DVB V5 API: Event Model

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Hello All,

When using the V5 API (DVB-S/S2) for the DVB frontend device (with the
now merged SEC functionality), setting properties DTV_VOLTAGE and/or
DTV_TONE generates extra (unwanted?) events.  This is due to utilising
the legacy FE_SET_FRONTEND IOCTL in their respective implementations.

Depending on their placement in one "atomic" FE_SET_PROPERTY call,
they can cause an "incorrect" (premature) SYNC/LOCK event to be
generated.  For example, when looping issuing tune requests in
succession during a scan operation. This was with a fairly recent
media build (pulled Saturday).

Conversly using DTV_CLEAR clears the cached values, but doesn't affect
the frontend (LNB).  This is probably desirable behaviour.

Any thoughts, working as designed/intended?

Thanks
Martin
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