The failure, battery: (dis)charge rate invalid is due to kernel complain about the firmware report the negative Present Rate on the _BST method
the comment on kernel driver/acpi/battery.c, /* For buggy DSDTs that report negative 16-bit values for either * charging or discharging current and/or report 0 as 65536 * due to bad math. */ kernel has workarounded it with using the ABS() positive value. battery->rate_now = abs((s16)battery->rate_now); ** Changed in: linux-lts-raring (Ubuntu) Status: Triaged => Won't Fix -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1250354 Title: [Dell Inspiron 5737] fwts reported high failure about klog[Firmware Bug]: battery: (dis)charge rate invalid. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux-lts-raring/+bug/1250354/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs