[JiaYu S3 ROMs, Kernels, Recoveries, & Other Develo] yossSP:
Report of use about RR Stable 21

I have tested all versions of this RR and I decided to stay in Stable 21, the last one builded by the official maintainer, [MENTION=7698574]sandstranger[/MENTION] .

It's a great ROM, my daily ROM since a long time, and after several weeks of daily use this is my report of use about this RR Stable 21:

Characteristics:

No Bluetooth loss of signal!

Good camera quality.

Full Substratum support.

Very stable (isolated FC seems corrected with Kernel Adiutor fix).

Very fluid, until the end of the day.

Lots of configuration options (it's an RR)

Android 7.1.2 NJH47F Compilation of August 2017.

Kernel based on version 3.10.108 of November 2017.

December Google Security Patch (r36) , safe from Blueborne and Krak

Z-RAM, can be especially useful on 2 GByte RAM model. Can be activated with applications such as Kernel Adiutor (the one I use) and others that allow to activate kernel options.

SDCardFS file system active (improves access to SD card and data/media).

F2FS support on partitions /data and /cache.

exFAT support on SD card.

Multiple libraries updated with native Nougat sources.

GPS fast to get fix, precise and identifies American, Russian and Chinese satellites.

Stable and fast wifi.

Good battery consumption. Over 4 hours of display in 18 hours of use.

Without fast charging support (max. 1.3A over AC and 500mA over USB)

Video playback without bugs.

With Magisk 14.5b and the SafetyNet module it passes the SafetyNet tests, but the bank's NFC payment app still fails.

Over 50,000 points in Antutu.

It allows to install from Google Play certain apps (like Netflix) that sometimes don't do on some other ROMs.

Bugs/limitations:

Stable voice and data connection almost all the time, but with random signal loss with fast reconnection (I use 4G auto directive). It completely looses voice/data signal and reconnect, the cut could lasts over a minute or two. It can occurs several times in an hour or could saty stable during hours, so it's random. It seems this bug depends on signal quality reception, it seems that the modem in this ROM have problems with signal reception. I tried other modems that has better 3G reception and they were far more stable, but they had the Bluetooth loss of signal bug :(

Exaggerated battery consumption with active Wifi, more notorious with screen off, when it doesn't enter well into DeepSleep. It happens to me in all Nougat ROMs. I manage with Wifi off normally and manually connecting when I need to make transfers of high volume data.

FC using default camera app with night mode in very low light conditions, it doesn't occurs with other camera apps.

Send display wirelessly to smartTV doesn't work.

Wifi Tethering is broken, 5Ghz hangs and 2.4Ghz connects but it doesn't give access to Internet (it works fine on RR Stable 17): I manage using USB tethering.

EngineerMode app can't save lot's of values or do calibrations (Gyroscope, Gsensor...). (it works fine on RR Stable 17). Ive' got one reboot in the middle of a phone call, I think it could be related with a fail in the proximity sensor calibration.

Extra configuration applied:

750 Mbytes of Z-RAM activated

Greenify configured to hinernate no critic apps.

Data & Caché partitions F2FS formatted.

microSD exFAT formatted.

Last GApps Pico, Magisk 14.5 (1456) and Dolby Atmos installed from Recovery

In summary, as previous builds, it's a very pleasant ROM for daily use, with a few bugs I can live with, so until we could get and Oreo at the level of this RR, I'll stay comfortably here.

And now, the wishes of future: Can we expect a new official build from [MENTION=7698574]sandstranger[/MENTION] with the next aspects included?

Last RR sources included

January/February Google Security Patch

Wifi Tethering working as was on RR Stable 17.

EngineerMode app saving values and doing fine calibrations (Gyroscope, Gsensor...) as worked on RR Stable 17

As can be seen I only focus on issues that were working fine on past builds (and perhaps we can dream in having RIL cuts solved? ;) )

Finally and as usual, thank you very much, [MENTION=7698574]sandstranger[/MENTION] and MAD Team, for your efforts in Jiayu S3 development, trying to bring the last improvements to our mature but capable smartphone.