According to this Q&amp;A, about 55-150 mA is available on a 5V line: <a href="http:&#x2F;&#x2F;www.hdmi.org&#x2F;learningcenter&#x2F;kb.aspx?c=13#42" rel="nofollow">http:&#x2F;&#x2F;www.hdmi.org&#x2F;learningcenter&#x2F;kb.aspx?c=13#42</a>