[Bug 212786] Screen brightness buttons do not trigger event HP 8460p

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=212786

            Bug ID: 212786
           Summary: Screen brightness buttons do not trigger event HP
                    8460p
           Product: Base System
           Version: 11.0-RC1
          Hardware: amd64
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: conf
          Assignee: freebsd-bugs at FreeBSD.org
          Reporter: edsalsen+freebsd at gmail.com
                CC: freebsd-amd64 at FreeBSD.org
                CC: freebsd-amd64 at FreeBSD.org

I FreeBSD 11.0-RC3, 
I can change screen brightness with sysctl:

root at bsd-esalgado:/usr/home/esalgado # sysctl hw.acpi.video.lcd0.brightness=60
hw.acpi.video.lcd0.brightness: 70 -> 60

When pushing screen brightness control buttons, nothing happens.

Using xev, I can see that no event is triggered when pushing those buttons:

KeyPress event, serial 36, synthetic NO, window 0x2000001,
    root 0xb6, subw 0x0, time 613282, (166,-15), root:(427,234),
    state 0x0, keycode 146 (keysym 0x0, NoSymbol), same_screen YES,
    XLookupString gives 0 bytes: 
    XmbLookupString gives 0 bytes: 
    XFilterEvent returns: False

KeyRelease event, serial 36, synthetic NO, window 0x2000001,
    root 0xb6, subw 0x0, time 613383, (166,-15), root:(427,234),
    state 0x0, keycode 146 (keysym 0x0, NoSymbol), same_screen YES,
    XLookupString gives 0 bytes: 
    XFilterEvent returns: False

KeyPress event, serial 36, synthetic NO, window 0x2000001,
    root 0xb6, subw 0x0, time 613858, (166,-15), root:(427,234),
    state 0x0, keycode 151 (keysym 0x0, NoSymbol), same_screen YES,
    XLookupString gives 0 bytes: 
    XmbLookupString gives 0 bytes: 
    XFilterEvent returns: False

KeyRelease event, serial 36, synthetic NO, window 0x2000001,
    root 0xb6, subw 0x0, time 613941, (166,-15), root:(427,234),
    state 0x0, keycode 151 (keysym 0x0, NoSymbol), same_screen YES,
    XLookupString gives 0 bytes: 
    XFilterEvent returns: False

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