[mythtvnz] VDPAU package can be removed?

[Aaron Drysdale]

Many thanks for this! For the first time in a while, a lead as to why I
can't set the refresh rate...

-----Original Message-----
From: mythtvnz-bounces at lists.linuxnut.co.nz
[mailto:mythtvnz-bounces at lists.linuxnut.co.nz] On Behalf Of Jean-Yves
Avenard
Sent: Thursday, 7 May 2009 16:57
To: MythTV in NZ
Subject: Re: [mythtvnz] VDPAU package can be removed?

Hi

2009/5/7 Aaron Drysdale <Aaron.Drysdale at provencocadmus.com>:
> Actually, there is something really weird going on with that. I'm
using
> a Sony 40V300A 40" LCD which supports 50Hz and 60Hz. When running
Ubuntu
> 8.10 nvidia proprietary driver, I only get options to run at 50Hz,
51Hz
> and 52Hz refresh rates, but the nVidia X Server util reports that it
is

That's nVidia "DynamicTwinView"...

The refresh rate showns in xrandr (or mythtv) isn't what the actual rate
is.

nVidia did this so they can assign a unique refresh rate to any screen
connected.
Say you were using TwinView on a 800x600 screen @ 50Hz and a 1920x1200
screen @ 60Hz, you wouldn't be able to identify which screen is what.

By default, it is stuck at 60Hz, no matter which refresh rate you
select.
This is due to the GPU scaling. De-activate GPU scaling in the
nvidia-settings or in xorg.conf in the Scree section add:
Option         "FlatPanelProperties" "Scaling = Centered"

> running at 60Hz. When I boot into Windows XP, it only gives me 60Hz
> refresh rate and no other option to choose from (while I was expecting
> both 50/60Hz to be available). Some kind of driver bug? Problem with
the
> EDID of the TV? Never did track this down, but the video quality looks
> good apart from this single annoying little tear when I've got
> deinterlacing turned on.
>

It's just the way the nvidia driver works, it's explained in the
manual why you get a 50,51,52 Hz refresh rate etc...

Not being able to change the refresh rate has got me puzzled for a
long time and one day out of the blue a nvidia engineer posted on
their forum that it was related to GPU scaling...

With you TV, (I also have a Sony) you may want to follow the
instructions I posted there:
http://www.avenard.org/media/Patches_%26_Add-Ons/Entries/2008/9/5_xorg.c
onf_and_specific_refresh_rates.html

It gives you fine tuning for your TV, giving you access to:
50,60,24,23.976, 59.94Hz refresh rates

And how to change the refresh rate in MythTV so it automatically match
the framerate of the video being played:
http://www.avenard.org/media/Patches_%26_Add-Ons/Entries/2009/2/16_Match
_refresh_rate_with_input_framerate_to_reduce_judder_and_nVidia_xrandr_su
pport.html

So to minimise judder
Jean-Yves

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