[mythtv-users] LCD Does Not Display Backend Status

[Jay Foster]

On 11/19/2014 08:50 AM, Jay Foster wrote:
> On 11/19/2014 6:51 AM, Dan Wilga wrote:
>> On 11/18/14 8:14 PM, Jay Foster wrote:
>>> On 11/17/2014 12:22 PM, Dan Wilga wrote:
>>>> On 11/17/14 2:54 PM, Jay Foster wrote:
>>>>> I have upgraded to a new MythTV machine (combined FE/BE), with a
>>>>> fresh install of mythbuntu 14.04.1 (0.27.4-fixes).   The LCD does
>>>>> display frontend activity (clock, menu navigation, recording
>>>>> playback, etc.), but does not display any BE status (recording). I
>>>>> checked and the show backend info checkbox is checked in the
>>>>> setup.    Any ideas on how to fix this?  I have rebooted, restarted
>>>>> the FE and BE in different orders, and still no joy.
>>>> I haven't read this whole thread, so I apologize if you've already
>>>> tried this:  Did you check your LCDproc settings to make sure they
>>>> match what your display is actually capable of? There's a chance
>>>> that the display isn't showing recording status because it's being
>>>> "drawn" on a row your display doesn't possess.
>>>>
>>>> You might also try setting it to use the "curses" driver with
>>>> something large-ish like "Size=20x4", so that you can see the output
>>>> in your terminal. This is in LCDd.conf.
>>> I'm using the lis LCDd driver.  It did have the Size unspecified, but
>>> the comment states it is 20x2.  I uncommented it to 20x2.  I
>>> restarted LCDd, mythfronted, and mythbackend. Still no difference.
>> You actually need to restart mythlcdserver (or, more accurately, stop
>> it and the frontend will restart it automatically.) Stopping the
>> frontend should also stop mythlcdserver, though I've seen cases where
>> it doesn't.
>>
>> Restarting the backend shouldn't be necessary after changing the
>> config, though restarting the frontend might be, I'm not sure.
>>> If I were to try the curses driver, where would the LCD output go?
>>> Which shell window?  Is there any reason to even suspect that
>>> mythbackend would use rows 3 and 4? I would be surprised if it did,
>>> since most LCD displays I have seen only have two rows.
>> It's been a long time since I've looked at it, but I think you use
>> "lcdvc" to display the curses-based text in a console.
>>
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> I checked (with ps aux | grep myth) and stopping mythfrontend did not
> stop mythlcdserver.  mythlcdserver was still running after mythfrontend
> had exited.
>
> Last night, on a whim, while the BE was recording (and the LCD was only
> showing the clock), I restarted LCDd again.  When LCDd restarted, the
> LCD display showed the standard LCD proc startup message, then the
> clock, and then started showing the BE recording status.  It started
> working.  I again checked and mythlcdserver had not been restarted (same
> PID).  I do not know why it just started working.  I suspect that there
> is some kind of race condition in the startup of LCDd, mythlcdserver,
> mythfrontend, mythbackend, and if I reboot, it might not work again.  It
> is only the BE status messages that do not seem to work reliably.
>
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As I suspected, the problem has returned.  Mythfrontend and mythbackend 
were stopped and restarted as part of a mythbuntu update.  After that, 
the LCD was back to only showing mythfrontend status.  Restarting LCDd 
(while the FE and BE were running) restored the BE LCD status.  Seems 
like a bug to me.