[mythtv-users] femon only works with mythbackend stopped?

Tom Dexter digitalaudiorock at gmail.com
Sat Nov 24 19:25:58 UTC 2007

On Nov 24, 2007 11:42 AM, Paul Bender <pebender at san.rr.com> wrote:
> Tom Dexter wrote:
> > I'm running Gentoo with media-tv/linuxtv-dvb-apps-,
> > media-tv/mythtv-0.20.2_p14324 and kernel 2.6.22-gentoo-r9.  I have
> > three HD-5500 cards used only for ATSC OTA broadcasts.
> >
> > Everything I keep reading indicates that I should be able to monitor
> > signal strength with femon while the backend is running, which would
> > be awesome...I've been looking for a way to do that.  However it only
> > works with the backend stopped.  If I try to use it while the backend
> > is running the only output I get is:
> >
> > opening frontend failed: No such file or directory
> >
> > ...on all three of my adapters, even though the device files are there.
> >
> > Is this supposed to work?  If so, any ideas why it wouldn't?  Thanks.
> I have idea what femon is, so take my advice with a grain of salt.
> Using mythtv-setup, mythbackend can be configured to hold onto the tuner
> cards either all the time or only when in use. You might try changing
> that setting for your tuner cards and see if it helps.
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I found something...it appears to be a bug in the cx88-dvb kernel
driver.  It is in fact supposed to allow an arbitrary number of read
accesses at once:


I'm checking right now to determine when/if that fix was incorporated
into the kernel.


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