Alarm clock is not ringing when the alarm time is coming

[liufeng]

system-image-cli -i
current build number: 60
device name: krillin
channel: ubuntu-touch/rc-proposed/bq-aquaris.en
last update: 2015-07-08 15:05:22
version version: 60
version ubuntu: 20150708
version device: 20150529-8e13c5f
version custom: 20150528-722-29-15-vivid

step by step
1.Open system setting -Time&date,change Time zone to UTC+8. the date and time is right.
2.Open clock app,you will see that there are four hours difference between clock time and actual time. such as actucal time is 16:00,clock time is 12:00.
3.Set an alarm, such as ,set alarm to 16:01, then alarm displays 12:01,wait for it ringing.
Expected result:
Alarm is ringing normally.
Actual result
After step 3,Alarm is not ringing. but before it ringing , the alarm displays "(12:01 AM alarm in 1m)".when alarm time is coming.it is not ringing.

[Stefan Mikulaj (stefanmikulaj-k)]

My alarm failed couple of times after OTA-9 . The alarm says ,,PASSED,, and the field stays green a ticked. Ther was no sound at the time of alarm. This needs to be fixed as soon as possible.
Stabke channek, OTA-9, Meizu MX4

[Stefan Mikulaj (stefanmikulaj-k)]

here is the syslog of that period of the day when it happened.
I was browsing internet upon setting up the alarm, then closed browser and then after 45 min the alarm failed.
See the attachment.