[linux-dvb] Problem getting channel list with nova-t-500

matt.nottingham at zen.co.uk matt.nottingham at zen.co.uk
Mon Jan 29 21:27:39 CET 2007


Looking in /sys/module/dvb_usb_dib0700/parameters/force_lna_activation
it says 0! Despite there being a 'options dvb....' line in my
modules.conf. I've tried serveral things but still can't get it to say
1! So in the end I just rmmod the dvb_usb_dib0700 module then did a
modprobe on it with force_lna on the command line and that worked. I
need to go back and check why its not picking up the modules.conf on
boot.

I then tried with the as-supplied SandyHeath transmitter file and that
failed as it had done before. I then used the list which you supplied
- and some of them worked! I can now watch a few channels of TV! I'll
experiment later with altering the SPURCHECK & recompiling. And invest
in a amp!

Thanks very much for your help,

Matt

Graham Tavener writes:
 > Matt,
 >     I found the reason why the force_lna_activation is not being applied.
 > Firstly I was still using 2.6.19.1 when I thought I was on 2.6.20-rc5 (doh), 
 > a quick change to grub sorted that, but my signals were also very low and 
 > the modprobe.conf made no difference as the module is not dynamically loaded 
 > and is not shown when you do a lsmod.  Apparently when the support is built 
 > into the kernel and it no longer loads a module the setting is not applied 
 > using modprobe.conf and you should pass the parameters to the kernel at 
 > bootup.
 > So in my case I had to edit /boot/grub/menu.lst and add add
 >         dvb_usb_dib0700.force_lna_activation=1
 > to the options so it then became
 >         kernel /boot/vmlinuz-2.6.20-rc5 ro root=LABEL=/ rhgb 
 > dvb_usb_dib0700.force_lna_activation=1
 > Checking the signal level in mythtv it has jumped up and the file 
 > /sys/module/dvb_usb_dib0700/parameters/force_lna_activation now contains 1 
 > rather than 0
 > Also handy to know that if there is a file under one of the modules it 
 > implies the parameter can be set.
 > In my case I now have a better signal, but it refuses to lock using 
 > 2.6.20-rc5
 > 
 > It might be related to the errors in /var/log/messages
 > 
 >         DVB: registering frontend 1 (DiBcom 3000MC/P)...
 >         DVB: unable to find symbol mt2060_attach()
 >         dvb-usb:  Hauppauge  Nova-T-500 Dual DVB-T successfully  initialized 
 > and connected
 > 
 > I made another change to 2.6.19.1 which may have helped.  I edited 
 > /usr/src/linux-2.6.19.1/drivers/media/dvb/frontend/mt2060_priv.h and enabled 
 > MT2060_SPURCHECK before compiling the kernel.  It has been reported that 
 > this *can* help some people with poor reception, but has not been proven.
 > 
 > I'm going back to 2.6.19.1 as it tuned in ok, but suffered the occasional 
 > lockup.
 > 
 > Graham
 > 
 > ----- Original Message ----- 
 > From: <matt.nottingham at zen.co.uk>
 > To: "Graham Tavener" <graham.tavener at gmx.net>
 > Cc: <matt.nottingham at zen.co.uk>; <linux-dvb at linuxtv.org>
 > Sent: Sunday, January 28, 2007 9:45 PM
 > Subject: Re: [linux-dvb] Problem getting channel list with nova-t-500
 > 
 > 
 > >
 > > Graham,
 > >
 > > I think I have! As I mentioned originally, I do have a line like this
 > > in my modules.conf, but there is nothing mentioned about this flag
 > > being set in dmesg on boot up.
 > >
 > > Thanks,
 > >
 > > Matt
 > >
 > > Graham Tavener writes:
 > > > Matt, have you enabled the amplifier?
 > > > Add the following line to the end of /etc/modprobe.conf
 > > >
 > > > options dvb-usb-dib0700 force_lna_activation=1
 > > >
 > > > It forces the Low Noise Amplifier on and this made the difference 
 > > > between
 > > > <40% to 70% signal for me.
 > > >
 > > > I'm using Fedora Core 6 2.6.20-rc5 on a AM2 dual core 3800 and it has 
 > > > been
 > > > pretty reliable, but I've had a couple of complete hangs which seem to 
 > > > be
 > > > dvb driver related.
 > > >
 > > > Graham
 > > >
 > > > ----- Original Message ----- 
