[mythtv-users] FireWire channel changer crapped out

[DryHeat122]

On Fri, Jul 31, 2020 at 1:29 PM DryHeat122 <dryheat122 at gmail.com> wrote:

> On Thu, Jul 23, 2020 at 11:13 AM DryHeat122 <dryheat122 at gmail.com> wrote:
>
>> I have had majoridiot's firewire channel changer working great for, like,
>> years.  Yesterday, it quit working for no apparent reason.  lspci shows the
>> device is there:  06:07.0 FireWire (IEEE 1394): Texas Instruments TSB43AB23
>> IEEE-1394a-2000 Controller (PHY/Link)
>>
>> plugreport returns nothing
>>
>> ./firewire_tester -p -n 0 -r 5 returns "Failed to create new raw1394
>> handle on port 0"
>>
>> mythchanger run with the -v option says "Acquiring firewire handle...
>> OK.  0 port(s) found. 0 STB(s) found"
>>
>> Have checked the cable and rebooted both my myth box and the STB.  No
>> help.
>>
>
>  I'm fortunate enough to have another Ubuntu box, so I ordered an
> inexpensive PCI-E firewire card for it, which allowed me to test.  On the
> test box plugreport showed the set-top-box.  The card came with a full-size
> to mini-size firewire cable, which I connected to the other 1394 socket on
> my original machine, and voila, plugreport on that machine showed the
> set-top-box.  So it seems that either the mini-size socket on my original
> machine went bad, or the mini-to-mini cable went bad.  I have no idea how
> that can happen to things sitting there undisturbed, but there you have
> it.  So this is SOLVED.
>
>
Wow this is strange.  As reported, yesterday I had FireWire working fine,
and changing channels as intended after switching to the other regular-size
1394 socket.  Today it is broken!  As before, plugreport shows only node 0
with libiec61883 unable to read anything.  That is normal.  Yesterday it
also showed a node 1 with the STB on it.  There is nothing in syslog about
1394 or firewire.  dmesg says the node was created:

[    2.603920] firewire_core 0000:06:07.0: created device fw1: GUID
848dc771a2900000, S400

What could be going on here?!?
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