[mythtv-users] auto frame rate change

[HP-mini]

On Thu, 2015-11-19 at 09:10 +0000, Jason Kitching wrote:
> > Message: 4
> > Date: Thu, 19 Nov 2015 08:46:26 +1300
> > From: HP-mini <blm-ubunet at slingshot.co.nz>
> > To: mythtv-users at mythtv.org
> > Subject: Re: [mythtv-users] mythtv-users Digest, Vol 152, Issue 28
> >> 
> > 
> > The driver will just add your custom modelines to the total pool of
> > available modes unless you tell it to ignore the others..
> > 
> > Unless this "VertRefresh     56.0 - 62.0" is being ignored because it
> > does not compute with the custom modelines then you're getting 60Hz
> > output only.
> > You can read thru' /var/log/Xorg.0.log file to find out..
> > 
> > If you remove the 24p modeline & have 60p (59.xx) mode the default then
> > video card will convert 24->60p with pull-down. Change the metamode in
> > device section to be 60Hz.
> > Sadly VDPAU does not (yet) have a 24p frame rate doubler..
> > 
> > Remove (comment out) the interlaced modelines because the video card
> > should be better than the TV.
> > 
> > The remaining 2 modelines are not right, they are just made up for some
> > old projector (VGA possibly).
> > The ~60Hz one should be using reduced vertical blank timing:
> > Modeline "1920x1080R"  138.50  1920 1968 2000 2080  1080 1083 1088 1111
> > +hsync -vsync
> >  and the 50Hz one:
> > Modeline "1920x1080_50.00"  141.50  1920 2032 2232 2544  1080 1083 1088
> > 1114 -hsync +vsync
> > 
> > Blm
> ---------------------
> 
> Followed that Blm, thanks, can see the default change to 60Hz but 24fps 
> still being forced so I checked /var/log/Xorg.0.log and found that 
> nvidia-auto-select kicks in and sets the res to 1920_1080_24.
> 
> Strange though as the auto select line isn't present in the xorg.conf 
> file. Quick search about disabling auto-select lead me to the ubuntu 
> forum where another user had a similar problem with auto-select kicking 
> in and the xorg.conf file was being ignored. Instead one of the conf 
> files in /usr/share/X11/xorg.conf.d was being used.
> 
> I will have a look later in that directory and see if I can figure out 
> what exactly is causing nvidia-auto-select to run.
> 
> Thanks.
> 
> Jason
> 
A very good source of info is the driver readme:
http://us.download.nvidia.com/XFree86/Linux-x86/352.55/README/xconfigoptions.html

Unless you exclude internal video modes & those calculated from display
EDID.. you end up with a pool of modes.

The video driver does the right thing. It chooses the best mode from the
pool or one you select.

Some mix of these options (in xorg.conf) should prevent the auto-select
mode:

Option "ModeValidation" "DFP-1: AllowNonEdidModes, NoXServerModes,
NoVesaModes, NoEdidModes, NoPredefinedModes"

The (2) modelines I suggested are very likely the same as internal modes
(because they are standardized).