Hello, thank you for taking the time to open this bug report.
Can you please run the command "apport-collect 2081037" to include the
logs and system information so we can look into this please?
** Changed in: linux (Ubuntu)
Assignee: (unassigned) => Philip Cox (philcox)
** Changed in: linux (Ubuntu)
Status: New => Incomplete
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https://bugs.launchpad.net/bugs/2081037
Title:
LG Gram screen brightness hot keys and battery charge limit regression
Status in linux package in Ubuntu:
Incomplete
Bug description:
I'm running Xubuntu 24.04 with all packages up to date on an LG Gram
14ZD90Q. It's been upgraded in place since 23.04. When I first
installed it, Xubuntu supported the Fn+F2/Fn+F3 screen brightness hot
keys out of the box. They stopped working a couple of weeks ago. It's
hard to pin down an exact cause, but I did install a kernel update
around the same time. Some other Fn+FX hot keys still work (volume
controls and keyboard backlighting). The remaining Fn+FX hot keys
don't work, but I'm not sure whether that's a regression since I
wasn't using them before noticing this bug.
In addition, the battery charge limit threshold is no longer working.
Per the "Battery care limit" instructions at
https://docs.kernel.org/admin-guide/laptops/lg-laptop.html I had set
the charge limit to 80%. Now it no longer has any effect.
```sh
root@gram:~# cat /sys/class/power_supply/CMB0/charge_control_end_threshold
0
root@gram:~# echo 80 >
/sys/class/power_supply/CMB0/charge_control_end_threshold
root@gram:~# cat /sys/class/power_supply/CMB0/charge_control_end_threshold
0
root@gram:~# echo 100 >
/sys/class/power_supply/CMB0/charge_control_end_threshold
root@gram:~# cat /sys/class/power_supply/CMB0/charge_control_end_threshold
0
root@gram:~# echo 50 >
/sys/class/power_supply/CMB0/charge_control_end_threshold
bash: echo: write error: Invalid argument
```
Both of the supported values 80 and 100 are accepted, but don't take
effect. An invalid value throws an error as previously.
This may be related to upstream bug
https://bugzilla.kernel.org/show_bug.cgi?id=204913.
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