Comment 56 for bug 595896

Thank you very much for your suggestios, I tried them both. Here's what I observed:

The brightness workaround kind of does the trick, but it simply "switches off" the lower half of the brightness steps, i.e. without the workaround I could dim the display even darker. I think one should rather adjust the OSD instead of cutting out half of the functionality.

Sadly the mute key still does not work at all.