cris@cris-Compaq-CQ58-Notebook-PC:~$ grep -i  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=! "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=! "acpi_osi=Windows 2012"
[    0.157359] ACPI: Disabled all _OSI OS vendors
[    0.157362] ACPI: Added _OSI(Module Device)
[    0.157363] ACPI: Added _OSI(Processor Device)
[    0.157364] ACPI: Added _OSI(3.0 _SCP Extensions)
[    0.157365] ACPI: Added _OSI(Processor Aggregator Device)
[    0.157367] ACPI: Added _OSI(Windows 2012)
[    0.162566] [Firmware Bug]: ACPI: BIOS _OSI(Linux) query ignored
[    2.208364] hidraw: raw HID events driver (C) Jiri Kosina