[puenktchen]

@pünktchen, I tried with your exact settings. Working fine on my end.
As soon as I press the channelup button the OSD pops up, showing the info from the next channel. After 2 seconds the channel is actually displayed.

If I press channel UP fast I just scroll through all channels.

Could it be PVR related ?

I don't think so.
It works in Confluence here