remaining )

1. Yes . Battery drain issue is there ;(

2. Heating problem is gone (hardly getting past 30 degree C and 35 Degree C while on charging )

3.Butter smooth performance

4. But its unable handle Whatsapp Spamming ( 300-1190 GHz) . MIUI v36 did able to handle all these spamming messages like a boss .

3. 1-2 system UI crashes (a. While using quizup app and Received a random call , b. While using apollo music player and unlocking the device

Wll stick with R18 till next update :o :D

PEACE
[Xiaomi Redmi 1S] uli-hh:
Kra1o5 has released an other test.zip:

https://s.basketbuild.com/filedl/dev...Zone/Test4.zip

Link to original post

I hope this will stop the battery drain problem.
[Xiaomi Redmi 1S] NiTrOwow:
R17

@OP

Have you guys looked in the following bugs??

Version R17 (20150130).

The bugs i found are:

1. Volume menu sometimes disappears(cannot change volume, need to go to settings volume to change or reboot)

2. Phone app to dial numbers (number keypad is bugged when i open it the second time it shows correctly, and not just half in the screen bottom)

3. 3G connection strength not always good compared to stock rom.

4. "Problem creating TUN interface: Possibly the tun.ko kernel module is not loaded in your Android Kernel" OpenVPN Connect & OpenVPN Android client.. Tried, tun.ko installer. No success.

5. vibrate feedback when typing sometimes disappears and then magically comes back.

All bugs besides the tun module are random, there is no wat but just luck to trigger it, else i would paste a logcat dump here..
[Xiaomi Redmi 1S] sherry_94:
U sure , u arent exaggerating about the heating bro ??? Its its true , i would be so so happy ??? I would jump to R18 , no matter what bugs it has over R16 . [emoji51]

Sent from a Walkie Talkie
[Xiaomi Redmi 1S] ashu00:
Try using feat VPN..

Cyanogenmod now doesn't includes tun.ko in source due to increasing number of devices...

Sent from T.A.R.D.I.S.
[Xiaomi Redmi 1S] Luka12:
If you want to help, send logcat
[Xiaomi Redmi 1S] akhilkumarco007:
did u try it ? and did it work?
[Xiaomi Redmi 1S] HanszRN:
I have flashed the test4.zip and it really works. No more issue about battery drain
[Xiaomi Redmi 1S] egyulev:
Sorry but I wouldn't agree with you. Even after Test4.zip fix the battery drain was still there. I went back to R17 until this only issue I had with R18 is resolved. Thanks to the devs!
[Xiaomi Redmi 1S] ajayajun:
I tried to downgrade from R18 to R16 through CMupdater(settings>system updates).. I downloaded the file.

End of the download it said MD5 file missing, please help
[Xiaomi Redmi 1S] MaCrocy:
Why I eperience a bad voice quality over calls?
[Xiaomi Redmi 1S] fefifofum:
It's probably the weather, do you have a cold?
[Xiaomi Redmi 1S] smustafasms:
Hahaha

I am using r18.. Not experiencing any single problm

ThAnks
[Xiaomi Redmi 1S] sinnerz2000:
Hmm I seem to be the only one with this issue, I freshly flashed R18 and I feel the videos are playing slower than usual, like lower framerate. Anybody else noticed this?
[Xiaomi Redmi 1S] bhu1:
What kind of videos? X264 videos are working properly. No hiccups.

---------- Post added at 09:33 PM ---------- Previous post was at 09:31 PM ----------

With this kernel, WiFi doesn't work. Its stuck on the ON BUTTON GRAYED OFF but the WiFi itself doesn't turns on. I tried clearing dalvik cache and cache and trued reflashing it one more time and it Still didn't work. Flashed back the original r18 zip and WiFi works again.
[Xiaomi Redmi 1S] Angelina7:
Flashed test4.zip an hour ago and also used wifi for a while .. didn't see any problem.

