Ubuntu
linux package

  1. Bug #1283589
  2. Comment #99

Comment 99 for bug 1283589

Revision history for this message
In , equilibriumtr (equilibriumtr-linux-kernel-bugs) wrote :

Adding

acpi_osi='!Windows 2012'

to GRUB_CMDLINE_LINUX_DEFAULT in /etc/default/grub seems to have fixed the problem for me (linked to the solution given in the comments on https://bugs.launchpad.net/ubuntu/+source/acpi/+bug/971061 ). The fix seems permanent; after about 10 reboots and 15 sleeps, the battery's charge/discharge states are still detected correctly. On top of that, the keyboard backlight started and is still working too :) It adjusts the brightness automatically according to the ambient light. Adjustment from keyboard (Fn+F9, Fn+F10) still has no effect though.

I am on the following configuration:

-Samsung NP900X4C
-Kubuntu 12.04.2
-Kernel 3.10.4-031004-generic
-BIOS P08ABK
-acpid-2.0.10