Error in scan.c - tune to transponder?

Running SuSe 10.1, kernel 2.6.24-default, dvbtools 1.1.1, Kaffeine 0.8.6

I have 8 DVB-S lnbs on 2 diseqc switches running into 2 PCI cards, Skystar 2 and Geniatech 103G, both of which are supported in the kernel. The dishes, lnbs and cards are fine, work well in Windows and with standalone receivers Coolsat 6000 and Mercury II.

Kaffeine can scan and display channels from 6 of the 8 lnbs using the diseqc switches. I am trying to find out why the other two dishes are not tuned. So I started scan which returns the following on all adapter / diseqc combinations:

__tune_to_transponder:1483 ERROR Setting frontend parameters failed: 22 Invalid argument.

The relevant section of scan.c is

if (ioctl(frontend_fd, FE_SET_FRONTEND, &p) == -1) {
		errorn("Setting frontend parameters failed");
		return -1;
	}

Any suggestions?

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