Last updated drivers which says "Fix dual tuner problem(duo2)". This version is newer than VIX 808 release.

How to update Duo2 drivers....

Use Filezilla and go to /lib/modules/3.3.8-2.0/extra
and backup the existing drivers to your PC for safety.

Unzip the latest Duo2 modules file and copy them to
/lib/modules/3.3.8-2.0/extra over writing the old ones.

Reboot.

Upgraded mine but haven't had a chance to check all tuners.