I just upgraded to Ubuntu 24.10, and this issue seems to be fixed. It's unfortunate that the bug affects the LTS release, but whatever the underlying cause was, it seems to be solved going forwards.
-- 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. --- ProblemType: Bug ApportVersion: 2.28.1-0ubuntu3.1 Architecture: amd64 AudioDevicesInUse: USER PID ACCESS COMMAND /dev/snd/seq: pete 1564 F.... pipewire /dev/snd/controlC0: pete 1564 F.... pipewire pete 1566 F.... wireplumber CRDA: N/A CasperMD5CheckResult: pass CurrentDesktop: XFCE DistroRelease: Ubuntu 24.04 InstallationDate: Installed on 2023-03-25 (545 days ago) InstallationMedia: Xubuntu 22.10 "Kinetic Kudu" - Release amd64 (20221018) MachineType: LG Electronics 14ZD90Q-G.AX56A5 Package: linux (not installed) ProcFB: 0 i915drmfb ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-6.8.0-45-generic root=UUID=e4fb412b-8244-40b5-90d3-b873747955a2 ro ProcVersionSignature: Ubuntu 6.8.0-45.45-generic 6.8.12 PulseList: Error: command ['pacmd', 'list'] failed with exit code 1: No PulseAudio daemon running, or not running as session daemon. RelatedPackageVersions: linux-restricted-modules-6.8.0-45-generic N/A linux-backports-modules-6.8.0-45-generic N/A linux-firmware 20240318.git3b128b60-0ubuntu2.3 Tags: noble Uname: Linux 6.8.0-45-generic x86_64 UnreportableReason: This report is about a package that is not installed. UpgradeStatus: No upgrade log present (probably fresh install) UserGroups: adm cdrom dip docker kvm libvirt lpadmin lxd plugdev sambashare sudo _MarkForUpload: False dmi.bios.date: 08/23/2022 dmi.bios.release: 0.1 dmi.bios.vendor: Phoenix Technologies Ltd. dmi.bios.version: A1ZG0400 X64 dmi.board.asset.tag: Base Board Asset Tag dmi.board.name: 14Z90Q dmi.board.vendor: LG Electronics dmi.board.version: FAB1 dmi.chassis.asset.tag: Asset Tag dmi.chassis.type: 10 dmi.chassis.vendor: LG Electronics dmi.chassis.version: 0.1 dmi.ec.firmware.release: 33.0 dmi.modalias: dmi:bvnPhoenixTechnologiesLtd.:bvrA1ZG0400X64:bd08/23/2022:br0.1:efr33.0:svnLGElectronics:pn14ZD90Q-G.AX56A5:pvr0.1:rvnLGElectronics:rn14Z90Q:rvrFAB1:cvnLGElectronics:ct10:cvr0.1:sku: dmi.product.family: LG gram PC dmi.product.name: 14ZD90Q-G.AX56A5 dmi.product.version: 0.1 dmi.sys.vendor: LG Electronics 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
