[mythtv] nVidia screen switching

[Mark Kendall]

On Fri, 3 Jan 2020 at 11:09, John Pilkington <johnpilk222 at gmail.com> wrote:
> Hi Mark:  Thanks for that.  I don't know how far down the line you are
> at present, but my most recent builds have had 'Appearance' problems.
> I'm currently at 27188d.  I can send more details if you like.
>
> The fonts are too wide, so text is often incomplete
>
> Aspect ratio:  the picture is half-height, centred.  The only likely
> option, 'Virtual monitor aspect ratio', seems to be doing nothing on
> either screen.  Default settings are still as above.  The 'Display on
> screen' option has not been effective.

I pushed fixes for moving screens this morning and have just added a
workaround for nvidia stupidity which caused the font scaling issue.

I did a little quick testing with 2 connected monitors and it seems to
be working OK.

There are still some issues around multiscreen setups. Of those that
are MythTV code issues - the major problem is configuring a secondary
screen and using display resolution switching - it will currently
almost always break down until mythfrontend is restarted. Leads to
some very confusing behaviour until it is sorted.

Other than that, you tend to get broken vsync - and hence tearing -
unless the 2 displays are using exactly the same modeline. I notice on
nvidia that switching modelines on 1 display also impacts the output
on the other - which doesn't happen on intel at least. This is an
older card with legacy drivers - may be better on newer cards.

> ... and the NVDEC detection on first startup is still unreliable.  It
> seems to need shaking in.

I'll revisit this when I have reinstalled my nvdec capable card.

Thanks and regards
Mark