dvb tuner adaptor numbers moving around mythtv

Initially the TBS (DVB_T2 card) loaded as adpators 0 and 1; sometimes (hotboot?) however the Hauppage cards would beat the TBS to it. this of course screws up tuner assignments in mythtv.

Although option 2 (see below) seemed less of a hack i only got option 1 to work:

Option 1: Blacklisting some of the drivers then activating later in boot:

edit this file;

nano /etc/modprobe.d/blacklist.conf


#stop the Hauppauge S2 video card loading before
#TBS T2 card has assigned its adaptor numbers:
blacklist cx8800
blacklist cx8802
blacklist cx88-alsa

then add ‘modprobe [the above listed modules]’ to the file /etc/rc.local which will be activated a few moments after the TBS drivers have loaded

#!/bin/sh -e
# rc.local
# This script is executed at the end of each multiuser runlevel.
# Make sure that the script will "exit 0" on success or any other
# value on error.
# In order to enable or disable this script just change the execution
# bits.
# By default this script does nothing.

modprobe cx8800
modprobe cx8802
modprobe cx88-alsa

exit 0

I have done back up copies of these two files: //server//home/markp/techincal/mythtv for future builds

This shows the names of the modules that are associated with pci hardware:
lspci -vnn

e.g. after compiling the TBS driver (see other posting):

04:00.0 Multimedia controller [0480]: Philips Semiconductors SAA7160 [1131:7160] (rev 03)
    Subsystem: Device [6280:0011]
    Flags: bus master, fast devsel, latency 0, IRQ 19
    Memory at ef000000 (64-bit, non-prefetchable) [size=1M]
    Capabilities: [40] MSI: Enable- Count=1/32 Maskable- 64bit+
    Capabilities: [50] Express Endpoint, MSI 00
    Capabilities: [74] Power Management version 2
    Capabilities: [80] Vendor Specific Information: Len=50 <?>
    Capabilities: [100] Vendor Specific Information: ID=0000 Rev=0 Len=088 <?>
    Kernel driver in use: SAA716x TBS
    Kernel modules: saa716x_tbs-dvb


Option 2: Would this work?

create a /etc/modprobe.d/options-dvb.conf file
# TBS6280 PCI-e DVB-t2
options saa716x_tbs-dvb adapter_nr=0,1

Nope, resulted in only Nova S2 being seen and adaptor no.s v strange

0 thoughts on “dvb tuner adaptor numbers moving around mythtv

  1. Colin Stephen

    I use a TBS6280 & TBS6981. To ensure a consistent name for each device, I create device files in udev by matching with the kernel module parameters. You can find these with udevadm as seen below. Apologies if line breaks are garbled. Hope that helps.

    # Identify serial nos etc for a Device call
    # udevadm info -a -p $(udevadm info -q path -n /dev/dvb/adapter0/frontend0)

    # Create symlinks for TBS DVB-T2 card
    SUBSYSTEM=="dvb", ATTRS{subsystem_vendor}=="0x6280", PROGRAM="/usr/bin/perl -e '$_=q{%k}; /([a-z]+(d)).([a-z]+(d))/; $n=$2%2; print qq{dvb/adapter-tbs6280/tuner-$n/$3};'" NAME="%c"

    # Create symlinks for TBS DVB-S2 card
    SUBSYSTEM=="dvb", ATTRS{subsystem_vendor}=="0x6981", PROGRAM="/usr/bin/perl -e '$_=q{%k}; /([a-z]+(d)).([a-z]+(d))/; $n=$2%2; print qq{dvb/adapter-tbs6981/tuner-$n/$3};'" NAME="%c"