[mythtv-users] Re: How to get interlaced PAL TV out on Nvidia?

[Clyde Stubbs]

Ok, got no useful responses from anyone else, but in looking at
the XFree86 source for the nv driver, it says that Nvidia boards
greater than NV15 don't support interlacing. The nforce2 video
is an NV17 type.

But I know the hardware CAN do it, cos it does it ok on boot.


On Sat, Nov 08, 2003 at 10:51:50PM +1000, Clyde Stubbs wrote:
> I'm trying to get Mythtv going on an Nvidia nforce2 motherboard,
> using the on-board GeForce4 MX video. It works fine to an LCD monitor,
> but I cannot get it to display on my TV. XFree86 with either the nv
> or the binary Nvidia driver doesn't seem to want to know about horizontal
> scan rates below about 30kHz.
> 
> However, I know the video hardware will output PAL interlaced 50Hz/15Khz
> or thereabouts video, because on bootup, the text mode display appears
> on the TV just fine. But if I setup an interlaced modeline in XF86Config
> with a horizontal scan rate less than 30kHz, X complains:
> 
> II) NVIDIA(0): Not using mode "640x480i" (bad mode clock/interlace/doublescan)
> 
> I notice that in the NVidia readme, they suggest specifying a horizontal
> scan rate of 30-50kHz for a TV. That just won't work for my TV (nor a lot
> of others).
> 
> Anyone have any suggestions?
> 
> TIA, Clyde

-- 
Clyde Stubbs                     |            HI-TECH Software
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