Public bug reported: 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. ** Affects: linux (Ubuntu) Importance: Undecided Status: New ** Attachment added: "version.log" https://bugs.launchpad.net/bugs/2081037/+attachment/5818874/+files/version.log -- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux in Ubuntu. https://bugs.launchpad.net/bugs/2081037 Title: LG Gram screen brightness hot keys and battery charge limit regression Status in linux package in Ubuntu: New 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. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/2081037/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : kernel-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp
