[3.4.0.22] Voicecall-ui uses CPU on the background

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And to follow up on this, lipstick itself also suffers this problem from time to time. The trigger is unknown. Result of strace -c for lipstick:

[root@XperiaXA2 defaultuser]# time strace -p 20613 -c
strace: Process 20613 attached
^Cstrace: Process 20613 detached
% time     seconds  usecs/call     calls    errors syscall
------ ----------- ----------- --------- --------- ----------------
 78.88    0.351000         206      1702         7 poll
 16.18    0.072000          10      6789           clock_gettime
  4.72    0.021000          12      1703           epoll_wait
  0.22    0.001000         125         8           restart_syscall
  0.00    0.000000           0         6           read
------ ----------- ----------- --------- --------- ----------------
100.00    0.445000          43     10208         7 total
Command terminated by signal 2
real    1m 58.88s
user    0m 0.18s
sys     0m 1.15s

Is this method useless, or does lipstick (and voicecall-ui) indeed do a lot of clock_gettime for some reason? Can anyone confirm? Something else I can try?

Again, a few percent cpu usage on one core might not seem a lot, but it amounts to (I guestimate) 1%-2% battery usage per hour.

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