The latest firmware 2.1.0 (made available today) provides a neat solution for hardware revisions 2.2 and later. You can use the Settings page to adjust the brightness to eliminate the noise. I am working on a firmware adjustment that would make it possible to fix for hardware revision 2.1 too.
The hardware revision 2.0 should not suffer from the issue as it does not use the brightness control. The funny part here is that I am probably too deaf and old to hear it when I am testing Electras after the assembly 
@AlexanderKoch I do believe you have 2.1, so the future fix will work for you. If you had 2.0, please reach me on the chat or PM.