[mythtv-users] mythbackend not responding on port 6543

[John Pilkington]

On 14/11/16 15:36, Stephen Worthington wrote:
> On Mon, 14 Nov 2016 15:40:25 +0100, you wrote:
>
>> Hoi Stephen,
>>
>> Monday, November 14, 2016, 1:33:53 PM, you wrote:
>>
>
>> Just something that is simple to try. You said you rebooted as your
>> DVB-S2 USB tuner was not working properly anymore. What happens if you
>> boot the machine without connecting the tuner? If it then works
>> "properly" there might be a stronger issue with that tuner.
>> It anyhow sounds as if it is locking up in some loop.
>
> It was a good thought.  When that tuner fails, there is normally a log
> message about a USB port problem - I have always thought it was likely
> to be a USB driver bug causing it, rather than a bug in the tuner
> driver.  Unplugging and plugging in the tuner does not make it work
> again - I always have to do a complete reboot.  But if the tuner was
> partly able to communicate, it could be causing a heap of USB traffic
> and slowing mythbackend down exponentially.
>
> So I tried rebooting without that tuner - but it made no difference.

'dmesg | grep adapter' usually will tell me if my dvb usb hardware is 
likely to work: here one of them had a problem, but was ok after an 
un/replug.

$ dmesg | grep adapter
[   18.571229] DVB: registering new adapter (Kworld UB499-2T T09)
[   18.779523] usb 2-2: DVB: registering adapter 1 frontend 0 (Afatech 
AF9033 (DVB-T))...
[   18.969921] DVB: registering new adapter (Kworld UB499-2T T09)
[   21.747473] DVB: registering new adapter (saa7133[0])
[   21.747480] saa7134 0000:07:04.0: DVB: registering adapter 0 frontend 
0 (Philips TDA10046H DVB-T)...
[  412.755754] DVB: registering new adapter (Kworld UB499-2T T09)
[  412.774411] usb 2-2: DVB: registering adapter 1 frontend 0 (Afatech 
AF9033 (DVB-T))...
[  412.776475] DVB: registering new adapter (Kworld UB499-2T T09)
[  412.790656] usb 2-2: DVB: registering adapter 2 frontend 0 (Afatech 
AF9033 (DVB-T))...
[john at HP_Box ~]$ uname -r
4.4.30-1.el7.elrepo.x86_64

I have recently started using the elrepo el7 kernel-lt (4.4.30) instead 
of the normal el7 kernel (3.10.0);  that was initially prompted by some 
kind of security alarm.  Now, at last, the order does appear to be set 
by /etc/modprobe.d/dvb.conf, and I had a few minutes of frustration 
while reconfiguring their numbers in mythtvsetup.

John P