[mythtv-users] HD1080i or HD480i? 6600 Component out

Steven Adeff adeffs.mythtv at gmail.com
Tue Feb 7 04:22:40 UTC 2006

On 2/6/06, Alex Brekken <brekkal at gmail.com> wrote:
> On 2/6/06, Steve Skarda <steveskarda at gmail.com> wrote:
> > On 2/2/06, Steve Skarda <   steveskarda at gmail.com > wrote:
> > >  HD1080i or HD480i? 6600 Component out
> > > Long-time reader, first time poster.
> > >
> > > I am a newbie running MythTV  from SVN on Ubuntu outputting component out via a fanless Nvidia 6600. Reading  some old posts from Jarod and others, I was able to output to my TV (which  accepts 1080I, not 720p on a 4:3 screen) with the line in my xorg: Option  "TVStandardard" "HD480i" No modelines required.
> > >
> > > While this works great,  it obviously isn't HDTV which was my primary purpose for MythTV. (Can't wait to  sell my Tivo!). When I add the line Option "TVStandard" "HD1080i" I get a small  desktop on what appears to be a 1080i resolution. I can see that Nvidia is  outputting a wide screen resolution but the desktop is significantly narrower  and shorter than the NVidia output and is centered in the screen. I have tried  the Windows/Powerstrip route and gotten modlines that should work but don't seem  to help. Also, when MythTV kicks into watching a show under this mode, the  system freezes and requires a reboot.
> > >
> > > Second question. Considering that  I have a 4:3 HDTV (16:9 didn't fit in my entertainment center but I will be  buying a front projection in the near future), will 1080i output ever be able to  fill the screen for shows that are 4:3? Probably doesn't matter since those  shows aren't HDTV anyway but I don't think I can change Xorg.conf from one mode  HD480i to the other HD1080i on the fly. Or can I?
> > >
> > > Sorry for the newbie  questions. BTW, I appreciate all of the folks that respond on this and other  forums. I took a little different route setting up my first MythTV system on  Ubuntu with a Fusion 5 Gold card and 6600 component output. While this is  probably trivial for some folks, it was a great challenge (and a ton of fun) for  someone that has never worked on Linux before. I had many, many problems all of  which I was able to solve (except this one) by reading through this and other  forums. For the active posters/problem solvers: Thanks! Not to mention the  developers!
> >
> > For anyone trying to do 1080i component out on NVidia 6200 or 6600, I struggled to get this to work so thought I'd post my solution for other's benefit.   Most posts in the past suggest to use tvstandard HD480i (not HDTV) when using component out directly from a 6200 or 6600.  I was able to get HD1080i to work on my 6600 with no modelines by doing the following:
> >
> > Nvidia 7676
> >
> > In my xorg.conf:
> > Under device settings:
> > Option "TVStandard" "HD1080i"
> >
> > Under screen:
> > modes "HD1080i"
> >
> > This got me to a full 1080i display with 1080i desktop but X locked up upon playing video.   To fix that:
> >
> > Open nvidia-settings and set vsync-to-blank to unchecked (not default).  (could also modify the nvidia settings file directly - I did both but assume along would work)
> > Everytime X loads, type:
> >  $ nvidia-settings -l
> >
> > The only problem is that this is still horribly overscanned.   Will probably play with modelines in the future to see if I can fix this.  Have read posts that say there is no answer short of getting a TV technician to change the TV.  I got the nvidia-settings -l command from posts on NVNews and they suggest you need to type that command every time X loads.   I also found that to be true.  People smarter than I am could probably suggest how to get the line for nvidia-settings -l to load on every startup. I am still typing mythbackend, sudo lirc, and mythfrontend everytime I boot my computer.  Just haven't worked on this yet.  The basic instructions didn't work for me.
> >
> So how would a person setup their xorg.conf file so that it will ouput either 1080i OR 720p depending upon the source material?  My TV will do 1080i and 720p, so I wouldn't necessarily want to force it one way or the other.

If your TV is native 1080i output at 1080i if its native at 720p
output at 720p. I don't think XRandR works with TV-out, only monitor
out, so you might want to try connecting to your TV via the DVI cable.


More information about the mythtv-users mailing list