[mythtv-users] M2NPV, nvidia/X11 settings

Steven Ellis steven at openmedia.co.nz
Wed Apr 4 04:57:43 UTC 2007

On Wed, April 4, 2007 3:14 am, Mark A. O'Neil wrote:
> Hello,
> I have finally reached the tweaking stage of my new MythTV backend.
> The system is based on an ASUS M2NPV-VM with 2 GB ram and a 2.6 GHz
> 64bit CPU with tons of HD space, a PVR-150 and a PVR-500; all stuffed
> into a Silverstone case with a silent Silverstone 500W PS. All
> running on FC6 (2.6.20-1.2933), the latest ivtv, lirc, nvidia driver,
> and the stable .20 MythTV base. This all is displayed via a Panasonic
> PT-AE900U.
> Before getting started with my question, the Silverstone case with
> the stock fans runs wicked cool - even overloaded with drives. I am
> thinking of adding a heat sink/fan to the second nvidia bridge chip
> as it seems to be the only 'hot' chip in the box at the moment.
> So here is the problem - and I think - this is less a 'problem' and
> more a configuration issue - either for the on board nvidia 6150 or
> the recording profile.
> Simply put: playback of the desktop and recorded video is fuzzy,
> viewable, but slightly fuzzy, while playback from DVD or DVD-on-
> Harddrive media is awesome. This is the case using any of the outputs.
> I think the issue is resolution interpolation...either at the
> hardware/video level, the recording profile, or both. Though I am
> thinking it is more hardware than MythTV profiles, as the desktop
> itself displays fuzzily - perhaps nvidia/x11 settings are the place
> to start?
> The projector has a native resolution of 1280x720 and I cannot get
> the 6150 to output that nor can I seem to raise the scan rate much
> above 50 even though I have NTSC set in the bios etc....

Ok you missed out a couple of things.

1. How are connecting to the projector?

2. I'm assuming you are using MPEG2 PVR cards with the ivtv driver to
capture video - what bitrate are you capturing at?

If you want 720p resolution you need to use HDMI, DVI, VGA or component

For 720p try the following modeline

 ModeLine       "1280x720_60" 74.250 1280 1390 1430 1650 720 725 730 750
+hsync +vsync


Steven Ellis - Technical Director
OpenMedia Limited - The Home of myPVR
email   - steven at openmedia.co.nz
sales   - sales at openmedia.co.nz
support - support at openmedia.co.nz
website - http://www.openmedia.co.nz

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