https://bugs.kde.org/show_bug.cgi?id=497200
Bug ID: 497200
Summary: Support "charge_types" alongside
"charge_start/end_threshold", no effect otherwise on
certain laptops
Classification: Plasma
Product: Powerdevil
Version: master
Platform: Other
OS: Linux
Status: REPORTED
Severity: normal
Priority: NOR
Component: general
Assignee: plasma-b...@kde.org
Reporter: parav...@debian.org
CC: natalie_clar...@yahoo.de
Target Milestone: ---
SUMMARY
I own a Dell Latitude laptop. While it has been possible to set charging
thresholds with `smbios-battery-ctl` for a few years now, Linux 6.12 added
support for the standard sysfs charge start/end thresholds in the `dell_laptop`
driver. This made powerdevil automatically detect said thresholds and report
them to the UI automatically. Neat!
```
# cat /sys/class/power_supply/BAT0/charge_control_{start,end}_threshold
70
85
```
However, the way the firmware works, exposed now by the driver, is that there
is a [`charge_types` attribute](https://lwn.net/Articles/989502/):
```
# cat /sys/class/power_supply/BAT0/charge_types
Trickle Fast Standard Adaptive [Custom]
```
The values are documented [in the patchset to be identical to
`charge_type`](https://patchwork.kernel.org/project/linux-pm/patch/20241108232438.269156-3-hdego...@redhat.com/)
(which doesn't exist on my system), and the kernel's [sysfs documentation
page](https://www.kernel.org/doc/Documentation/ABI/testing/sysfs-class-power).
Two things here:
- First, **a bug**: unless `charge_types` is set to `Custom`, **the start/end
thresholds sysfs entries have a value but take no effect**. powerdevil
incorrectly reports these thresholds (and allows one to change them). So at
minimum it should support reading, and perhaps writing, the value `Custom`.
- Second, a **feature request**: it'd be awesome for powerdevil to support
setting these different values. I primarily use `Custom` with 70-85 during
normal use, but when I leave for a long day (e.g. a trip), I set it to `Fast`.
Also see #14.
SOFTWARE/OS VERSIONS
Operating System: Debian GNU/Linux 12
KDE Plasma Version: 6.2.4
Kernel Version: 6.12.3-amd64 (64-bit)
Powerdevil 6.2.3, but verified with the code in the master branch.
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