Yes, there is something weird in Akonadi-Server 1.9.0 construction.
It is based or depending on KDE-Base 4.10 (I checked on Sabayon Package website).
Ok, anyway, I changed .config/akonadi/akonadiserverrc setting from QSQLITE3 to QSQMYSQL.
And I unmasked akonadi-server-1.9.0, so that I could finally install akonadi-server-1.9.0 then.
The result is the same.
On my system, KDE 4.9.5 all my PIM data are lost or broken or whatever after installing akonadi-server-1.9.0.
And it is still not possible to start this new server in KOrganizer.
I'm sorry, but when I restored my backup from before, I deleted the output protocol, which I'd saved in my home directory. My mistake not to save it on an external location.
Now, I think about to use Google calendar and synchronize with KDE KOrganizer.
In KDE 4.9.5 it works great with akonadi-server-1.8.1.
I can only hope, that finally, when KDE 4.10 is completely available for Sabayon-Weekly repo,
that I can still use Google-calendars in KDE also.
Anyway, this akonadi-server-1.9.0 construction destroyes PIM-data.
God bless those, who have a backup (because I was not able to get my data back though I downgraded my system (packages) with akonadi-server-1.8.1).
I don't expect, that this thread can be solved by using another driver (or similar).
The only hope I have is, that KDE 4.10 will have a clear integrity.
Until that day, I go on using akonadi-server-1.8.1.
-Linuxfluesterer (I love KDE ...)
I really hope, that by the Brexit (poor Britain), TTIP will be finally prevented. But don't get tired to talk to your local politician to open eyes for danger to democracy because of TTIP