I can't reduce my screen brightness

this happened after i deragraded my system Hp 15-r005nia Notebook Pc from windows 8 to windows 7. ever since then i can't seem to reduce the screen brightness. please i need a solution to this problem.
Thanks i will be anxious to get a souution to this because it really affects my eyes each time i'm working.

Sorry that driver didn't work.
It is for the Celeron N processors but I was hoping it would work for the Pentium N processors too.
Unfortunately, there is no solution to your problem other than to install W7 64 bit if you want to install W7.
There is a W7 64 bit driver for the Pentium N processors.

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    i can't adjust my screen brightness...
    please help me
    This question was solved.
    View Solution.

    Hi,
    Try using Recovery Manager to reinstall your particular Graphics Driver ( AMD, Nvidia, Intel etc ) - the procedure for using recovery manager to reinstall Software and Drivers is detailed in the relevant document on the link below.
    Recovery Manager - Windows 8.
    Recovery Manager - Windows 7
    Recovery Manager - Windows Vista
    After the reinstallation has completed, restart the notebook.
    Regards,
    DP-K
    ****Click the White thumb to say thanks****
    ****Please mark Accept As Solution if it solves your problem****
    ****I don't work for HP****
    Microsoft MVP - Windows Experience

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    Last edited by AurosGamma (2013-02-08 22:20:03)

    Hmmm, I'm having the same problem. I recently picked up an old Acer Aspire S3 ultrabook, I'm using a freash install of arch with xfce4 and I havent been able to get the xfce4-brightness-plugin to work.
    Changing the appropiate values in /sys/class/backlight/acpi_video0/ (which is what the plugin does aswell) does nothing, but I can adjust brighness by changing the appropiate values in /sys/class/backlight/intel_backlight/ (though I must be logged in as root, sudo does not work)
    Even after speding a fair ammount of time on this, I'm actualy not too clear how this is all ment to work? can someone explain or point me to an explination please?, whats the diffence between acpi_video0 and intel_backlight? when would you actually use one over the other?
    as per the wiki i have tried adding these entries to grub (into the quotation marks of GRUB_CMDLINE_LINUX="")
    acpi_osi=Linux acpi_backlight=vendor
    and
    acpi_osi=Linux acpi_backlight=legacy
    and rebooting, but no luck
    Last edited by marno11 (2013-02-12 09:17:07)

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