[UMi ZERO Questions & Answers] drodero:
I'm using 3.09 ROM (but occurs with all ROMs):

Unexpected reboots occur only when screen off, specially if I've switched off the screen manually.

For testing I set the phone storage as default storage instead of the SD storage. From then, I've reduced to half reboots in a day... I've been getting around 10 reboots in a day, now 5.

Also I tried to write system logs in sdcard until reboot happens.

I installed a SSH apk in my UMI: https://play.google.com/store/apps/details?id=web.oss.sshsftpDaemon&hl=es

I connected via ssh from your computer and executed:

"cat /proc/kmsg > /storage/sdcard1/log.log &"

Then : exit from ssh session, close android ssh app.

It seems there must be a problem with kernel or governor when switching off/on cpu's when UMI comes back from sleep.

Last lines before reboot:

<5>[11919.129381] (0)[18972:kworker/u:5][SLP] [MENTION=522570 [MENTION=5839521 [MENTION=1065870 [MENTION=1879310]@@@[/MENTION][/MENTION][/MENTION]@[/MENTION] [MENTION=522570 [MENTION=5839521 [MENTION=1065870 [MENTION=1879310]@@@[/MENTION][/MENTION][/MENTION]@[/MENTION]@@@

<5>[11919.129393] (0)[18972:kworker/u:5][SLP] Chip_pm_end

<5>[11919.129403] (0)[18972:kworker/u:5][SLP] [MENTION=522570 [MENTION=5839521 [MENTION=1065870 [MENTION=1879310]@@@[/MENTION][/MENTION][/MENTION]@[/MENTION] [MENTION=522570 [MENTION=5839521 [MENTION=1065870 [MENTION=1879310]@@@[/MENTION][/MENTION][/MENTION]@[/MENTION]@@@

<4>[11919.129415] (0)[18972:kworker/u:5]Restarting tasks ... done.

<6>[11919.139172] (0)[18972:kworker/u:5][pm_notifier_call_chain]: there are 4 notify callbacks, event = 4

<6>[11919.139241] (0)[18972:kworker/u:5]msdc: 0,mmc_schedule_delayed_work ret= 1

<6>[11919.139280] (0)[18972:kworker/u:5]msdc: 1,mmc_schedule_delayed_work ret= 1

<6>[11919.139303] (0)[18972:kworker/u:5]PM: suspend exit 2015-04-04 14:36:14.414863846 UTC

<6>[11919.139345] (0)[18972:kworker/u:5]active wakeup source: event6-742

<6>[11919.139358] (0)[18972:kworker/u:5]active wakeup source: event1-742

<6>[11919.139368] (0)[18972:kworker/u:5]active wakeup source: event2-742

<6>[11919.139379] (0)[18972:kworker/u:5]active wakeup source: event5-742

<6>[11919.139389] (0)[18972:kworker/u:5]active wakeup source: event0-742

<6>[11919.139400] (0)[18972:kworker/u:5]active wakeup source: event4-742

<6>[11919.139419] (0)[18972:kworker/u:5]active wakeup source: alarm

<6>[11919.139431] (0)[18972:kworker/u:5]active wakeup source: pmicAuxadc irq wakelock

<6>[11919.139442] (0)[18972:kworker/u:5]active wakeup source: EINT wakelock

PMIC6323 Module code: https://android.googlesource.com/ke...vers/misc/mediatek/power/mt6582/pmic_mt6323.c

MT6323 is a power management system chip optimized for 2G/3G handsets and smart phones. Handles all 2G/3G/smart phone baseband power management .

PMIC 6323 datasheet: http://www.datasheet-pdf.com/datasheet-html/M/T/6/MT6323_MEDIATEK.pdf.html

I tried putting SIM in SIM2 slot (MicroSD slot) , disabling GPS, smart screen and air gesture, using Dalvik/ART, 3G data disabled... but still reboots.

In battery menu I can't disable power saving mode, I uncheck the box, but when I exit menu and enter to battery menu, the checkbox is marked again.

Now I'm looking for a 1,7GHz kernel (UMI ROM V3.09). Can anyone share it, please?