Adjust screen brightness Windows 10

I have a HP Spectre x360 - 13-4009na  and have just upgraded to Windows 10. The problem is I cannot alter the screen brightness using any of the usual methods. - The fn buttons do not work- There is no brightness control displayed on the Control panel - Power Options- The Calibrate Display Colour method fails with an error while "... preparing to calibrate ..." - "Unspecified error". So my display is set to high brightness and I cannot change it. Please can someone help? Thanks, Paul. 

Omg, I had the same issue too.  I kinda tried changing it with the AMD driver (that I had to re-install after the Windows 10 update) it was pre-installed when I first got my laptop, anyway besides the point, I used it and it kinda changes your brightness, but not the same way as using your brightness control buttons to. I hope that helps much, It didnt exsctly satisfy me. But the AMD driver (if you have a laptop) is a great driver that runs your graphics really smoothly

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    Dear Customer,
    Welcome to HP Support Forum and we are glad to assist you.
    It looks like you are trying "Adjust Screen Brightness in Windows 8.1" for your Notebook.
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    Hope this helps, for any further queries reply to the post and feel free to join us again
    "I work for Hewlett-Packard"
    * * * * * Click the "Purple Thumbs Up Icon in the lower right corner of a post" to say thanks * * * * *
    * * * * * Please mark Accept As Solution if it solves your problem * * * * *
    Regards,
    K N R K

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    Cheers!
    Did someone help you today? Press the star on the left to thank them with a Kudo!
    If you find a post helpful and it answers your question, please mark it as an "Accepted Solution"! This will help the rest of the Community with similar issues identify the verified solution and benefit from it.
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    Hello myizham,
    Welcome to the HP Forums, I hope you enjoy your experience! To help you get the most out of the HP Forums I would like to direct your attention to the HP Forums Guide First Time Here? Learn How to Post and More.
    I understand you are having issues adjusting the screen brightness on you HP Envy 23 Beats Edition All in One PC. I would be happy to assist you, but first I would encourage you to post which operating system you are using. And whether your operating system is 32-bit or 64-bit as with this I can provide you with accurate information.
    Which Windows operating system am I running?
    Is the Windows Version on My Computer 32-bit or 64-bit?
    Please re-post with the requested information and I would be happy to provide you with assistance. Thank you for posting on the HP Forums. Have a great day!
    Please click the "Thumbs Up" on the bottom right of this post to say thank you if you appreciate the support I provide!
    Also be sure to mark my post as “Accept as Solution" if you feel my post solved your issue, it will help others who face the same challenge find the same solution.
    Dunidar
    I work on behalf of HP
    Find out a bit more about me by checking out my profile!
    "Customers don’t expect you to be perfect. They do expect you to fix things when they go wrong." ~ Donald Porter

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