I was able to test older versions of SailfishOS (oldest I tried was 4.3.0.15) and still had the issue, so it is likely not caused by an upgrade.
The only thing I know has changed is my SIM card: I switched from a SIM card without VoLTE support to a SIM card with VoLTE support (same operator). Since disabling 4G helps with the issue, perhaps this is linked.
I started my investigation by looking at the logs of ofono with 4G enabled and with 2G. There are much more logs with 4G.
The logs with 4G contains a lot of these:
Can't parse modem-handled proactive command
I tried with the most recent ofono from upstream and it cannot parse the input either, so Iām assuming the data is just plain wrong.
Does any of you have this error in their ofono logs?
Could you please tell me how frequent you see lines added to the ofono logs while the phone is not in use with 4G enabled (and tell me if you have the battery drain issue or not)?
(With 4G enabled, I have a few dozens lines every minute, while with 2G, it I can see 10-20 minutes between 2 log lines.)
Iām not sure yet where the input comes from and if we have control over it, but Iāll continue my investigation.
This just got really annoying. Problem with this battery drain on Xa2 models exists since 4.4.0.72 (4.4.0.68 in my case was the last ok state).
Recently I was planning to completly refresh my 10 III so I needed a backup phone so I dusted off my old trusty XA2. Flashed it with 5.0.0.62. I did remember about the battery drain problem but assumed that it is already relic of the past. As it turned out it isnātā¦
Lipstic continue to destroy battery life running about 10-12% of cup all the time even when itās not doing anything. Iām almost completly sure that problem is caused by lipstic as on 10 III the same process sits lower than 1% of cpu.
I couldnāt really get it to work properly. Only workaround that I know of, and this is at least abnormal - is to flash the device to 4.4.0.68 and go through all the updates up until the last release. Now lipstic sits at 1-2% of cpu usage.
I also see that some reported different causes with different/no solutions yet. In my case it is relatively easy to get it working properly but it seems like Jolla isnāt really give that much to old devices. Which considering their current state is understandable, but shouldnāt be like this.
OFFTOP WARNING
I returned my C2 after few weeks because jolla started project with completly obsolete phone when they have XA2 platforms almost figured out. By the way, not considering battery drain XA2 performs much better than C2. This I cannot understand.
