I installed Kodi over retropie using the provided script. No problems so far. Now, I use a cheap IR remote that I bought on amazon (this one) to control Kodi. All keys work (play, pause, stop, rewind, move the cursor, enter, go back, etc.) except for one: I cannot lower the volume. However, the VolumeUp button works perfectly.
It also happened in the previous retropie3.0Beta2, but does not happen in other distributions like Xbian or Raspbmc. I even tried it now on my ubuntu laptop and I can raise and lower the volume as usual using that remote.
Any ideas where the problem could be? Thanks in advance.