---------- Post added at 07:39 PM ---------- Previous post was at 07:36 PM ----------

How about earphone buttons? Are they working for you?
[Xiaomi Redmi 1S] sinnerz2000:
I have VGA resolution mp4 videos which I've downloaded from YouTube, there are no hiccups or stutters while playing what I'm saying is its playing a little in slow motion, not drastically slow.

EDIT- same with audio files
[Xiaomi Redmi 1S] NiTrOwow:
Alright, didn't know. Well have not found "feat vpn" client in the google app store.. So don't know.. Maybe i need to try a vpn cliënt with tap instead of tun.
[Xiaomi Redmi 1S] teddy0804:
hi dev, [MENTION=4517918]jsevi83[/MENTION] and [MENTION=6025582]Kra1o5[/MENTION]

the first impression what i feel the R18 is like the first cm-11-armani (R15/R16) with custom kernel. the R18 RAM has 880 mb unlike the previously build. and.. yes, the R18 has butter smooth performance :)

however, i know it still need more steps plan to make cm-11-armani even better... :cool:

and yup, i will stick with R18 till next update :)
[Xiaomi Redmi 1S] ansson:
flash Test2 - phone not sleep, flash Test4 - wifi not work. flash beast - wifi ok, sleep ok, but chat im+ not go to push mode and not sleep.
[Xiaomi Redmi 1S] BenSamte:
R18....

Even after flashing the Test4.zip battery drain issue while idle still persists. Tried it out last night with full charge 100%, morning 85%...on 2G.

Review: -

R18 is incredibly smooth, the best user experience till now of all ROMs which I've tried. ..

In-call audio quality which was the main problem with this CM11 is now fixed. Very good quality....

Speaker audio quality is also very good...

ES File Manager not hibernating properly....

Kernel frequencies can be properly locked only with TricksterMOD...

Don't know if it's just me - but I can't seem to change to 3G signal...2G showing always....although I'm on a 2G data pack - but earlier the 3G signal would come on when switched....

Camera quality also hugely improved......

Wi-Fi works properly.....
[Xiaomi Redmi 1S] ajayajun:
Any update on the above query?
[Xiaomi Redmi 1S] Gh0sT.RPG:
Download rom from browser/any download manager rather than cm updater. Md5 mis-match happens when downloaded file is corrupt!
[Xiaomi Redmi 1S] ashu00:
Play store shows incompatible device..

You can download it from http://www.featvpn.com/

Works fine..

Sent from T.A.R.D.I.S.
[Xiaomi Redmi 1S] mihir.mehta:
Sometimes it fails to save screenshot.

It keeps on showing "screenshot is being saved." In the notification.

Or it may happen that as i take screenshot, system ui stops and restarts
[Xiaomi Redmi 1S] Marius Cristian:
R18 2-3 days review

Pro:

1)It's fast,smooth,has nice animations,it gives a very nice feel when you're using the phone.Furthermore,themes are really a blessing.USE THEMES! It will blow your mind how awesome can be.

2)The performance is just awesome,I couldn't find any lag or anything similar.On performance profile I played asphalt 8 and couple more games WITHOUT ANY LAG !

3)VERY STABLE! Haven't experienced a single FC.

4)The battery back-up is good [ I removed many apps for system/app,especially google apps(except google services and playstore which are mandatory) in order to reduce unwanted wake-ups,useless ram consumption and have a lighter rom ].I also use Greenify,even if apps are VERY LITTLE SLOWER when you open them after being greenified,it's a HUGE BATTERY BOOSTER & RAM SAVER !

---So,as a conclusion it's good looking,fast,stable,high performance,medium battery back-up(depends on usage-got 14 hours of intense usage with 3g/music/youtube/browser/gaming and so on).

Cons:

1)I feel that camera could be better.I have experienced couple of issues but all of them are fixed now(experienced some issues with the flash but i think it was due to low battery.After a full charge and a restart,no issues ever since.However,I think quality was better on stock.

---So,as a conclusion,the camera isn't bad,it's stable for daily use but there's place for some improvements here and there.

Final thoughts: We finally have a 4.4.4 ROM which can be used as daily,and it's also does what every rom is supposed to do: BE BETTER THAN STOCK !

