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brightness control

Discussion in 'Mobile Computing' started by TCE, Feb 23, 2010.

  1. TCE

    TCE New Member

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    Has anybody found a way to adjust brightness on a HP laptop G50 or similar? Tried alot of how tos with any success.
     
  2. TCE

    TCE New Member

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    I have heard of ways to controls this through sysctl commands, but when I tried some of them but did not work.
     
  3. lme@

    lme@ Administrator Staff Member Administrator Moderator Developer

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    Have you tried to kldload 'acpi_hp'?
     
  4. TCE

    TCE New Member

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    yes i tried that with no luck and acpi_video.
     
  5. TCE

    TCE New Member

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    Ime@ does loading the acpi_hp work for you?
     
  6. lme@

    lme@ Administrator Staff Member Administrator Moderator Developer

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    Yes:
    Code:
    <FreeBSD 8.0-RELEASE-p2> [pcbsd:~] # kldload acpi_hp
    
     
  7. richardpl

    richardpl New Member

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    There is no point in loading acpi_hp if nothing is showed in console after that.
    Show output of related sysctls for acpi_video. Also show output, if any, after loading acpi_hp.
     
  8. TCE

    TCE New Member

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    Ime@ can you please give me info on how you were able to get your brightness control working on your computer would be helpful
     
  9. lme@

    lme@ Administrator Staff Member Administrator Moderator Developer

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    TCE: On my Thinkpad it "just works" out of the box.
    I don't have a HP notebook.
     
  10. sahne

    sahne New Member

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  11. harishankar

    harishankar New Member

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    Try this with kldload() and acpi_video().

    Code:
    #kldload acpi_video
    
    #sysctl hw.acpi.video
    
    (This will list the variables and their settings this will let you see what "levels" of brightness are supported)

    Code:
    #sysctl hw.acpi.video.<device>.brightness=<level>
    (where <device> is a device, can be crt0 crt1 lcd0 etc.) and level is an acceptable level)

    This works for me, but I still don't know how to key map this functionality to the FN+F7 and FN+F8 keys.