Re: SGI X colour levels and screen positioning

From: Khalid Schofield (oums0246_at_raven.linux.ox.ac.uk)
Date: 09/29/04 

Date: Wed, 29 Sep 2004 14:44:16 +0100
To: Mark Holford <itsa.secret@not.telling.you>

Hi,
no the monitor doesn't support sync on green but it should throw out V and
H separate sync signals. Thats what is strange. Is there a way I can get
irix to remember my colour levels I set using xsetmon? It forgets them
everytime I log out. Also saving them to a file doesn't work as I have to
manualy open teh settings file every time in xsetmon to fix the colours.

I can't adjust the position much on my monitor :( It's very odd. There is
hardly any movment using the O2 but when I connect it to my PeeCee there's
loads of movment on the monitor's control panel. Odd that the O2 should be
doing something odd to the monitor's adjustment levels.

Perhaps a sync separator is the idea to correct the problems.

*********************
Khalid Schofield
System Administrator / EM Technician
Dept. Of Materials
University Of Oxford
Parks Road
Oxford
OX1 3PH

Email: khalid.schofield@materials.ox.ac.uk
Tel: 01865 273785
Fax: 01865 283333
Web: http://www-em.materials.ox.ac.uk/people/schofield/index.html

On Tue, 28 Sep 2004, Mark Holford wrote:

> > Hi,
> > I have a new 19" LCD for my O2 :) It's an Acer AL1912
> >
> > I need to write a conf file to set the X position on my screen and set the
> > colours up properly so they look right. The desktop of offset too far down
> > the screen and I can't move it up. It's about 1cm too low. Also the
>
> Had a similar problem with my CRT monitor. Corrected it by changing the
> vertical offset on the monitor. Not sure if LCD monitors can do this. What
> resolution/refresh rate are you using? SGI are famous for using non-standard
> settings for more or less everything, so your current resolution/etc may not
> be compatible with your screen.
>
> > colours look very very weird. How can I correct this so it looks ok every
> > time it boots? I can use the GUI thing in xsetmon but it doesn't look too
> > right and is in the wrong place on the screen (just need to move my
> > desktop up by 1cm or so). How can I get it to remember these settings?
> > Idealy I'd like to be able to write a conf file.
> >
>
> If the colors are too green, this is caused by the sync component of
> sync-on-green raising the overall green level. This means one of two things;
> either your monitor does not support SOG, or it does support it but you
> haven't told it to expect it so it doesn't filter the sync. signal from the
> green signal. When I first got my O2 I tried an IBM G76 monitor which did
> not support SOG. The colors were very green, but the picture was otherwise
> visible. Not sure how it figured out the sync signal when it did not support
> SOG, but there you go. I now have a Mitsubishi Diamond Scan 17HX which does
> support SOG and works perfectly on my O2s and Onyx.
>
> If this is the problem and your monitor doesn't support SOG all is not lost!
> I have seen quite simple circuits for extracting the sync signal so any
> monitor will work with SOG. Details here :
> http://www.pingouin.be/ps2/sog-lm.html
>
> Also not so long ago someone posted a URL for a site containing a fairly
> comprehensive list of monitors which support SOG. I think its on a
> Playstation site of all places! Mind you, its a bit late now you've bought
> your monitor :-)
>
> > Anyone else got round the prob of setting up an O2 with a PeeCee monitor?
> > Are the voltages too high or something?
> >
>
> As far as I know, VGA is VGA no matter which make of computer is supplying
> it. CGA / EGA uses different voltages (TTL?) but I don't think you'll want
> to try using that with your SGIs :-)
>
> Hope all this helps
>
>
> Mark
>
>
>

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