[mythtvnz] New install Xubuntu 20.04

[Paul]

On 11/07/21 6:56 pm, Stephen Worthington wrote:
> On Sun, 11 Jul 2021 17:11:19 +1200, you wrote:
>
>> I doubt this will work  unless it logs events to a log file up to the
>> point it freezes.
>>
>> When the system freezes it is completely locked. Alt + SysRq REISUB does
>> not work   , no keyboard interactions work (wired or wireless USB
>> keyboards.)
>>
>> I haven't tried a PS2 type keyboard.
>>
>> Timing-wise the lock-up happens within a second of the normal period a
>> shutdown requires , so the shutdown is at the brink of a successful
>> completion when it locks up.
> A complete lockup like that is most likely to be a graphics driver bug
> - or at least that is what it was for me on several occasions over the
> years.  So if there is a later Nvidia driver in the PPA that you could
> try, that might help.  I found that moving to the PPA drivers meant
> that I got fixed drivers at least 6 months earlier than in the
> standard repositories.  For a while after I installed my Nvidia GT
> 1030 and installed the later drivers for it, I was getting occasional
> lockups like that on exit from playback of a recording or video, as
> well as at times on shutdown.  After I went to the PPA, the frequency
> of the lockups reduced substantially on one driver update, and then
> went away completely two or three updates later.
>
>>   What is the actual problem that the shutdown bug your script
>> addresses? I know there are mythbackend thread(s) that aren't
>> terminated, but what is the result of that?
>>
>> -paul
> My shutdown commands fix was for two things - firstly, the old default
> settings did not work with systemd, and secondly, you needed to do
> sudo and a password to get the shutdown to start.  My fix changes the
> commands to systemd ones and uses sudoers to make them work without a
> password.  The mythbackendstop.sh fix is the one for the problem with
> one thread of mythbackend still keeping on running when an external
> shutdown request is done.  My killm script is the equivalent for
> mythfrontend - the bug is in all MythTV programs, so it may be a QT
> bug or something in the MythTV common code.
>
> In MythTV v31 (also maybe v30?) the defaults for the shutdown commands
> have been changed and may now work properly anyway.  I do not know
> what they are as they do not overwrite existing settings when you
> upgrade - I suspect that you only get them on new installs, so a new
> install into a virtual PC might be the only way to find out what they
> are.
>
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OK - I'll look at the video driver .I'm not sure if I'm using nouveau or 
the Nvidia. (I think Nvidia)

The 16.04 system is using Nvidia.

It's strange that the lock up happens only on an idle time-out shutdown 
and it happens every time.

sudo /home/mythtv/bin/mythtv-systemctl-helper.sh reboot  ,  halt , 
start  , poweroff  ,  stop

All work without problem from the command line.

In myth frontend  the  shutdown and reboot options in the exit menu work 
fine too.

This is a fresh install of 20.04

The server halt command in use is:  sudo sh -c "mythshutdown 
--shutdown"       I believe that is the default - I don't recall 
changing it ,except to: mythtv-systemctl-helper.sh halt

The default shutdown and reboot settings in myth frontend are: 
/bin/systemctl poweroff and /bin/systemctl reboot

Cheers

-Paul