cris@cris-Compaq-CQ58-Notebook-PC:~$ grep osi /var/log/dmesg
[    0.000000] Command line: BOOT_IMAGE=/boot/vmlinuz-3.19.0-25-generic root=UUID=95ee305c-8ea0-48d5-97ed-78bdd1f9bf7a ro quiet splash vt.handoff=7 "acpi_osi=Windows 2012"
[    0.000000] Kernel command line: BOOT_IMAGE=/boot/vmlinuz-3.19.0-25-generic root=UUID=95ee305c-8ea0-48d5-97ed-78bdd1f9bf7a ro quiet splash vt.handoff=7 "acpi_osi=Windows 2012"
[    2.204063] hidraw: raw HID events driver (C) Jiri Kosina