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 ...)