SailFish OS version: 4.5.0.19
Android Support: licensed but usually not running
Hardware: Xperia 10 II
During and after the bluetooth use the CPU is kept running high:
in my case, for days systemd-udev was using a lot of CPU time until I did:
systemctl restart systemd-udev
Unless and until a solution will be found, I suggest to add the execution of this command each time the bluetooth is disable by the top-menu (or from everywhere else).
UPDATE #1
The problem is not only related to bluetooth. The full restarting line is here below:
systemctl restart systemd-udevd systemd-udevd-kernel.socket \
systemd-udevd-control.socket
Moreover, this command helps to debug the problem with the service:
/usr/lib/systemd/systemd-udevd -D
UPDATE #2
I created a patch to fix some rules for udev and now does not complains anymore about errors, at least. I released the patch in ALPHA state because I did not tested extensively it.
UPDATE #3
I wrote a script that collect data about the amount of the current that the smartphone (Xperia 10 II) sucks form the battery and this is an example:
Battery status: discharging
log: /root/.batt_curr_stats.log
data set: 1965 items
now: -337 mA
min: -59 mA
max: -801 mA
avg: -232 mA ( 1 minute)
avg: -252 mA ( 2 minute)
avg: -234 mA ( 5 minute)
avg: -248 mA (10 minute)
avg: -235 mA (15 minute)
Unfortunately I discovered that sleep 1 is not as reliable as much as in other GNU/Linux systems. In fact, its time jittering is quite HUGE and it lasts between 1s and 2.6s.
UPDATE #4
After this modding:
Listening music from 4G mobile date streaming with a bluetooth headphones will raise the battery drain from 6%/h (daylight power save mode) to 8%/h which is acceptable (12h of music listening). Therefore, the issue can be considered having a solution.