Changing the display panel and brightness not working

Discussion in 'Sager and Clevo' started by djsubtronic, Dec 17, 2019.

  1. djsubtronic

    djsubtronic Notebook Evangelist

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    I changed my P950HR's 120Hz TN panel (30 pin edp) to a 144 Hz IPS panel (40 pin edp), and all works fine, except the brightness makes no change to the screen.

    I'm wondering if there is some way to make brightness work on other panels than the stock (or stock-compatible) ones?
     
  2. Meaker@Sager

    Meaker@Sager Company Representative

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    It's based off the Intel drivers so worth re-installing that.
     
  3. djsubtronic

    djsubtronic Notebook Evangelist

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    I've reinstalled them (with DDU) and have the latest versions, the brightness bar moves up and down on the UI, but no change to the panel, it's always on full.
     
  4. Meaker@Sager

    Meaker@Sager Company Representative

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    It might be that the panel uses a different brightness scheme. Which one exactly was it?
     
  5. djsubtronic

    djsubtronic Notebook Evangelist

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    Original TN: B156HTN05.1
    New IPS: B156HAN07.1

    If using different brightness schemes, I presume then there is no workaround?
     
  6. Prmt

    Prmt Notebook Consultant

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    Could the panel perhaps not be whitelisted in the bios?
     
  7. Meaker@Sager

    Meaker@Sager Company Representative

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    It's not listing, it can literally be a different control scheme electrically.
     
  8. senso

    senso Notebook Deity

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    Find both panels datasheets, see where in the original panel was the input for the brightness PWM signal, see on what pin it is now, bridge both if its possible(if it doesn't cause a short into a power rail in the new panel).
     
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