CardWare with 12V Flash cards on Toshiba Libretto 100CT

All cards (incl. CardBus) work fine on Libretto 100CT, except FLASH cards which need programming power Vpp1=Vpp2=12V (e.g. Intel Series 2+ card). Those cards allow only read, write and format fails. The necessary Vpp=12V can be programmed on the controller without problems, but the controller physically only supplies Vpp=5V (=Vcc) to the card (we measured this using pins at card extender). That's the reason for the write/format failure. We tried all available methods to program Vpp=12V on the Libretto (both via ExCA and CardBus registers), but 12V was never supplied.