Method (_Q14, 0, NotSerialized)
{
    If (^HKEY.MHKK (0x8000))
    {
        ^HKEY.MHKQ (0x1010)                // Vendor-specific event: TP_HKEY_EV_BRGHT_UP
    }

    If (NBCF) // Whether
    {
        If (VIGD)
        {
            Notify (^^^VID.LCD0, 0x86)     // Send 0x86 "Increase Brightness" to integrated graphics
        }
        Else
        {
            Notify (^^^PEG.VID.LCD0, 0x86) // Send 0x86 "Increase Brightness" to discrete graphics
        }
    }
    Else
    {
        Local0 = BRLV                      // Local variable to store current brightness level
        If ((Local0 != 0x0F))
        {
            Local0++
            BRLV = Local0
        }

        If (VIGD)
        {
            UCMS (0x16)                    // SMI access for integrated graphics
            BRNS ()
        }
        Else
        {
            VBRC (Local0)                  // SMI access for discrete graphics
        }

        ^HKEY.MHKQ (0x6050)                // Vendor-specific event: TP_HKEY_EV_BACKLIGHT_CHANGED
    }
}