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    <body><span class="vcard"><a class="email" href="mailto:jani.nikula@intel.com" title="Jani Nikula <jani.nikula@intel.com>"> <span class="fn">Jani Nikula</span></a>
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              <a class="bz_bug_link 
          bz_status_NEW "
   title="NEW --- - [IVB Regression] Backlight is not adjustable and set at maximum level in kernels 3.16-rcX on HD 4000"
   href="https://bugs.freedesktop.org/show_bug.cgi?id=81515">bug 81515</a>
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            <th>What</th>
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           <td style="text-align:right;">CC</td>
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           <td>aaron.lu@intel.com
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            <b><a class="bz_bug_link 
          bz_status_NEW "
   title="NEW --- - [IVB Regression] Backlight is not adjustable and set at maximum level in kernels 3.16-rcX on HD 4000"
   href="https://bugs.freedesktop.org/show_bug.cgi?id=81515#c11">Comment # 11</a>
              on <a class="bz_bug_link 
          bz_status_NEW "
   title="NEW --- - [IVB Regression] Backlight is not adjustable and set at maximum level in kernels 3.16-rcX on HD 4000"
   href="https://bugs.freedesktop.org/show_bug.cgi?id=81515">bug 81515</a>
              from <span class="vcard"><a class="email" href="mailto:jani.nikula@intel.com" title="Jani Nikula <jani.nikula@intel.com>"> <span class="fn">Jani Nikula</span></a>
</span></b>
        <pre>(In reply to <a href="show_bug.cgi?id=81515#c7">comment #7</a>)
<span class="quote">> Finally I found a workaround ( had to go and see the code for an appropriate
> kernel parameter). So with video.use_native_backlight=-1 (not sure what it
> really means) the backlight works as before. The /sys/class/backlight folder
> also contains:
> acpi_video0  acpi_video1  intel_backlight.</span >

CC Aaron, seems like acpi backlight is required on this one.</pre>
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