THANK YOU DEVELOPER,YOU'RE A GENIUS !
[Xiaomi Redmi 1S] Angelina7:
test4.zip improved battery backup a lot (atleast for me). Only thing I am missing is headphone button controls. And I hope at some point, Armani devs would be kind enough to include voltage control features at kernel level.
[Xiaomi Redmi 1S] sherry_94:
+1 for voltage control.... Temps would get under control

Sent from a Walkie Talkie
[Xiaomi Redmi 1S] Angelina7:
Voltage control would be interesting on Redmi 1s

I have this theory about redmi 1s overheating. But first of all let me be clear, I am no expert .. just another average Joe.

Qualcomm 400 processors operate best between 1.2 GHz and 1.4 GHz. 1.3 GHz is a good place. Other brands like Motorola use this processor at as low as 1.2 GHz. Xiaomi overclocked this cpu to 1.6 GHz to beat its competition at spec. They didn't have to really, because Redmi 1s would still beat them at price, but they did that anyway .. and by doing so they produced an overheating unstable device, turned a potential wonderful hardware into a hazard.

Now, in order to overclock, we all know that to get stability, we must increase cpu voltage. I guess Xiaomi had to increase voltage to make the device somewhat stable at 1.6 GHz. Increasing CPU voltage will always produce more heat and drain more power. Now even when we lower the cpu frequency .. the cpu is still overvoltaged, resulting unnecessary battery drain and heat.

A quad core cpu at 1 GHz is actually quite sufficient to run daily tasks. People like me who use their phone for mostly music and browsing doesn't need more than that. If we could lower the cpu voltage then we would be able to check this theory. Hopefully we would be able to do so in future .. if our kind devs allow us :fingers-crossed:
[Xiaomi Redmi 1S] sherry_94:
It doesnt work that way.....cpu isnt fed with same voltage at different frequencies .....There is a proper frequency table.....Look at any kernel with Voltage Control . .....lower the frequency , lower is the voltage and higher the freq, higher is the voltage .

My theory for overheating is , bad design or not enough heat sink .

Sent from a Walkie Talkie
[Xiaomi Redmi 1S] sinnerz2000:
It is not overclocked, snapdragon 400 is made to run at upto 1.6ghz from Qualcomm itself, the issue in redmi is the heatsink or the thermal dissipator used isn't doing its job well, its a hardware issue and cannot be solved by software tweaks, even after underclocking to 1.2ghz same as moto g my redmi's temp is way higher than it. Maybe someone can come up with some hardware mods for better cooling.
[Xiaomi Redmi 1S] faraaz3:
Hardware mods lol..attach a cooler

R17 had video playback issue which was solved in R18 but batterybdrain came in, so I'm back to R16 old is gold
[Xiaomi Redmi 1S] Angelina7:
I am sure you guys are right .. like I said I am no mobile expert.

Agreed about the hardware mod .. did some goggling and found this thread on XDA:

http://xdaforums.com/optimus-4x-hd/general/guide-homemade-heatsink-easy-to-make-t2971385

Looks interesting and very logical. Will see if I can give that a try.
[Xiaomi Redmi 1S] sherry_94:
I m definitely gonna try that

Sent from a Walkie Talkie
[Xiaomi Redmi 1S] Angelina7:
Cool be sure to let us know how it goes. I'll try it this weekend when I get some free time. I am wondering if using some thermal tape between device and foil would be useful.
[Xiaomi Redmi 1S] sherry_94:
Any thing that conducta heat well would be useful.....u need the aluminium to fit very tight with the phone.....at least at the heating areas

Sent from a Walkie Talkie
[Xiaomi Redmi 1S] DevendraMilmile121:
bug

V4a dirivers are not installing
[Xiaomi Redmi 1S] Gogeta:
Works for me
[Xiaomi Redmi 1S] DevendraMilmile121:
Not working for me I will retry to flash rom and tell u wait for a while
[Xiaomi Redmi 1S] Zeehan:
Itching to try this.

