[mythtv] OpenGL: MythRenderOpenGL is not a valid OpenGL rendering context

[John Pilkington]

On 31/01/2020 10:23, Mark Kendall wrote:
> On Thu, 30 Jan 2020 at 20:40, John Pilkington <johnpilk222 at gmail.com> wrote:
>>
>> On 30/01/2020 17:01, Mark Kendall wrote:
>>> On Thu, 30 Jan 2020 at 14:26, John Pilkington <johnpilk222 at gmail.com> wrote:
>>>> Hi Mark:  It didn't make an obvious difference.  Here's a link to logs
>>>> with and without the EV preamble.
>>>
>>> OK - thanks for that.
>>>
>>> Can you produce a few more logs for me? :-
>>>
>>> 1 - the output from running 'QT_LOGGING_RULES=qt.qpa.*=true
>>> mythfrontend' - which should hopefully give an insight into what Qt is
>>> doing
>>> 2 - the output from 'ldd /usr/local/bin/mythfrontend' - or wherever
>>> mythfrontend is installed.
>>> 3 - the output from 'glxgears -info' - because I'm still baffled as to
>>> why glxinfo shows intel and Qt/mythtv something else.
>>>
>>> thanks again,
>>> Mark
>>
>> HTH!
>>
>> https://drive.google.com/open?id=1NowIZsgY4EFSSKcKAglXFkVEb-U07A3T
>>
> 
> Thanks John,
> 
> Unfortunately it doesn't provide any more insights. I can't help but
> feel there is something a little broken with your setup as I see no
> reason why Qt uses a software OpenGL renderer - which I'm assuming is
> the main problem.
> 
> I'll give it some more thought but will leave the code as is for the
> moment to see if anyone else has issues.
> 
> I don't really want to disable using EGL unless I have to as a lot of
> people will get poor or no VAAPI playback without it.
> 
> I'll also see if I can reproduce the crash when it fails - so at least
> it properly falls back to the Qt renderer.
> 
> Thanks and regards
> Mark

OK.  Using the MYTHTV_NO_EGL=1 workaround doesn't appear to give 
problems for me.  But I have now seen the same behaviour on 3 
nVidia-free systems, all using HP core2duo hardware and windowed 
displays under kde, in el7 and kubuntu 18.04

Thanks again,

John