Schedule: Thursday 2025-05-22T07:00:00Z 
Sailfish OS Community Calendar (ICS format)
Topic proposals for the meeting:
- Add your name/nick using the template below to suggest a topic.
- Indicate how much time you’ll need so we can time-box the meeting accordingly.
- Please be as thorough as you can with your question/topic.
- If you can’t make the meeting please ask and name a substitute.
It is expected that you show up and present your topic, or name a substitute and make sure they attend in your absence. These IRC meetings are for real time participation and live discussions, otherwise you can post the topic on here and get responses that way.
We need you to be present to clarify details in the topic, and to ensure the discussion is leading to the answers you are looking for! If you do not participate or your question/topic isn’t clear enough it will be postponed. Also: always ask for more time than you anticipate your topic needs!
Please have your topics ready at least 3 days before the meeting so we can prepare good answers. Topics announced afterwards will be postponed to the next meeting.
Template for topic proposal: (post your topic proposals as comments to this forum topic).
- Name/IRC nick:
- Topic:
- Some details about the topic:
- Approx. time needed:
- Substitute (optional):
Open Pull Requests:
If you have, or know of, a pull request that’s been open for at least 3 weeks, but which you think deserves attention, please add a comment using the template below and we’ll consider it during the next meeting.
- Name/IRC nick:
- Open PR URL:
1 Like
- Name/IRC nick: Fingus
- Topic: Percentage display of Jolla C2 battery
- Some details about the topic:
The battery calibration of the percentage display on the Jolla C2 has a strange mapping/positve shifting. While the system shows 100% battery at “end” of charging, it sometimes continues to charge at 400mA and decreasing for 10-30 minutes until its really “full” - the System recognized that correctly then. When the battery-level falls below 20%, it drops very quickly (only a few minutes remain). The voltage of the battery is then 3.6 volts or lower, which indicates a miscalibration. Here in the forum, there are already some who have also observed and reported this. I do not consider this to be a hardware fault, as the battery voltages are within the permissible parameters. I could imagine it is defined in the device adaptation. Is there a way for you to easily change this mapping? Or its up to Reeder to change it in the Firmware/Driver?
- Approx. time needed: 5 Minutes
Charging:
Discharging-Drop under 25% and very fast under 20/15% with same load:
8 Likes
Some additional information:
C2 has /sys/class/power_supply/sc27xx-fgu/ (FGU is Fuel Gauge Unit). That sysfs location has sc27xx-fgu/debug/dump_info which AFAICS should show the current (heh!) calibration values. Sources for that driver: Linux Kernel (may not the exact one in use in the C2!)
5 Likes
The sysfs file just dumps the current state of the driver. The actual one-time calibration data is part of the device tree, which is stored somewhere in the vendor_boot and dtbo partitions. A typical battery definition looks like this: ums9230-reeder-s19mps.dts line 64
The upstream Linux Kernel driver is a bit simpler than Unisoc’s version used in the C2 (probably kernel-sprd/drivers/power/supply/sc27xx_fuel_gauge.c at android-14-release-ula34 · MotorolaMobilityLLC/kernel-sprd · GitHub), but they both seem to start recalculating the charge based on the voltage only after the charge drops below a certain threshold. This should explain why the curve suddenly drops and suggests that it can be fixed by correcting the ocv-capacity-table in the device tree.
3 Likes
Name/IRC nick: Valorsogueriero97
Topic: When the video recording in Jolla Camera will be added for C2???
Some details about the topic: I think, have read that the C2 can’t yet natively record video, and it’s pretty… absurd. When this will be fixed? When we will have complete hw support for the C2? Otherwise I am not buying it 
Approx. time needed: 5 minutes
Substitute (optional):
2 Likes
Now that the C2 sources are available, here the supplementary link:
3 Likes