Any of you can get the exact layout of the antennas? Much appreciated :p

Anyone have a dead xiaomi 5200mah power bank? Please PM me :(
[Xiaomi Redmi 1S] Angelina7:
There are some reassembly video of Redmi 1s at YouTube. I'll see if I can point out antenna locations from them.
[Xiaomi Redmi 1S] ataralgin2:
Antenna is on bottom part of phone body - under battery.

HM1SW CM11 R18
[Xiaomi Redmi 1S] bhu1:
Moto g and redmi 1s doesn't use the same snapdragon 400 processors, there are different snapdragon 400 models with different clocking potentials so that companies can design their phones according to the heating requirement of the model they are using, xiaomi didn't design the heat sink properly for a phone that is meant to run at 1.6 GHz.
[Xiaomi Redmi 1S] adryyy:
R17 is much better in term of battery and is more smooth in the UI and apps (using stock kernel).

I experience HUGE, HUGE battery drain, even with custom kernel on R18. Also i tried the Test4.zip and it didn't improve anything.

Waiting for the R19, hope will be better ;).
[Xiaomi Redmi 1S] akhilkumarco007:
Yeah moto g uses msm8226 and xiaomi redmi 1s uses msm8228 and ours is designed to work at 1.6GHz not at 1.2ghz but xiaomi didn't design the phone correctly to dissipate the heat any company won't take a risk of overclocking a chip that to when its not built by them .... So the heating using somewhat due to ram management and improper design in the internals :(
[Xiaomi Redmi 1S] giorgoslouk:
Huge battery drain on my wife's phone too and poor sound quality on calls with the latest version.

They can hardly hear what she says during conversation.

Please fix these bugs.
[Xiaomi Redmi 1S] uli-hh:
Test4.zip did not work

Yesterday I've installed the Test4.zip with 100% battery but it didn't improve the problem.

50% within 23h!! With minimal usage - only WIFI and 2G standby.:(

With former releases I've had a battery life for over 5 days and 18% rest.

I hope we'll get a working solution soon.
[Xiaomi Redmi 1S] milan978:
I have heat problem on 3G internet use.(2G calls , 3G internet).big one.phone stutters.Will try allu heatsink.

results tommorow. :D
[Xiaomi Redmi 1S] card-us:
anyone experiencing overheat on R18..?? yesterday i had an overheat Redmi 1s on R18 even on standby with no activity at all my phone goes beyond 35 degree, sometime it even goes up heat, try with restart doesn't help, while onR17 didn't get these much of heat (except when playing games & movies)

as foer smoothness R18 is great at it
[Xiaomi Redmi 1S] ishant311:
Bugs

I have also facing some bugs in R17 and R18

* camera forced close (in r17)

* whtsapp+ forced close (in r17 and r18)

* phone gets toooo much heated from behind and down from the camera.. (r18)

*battery is draining like a hell!!!! 50% in 1hr! jus by using the whatsapp only!!! (r18)

*i have tried that Test2.zip but nothing was happened.. infact after flashing it wifi didnt work..

I have flashed this rom 3 times...

But before r17 its wirking very very very well.. thnx developers.. I appreciate ur works...:D
[Xiaomi Redmi 1S] bivash:
Need Best apps backup & restore APK for free

I need a free apps backup & restore apk ..

I tried Titanium but when i tried to restore an app like batman game it asks to for pro version....

Need Help....
[Xiaomi Redmi 1S] DeLonge:
i got battery drain on r18 stock kernel. there's alot of wake.

any help?
[Xiaomi Redmi 1S] rokban:
confused, which version of cm11 rc shall i install?
[Xiaomi Redmi 1S] ROMEOROCKZZ135:
I cant connect to pc and get mass storage

When I connect to pc i cant see the usb mass storagewithout that i can't upload videos of songs of pictures to the phone directly using a usb cable it is very hard please help me
[Xiaomi Redmi 1S] adewisman:
For thus of you who want to revert back to previous build (rom) just install the prev zip (i revert back to r16) clean cache and dalvick, you guys won't lost any data and apps, so I recommend anyone that can't face the bugs, drains and etc, just go back to R16 20150115. Anyway thanks for devs on making this rom available on our hh and surely hope you guys can overcome this so called bugs ..... Amiens
[Xiaomi Redmi 1S] Berinjo:
lok at this video: https://www.youtube.com/watch?v=qHj_JXJ1OT0

and if you solve this, please post a screnshoots cause many people have the same problems with signal...

thx in advance :good:
[Xiaomi Redmi 1S] rokban:
where to find RC16? the current link is starting the download of rc18...
[Xiaomi Redmi 1S] ଲଂକାଧିଶ ରାବଣ:
Solution

There are many way to do it.

