Work well. Thank you. ** Tags removed: verification-needed-cosmic ** Tags added: verification-done-cosmic
-- 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/1812099 Title: 4.18.0 thinkpad_acpi : thresholds for BAT1 not writable Status in linux package in Ubuntu: Fix Released Status in linux source package in Cosmic: Fix Committed Bug description: [Problem description] Kernel 4.17 introduced a new interface to set charge thresholds: The interface remained unchanged with 4.18. There's a bug preventing writing the charge thresholds for the secondary battery (BAT1). [Impact] ThinkPads with two batteries (ThinkPad "power bridge") e.g. X240, T440(s), X250, T450(s), X260, T460(s), X270, T470(s) et al. [Steps to reproduce] echo 42 > /sys/class/power_supply/BAT1/charge_start_threshold bash: echo: write error: No such device echo 42 > /sys/class/power_supply/BAT0/charge_start_threshold -- primary battery works! [Fix] Problem was fixed in 4.19: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/drivers/platform/x86/thinkpad_acpi.c?h=v4.19.15&id=d22296d9c38fd29a96bb5079fb8d17cee278f40e I propose to cherry-pick the patch for 4.18. [Test Case] See above, a patched 4.18 works for T450s. [Regression Potential] Low. This patch only applies to several ThinkPad machines, and after applying this patch, charge_start/stop_threshold work for BAT0 and BAT. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1812099/+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
