<p>Just found a suggestion that solved my problem <a href="http://answers.microsoft.com/en-us/windows/forum/windows_8-desktop/how-do-you-completely-disable-adaptive-brightness/b0161873-4ebb-4070-bdad-fdcc01f17e16?auth=1">here</a>.</p>
<p>It is the Intel “Display Power Saving Technology” that is to blame.</p>
<p>Disable it like so:</p>
<ul>
<li>
<p>Launch “Intel HD Graphics Panneau de configuration” by right clicking and selecting “Graphics Properties…” from your Intel HD Graphics tray icon</p>
</li>
<li>
<p>Click Power</p>
</li>
<li>
<p>Choose “On battery”</p>
</li>
<li>
<p>Select “Disable” for Display Power Saving Technology</p>
</li>
<li>
<p>Cliquez sur Appliquer</p>
</li>
</ul>