1. Goto >setting >about phone>cmupdate>check for update>

2.It will show all the versions released so far

3.For rc16 click on cm-11-20150115-Unofficial
[Xiaomi Redmi 1S] rokban:
thanks, actually i am on Mokee Rom, but anyway got it through googling :)
[Xiaomi Redmi 1S] Luka12:
r16
[Xiaomi Redmi 1S] anuragsood:
Try File Expert..
[Xiaomi Redmi 1S] sharan.nyn:
Check out the new thread on heatsink here

http://xdaforums.com/redmi-1s/general/diy-heatsink-mod-t3034181

Please post your comments there :)
[Xiaomi Redmi 1S] uli-hh:
these heat sink stuff is quiet a bit off topic here:rolleyes:
[Xiaomi Redmi 1S] sinnerz2000:
Create a new thread for this and we can share our thoughts there
[Xiaomi Redmi 1S] sharan.nyn:
Thread created :)

http://xdaforums.com/redmi-1s/general/diy-heatsink-mod-t3034181
[Xiaomi Redmi 1S] Marius Cristian:
[MENTION=4517918]jsevi83[/MENTION] I have a question about CPU temperature.On stock rom,the phone had that thermal engine control,and when the CPU got too hot it dropped the frequency under 1 ghz.Now on CM11,we don't have that,so if I play a game for too long,how I know the CPU won't burn?I played Asphalt 8 for about half an hour and the phone was hot like hell.Can you provide us more informations about this ? Thank you !
[Xiaomi Redmi 1S] fefifofum:
We included thermal control in cm-11.0 long time ago, it should be working fine. Let us publish a new build with the battery drain issue fixed and then we can start looking into other bugs from there.
[Xiaomi Redmi 1S] Angelina7:
Thank you [MENTION=4517918]jsevi83[/MENTION] We are grateful to you for this wonderful rom.

Just wondering if you have any plan to fix headphone button controls at next update.
[Xiaomi Redmi 1S] bilakos10:
I am pretty sure that fefifofum & kra1o5 will solve every issue in the future. But for the time being they are working on fixing the standby battery drain problem.

PS. Looking at their GitHub repo, there are some changes having to do with power management modules. I beleive the solution has been found!
[Xiaomi Redmi 1S] sinnerz2000:
We're gonna get kitkat in like 2 weeks with kitkat kernel and hopefully updated sources, then we can finally have a fully stable ROM. [MENTION=4517918]jsevi83[/MENTION] any fix for HDR for now?
[Xiaomi Redmi 1S] bilakos10:
I don't beleive that Xiaomi will update their published sources to KK. I mean we waited close to a year to get their outdated JB source... ;)
[Xiaomi Redmi 1S] phreakenstein:
Is it just me or trebuchet (default cyanogenmod launcher) forgets wallpaper on someone else's phone too?
[Xiaomi Redmi 1S] :
nothing for now.. for HDR we need camera wrapper for our camera libs
[Xiaomi Redmi 1S] Angelina7:
Yeah don't expect to see Xiaomi KK kernel sources any time soon .. and really who cares? Current CM11 armani kernel is quite close to perfection. And I have more faith on Armani devs than Xiaomi devs to write better codes.
[Xiaomi Redmi 1S] Cican49:
The camera bug is annoying in my opinion. No matter how much i reflash it,it will stuck again sometimes and device must be rebooted for the camera to work again. Well just sharing my opinion though,still loving the rom so much :)

Sent from my HM 1S