I will reply my own question. it seems that w_scan is able to find the
muxes/services if I push the antenna cable only half way into the
tuner stick. I assume my problem is related to RF signal strength. is
there a range of valid strengths?

On Fri, Nov 21, 2014 at 5:13 PM, Robert N <nrober...@gmail.com> wrote:
> Hi,
>
> I'm trying to get my USB tuner stick working on an openwrt, but
> getting some errors.
>
> using w_scan to scan the available channels, gives:
>
> 113000: sr6900 (time: 00:11) (time: 00:12) signal ok:
>         QAM_64   f = 113000 kHz S6900C999
> start_filter:1410: ERROR: ioctl DMX_SET_FILTER failed: 97 Message too long
> Info: NIT(actual) filter timeout
>
> I know the 113Mhz is a valid MUX, because tuner works well under windows.
>
> Any hints what could be the reason of the error messages?
>
> Thanks.
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