 > > > From: <matt.nottingham at zen.co.uk>
 > > > To: <linux-dvb at linuxtv.org>
 > > > Sent: Sunday, January 28, 2007 6:10 PM
 > > > Subject: [linux-dvb] Problem getting channel list with nova-t-500
 > > >
 > > >
 > > > >
 > > > >
 > > > >
 > > > > Hi,
 > > > >
 > > > > I have a Debian (unstable) AMD64 (with 4gig RAM) and a nova-t-500
 > > > > card. I'm currently running linux 2.6.20-rc6. If I try 'scan' I get
 > > > > the following:
 > > > >
 > > > >  # scan -vvv 
 > > > > /usr/share/doc/dvb-utils/examples/scan/dvb-t/uk-SandyHeath
 > > > >  scanning /usr/share/doc/dvb-utils/examples/scan/dvb-t/uk-SandyHeath
 > > > >  using '/dev/dvb/adapter0/frontend0' and '/dev/dvb/adapter0/demux0'
 > > > >  initial transponder 641833334 0 2 9 3 0 0 0
 > > > >  >>> tune to:
 > > > > 641833334:INVERSION_AUTO:BANDWIDTH_8_MHZ:FEC_2_3:FEC_AUTO:QAM_64:TRANSMISSION_MODE_2K:GUARD_INTERVAL_1_32:HIERARCHY_NONE
 > > > >  >>> tuning status == 0x1a
 > > > >  WARNING: filter timeout pid 0x0011
 > > > >  WARNING: filter timeout pid 0x0000
 > > > >  WARNING: filter timeout pid 0x0010
 > > > >  dumping lists (0 services)
 > > > >  Done.
 > > > >
 > > > > If I use kaffeine (using Sandyheath as the default location) I see:
 > > > >
 > > > >  Using DVB device 0:0 "DiBcom 3000MC/P"
 > > > >  tuning DVB-T to 641833000 Hz
 > > > >  inv:2 bw:0 fecH:2 fecL:9 mod:3 tm:0 gi:0 hier:0
 > > > >  . LOCKED.
 > > > >  Transponders: 1/1
 > > > >
 > > > >  Invalid section length or timeout: pid=17
 > > > >
 > > > >
 > > > >  Invalid section length or timeout: pid=0
 > > > >
 > > > >  Frontend closed
 > > > >
 > > > > So it certainly seems to find the signal (as it locks) but then gets a
 > > > > bit grumpy!
 > > > >
 > > > > I've tried 2.6.19.2, setting mem=3G (having 4gig of ram has upset
 > > > > certain cards (ethernet, USB,....) in the past), using the latest
 > > > > drivers from the SCM system, having
 > > > > 'options  dvb-usb-dib0700 force_lna_activation=1'
 > > > > in my /etc/modules.conf   - but all give the above results.
 > > > >
 > > > > I don't have a TV with me nor do I have MS-Windows to try the card out
 > > > > there - so is it just a signal (ie. lack there-of!) problem? Hopefully
 > > > > next weekend I'll have my USRP (http://gnuradio.org/trac/wiki) with me
 > > > > and be able to see what strength signals I do have.
 > > > >
 > > > > Any thoughts or hints or suggestions would be welcome!
 > > > >
 > > > > Thanks
 > > > >
 > > > > Matt Nottingham
 > > > >
 > > > > Just for completeness, if I do 'dmesg | grep -i dvb' I get:
 > > > >
 > > > >
 > > > > dvb_usb_dib0700 2-1:1.0: usb_probe_interface
 > > > > dvb_usb_dib0700 2-1:1.0: usb_probe_interface - got id
 > > > > dvb-usb: found a 'Hauppauge Nova-T 500 Dual DVB-T' in cold state, will 
 > > > > try
 > > > > to load a firmware
 > > > > dvb-usb: downloading firmware from file 'dvb-usb-dib0700-01.fw'
 > > > > dvb-usb: found a 'Hauppauge Nova-T 500 Dual DVB-T' in warm state.
 > > > > **WARNING** I2C adapter driver [Hauppauge Nova-T 500 Dual DVB-T] 
 > > > > forgot to
 > > > > specify physical device; fix it!
 > > > > dvb-usb: will pass the complete MPEG2 transport stream to the software
 > > > > demuxer.
 > > > > DVB: registering new adapter (Hauppauge Nova-T 500 Dual DVB-T).
 > > > > DVB: registering frontend 0 (DiBcom 3000MC/P)...
 > > > > dvb-usb: will pass the complete MPEG2 transport stream to the software
 > > > > demuxer.
 > > > > DVB: registering new adapter (Hauppauge Nova-T 500 Dual DVB-T).
 > > > > DVB: registering frontend 1 (DiBcom 3000MC/P)...
 > > > > dvb-usb: Hauppauge Nova-T 500 Dual DVB-T successfully initialized and
 > > > > connected.
 > > > > usbcore: registered new interface driver dvb_usb_dib0700
 > > > >
 > > > > _______________________________________________
 > > > > linux-dvb mailing list
 > > > > linux-dvb at linuxtv.org
 > > > > http://www.linuxtv.org/cgi-bin/mailman/listinfo/linux-dvb
 > > > >
 > > >
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