https://bugzilla.kernel.org/show_bug.cgi?id=16391

           Summary: Hp Envy 14 Brightness Problem (ACPI brightness control
                    misses _BQC function)
           Product: ACPI
           Version: 2.5
          Platform: All
        OS/Version: Linux
              Tree: Mainline
            Status: NEW
          Severity: normal
          Priority: P1
         Component: ACPICA-Core
        AssignedTo: acpi_acpica-c...@kernel-bugs.osdl.org
        ReportedBy: loha...@gmail.com
        Regression: No


On the hp envy 14 you are unable to change the brightness of the lcd screen
information below


dmesg | grep bright
[    0.843789] [Firmware Bug]: ACPI: ACPI brightness control misses _BQC
function
[    0.844882] [Firmware Bug]: ACPI: ACPI brightness control misses _BQC
function
[    0.854443] [Firmware Bug]: ACPI: ACPI brightness control misses _BQC
function
[    1.818885] [Firmware Bug]: ACPI: ACPI brightness control misses _BQC
function
[    1.818913] [Firmware Bug]: ACPI: ACPI brightness control misses _BQC
function


Linux envy 2.6.32-23-generic #37-Ubuntu SMP Fri Jun 11 08:03:28 UTC 2010 x86_64
GNU/Linux

acpi # cat info 
version:                 20090903

If you need anymore information please let me know and i will provide it

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