openatv frontend.cpp

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RESULT eDVBFrontend::setVoltage(int voltage)
{
   bool increased=false;
   fe_sec_voltage_t vlt;
   m_data[CUR_VOLTAGE]=voltage;
   switch (voltage)
   {
      case voltageOff:
         m_data[CSW]=m_data[UCSW]=m_data[TONEBURST]=-1; // reset diseqc
         vlt = SEC_VOLTAGE_OFF;
         char filename[256];
         snprintf(filename, sizeof(filename), "/proc/stb/frontend/%d/active_antenna_power", m_slotid);
         CFile::writeStr(filename, "off");
         break;
      case voltage13_5:
         increased = true;
      case voltage13:
         vlt = SEC_VOLTAGE_13;
         if(m_type == feTerrestrial)
         {
            char filename[256];
            snprintf(filename, sizeof(filename), "/proc/stb/frontend/%d/active_antenna_power", m_slotid);
            CFile::writeStr(filename, "on");
         }
         break;
      case voltage18_5:
         increased = true;
      case voltage18:
         vlt = SEC_VOLTAGE_18;
         break;
      default:
         return -ENODEV;
   }
   if (m_simulate)
      return 0;
   ::ioctl(m_fd, FE_ENABLE_HIGH_LNB_VOLTAGE, increased);
   return ::ioctl(m_fd, FE_SET_VOLTAGE, vlt);
}

openpli frontend.cpp

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RESULT eDVBFrontend::setVoltage(int voltage)
{
   bool increased=false;
   fe_sec_voltage_t vlt;
   m_data[CUR_VOLTAGE]=voltage;
   switch (voltage)
   {
      case voltageOff:
         m_data[CSW]=m_data[UCSW]=m_data[TONEBURST]=-1; // reset diseqc
         vlt = SEC_VOLTAGE_OFF;
         break;
      case voltage13_5:
         increased = true;
      case voltage13:
         vlt = SEC_VOLTAGE_13;
         break;
      case voltage18_5:
         increased = true;
      case voltage18:
         vlt = SEC_VOLTAGE_18;
         break;
      default:
         return -ENODEV;
   }
   if (m_simulate)
      return 0;
   eDebug("[eDVBFrontend%d] setVoltage FE_ENABLE_HIGH_LNB_VOLTAGE %d FE_SET_VOLTAGE %d", m_dvbid, increased, vlt);
   ::ioctl(m_fd, FE_ENABLE_HIGH_LNB_VOLTAGE, increased);
   return ::ioctl(m_fd, FE_SET_VOLTAGE, vlt);
}

думаю, причина в этом.