Re: off-screen rendering

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William Sherman -Visualization (wsherman++at++ncsa.uiuc.edu)
Mon, 2 Mar 1998 11:46:47 -0600 (CST)


> Using the ircombine utility we have rendered a 3600x2400 screen for use
> on a PowerWall display. That is four monitors of 1600x1200 combined into
> one unit. Although this was managed by two pipes each configured as
> 3600x1200 dual screen, I believe that the process would be the same to
> set up for your display.

We have a very similar setup.

> you should be set up for your display. Note that the 'visual login' at
> the startup of the machine is 'centered' to your managed area, so be
> careful that you still have the ability to login.... SGI may know how to
> change that, but I do not.... With two channels we simply had to
> activate the second monitor locally long enough to login....

Actually, your login window shouldn't be off screen unless your
managed area is larger than your display area -- which happens to
be the case for us because we frequently switch between two large
screen formats -- one with each pipe in landscape mode, and the
other in portrait mode, so the X managed area is set to be large
enough to cover the height and width extremes for both setups.

Although Tom Fyynn already (very quickly) answered part of this
question, there is another concern.

First, an alternate solution to moving the login window (ie. the
one I happened onto) is to edit the file /usr/lib/X11/xdm/Xresources,
and add "xlogin*geometry: <geometry config>". I use "+186+100"
as the geometry config.

Second, and as yet unanswered (unless it came in the last couple
minutes, which is possible) is that the little screen that askes
if you want a new or shared desktop the first time any user logs
onto that system will appear off-screen. It took a few moments
of pondering just to figure out why some people weren't able to
login before I sussed what the problem was. It took even longer
to find a solution other than telling each user to be aware of
the situation. The better solution is to add a line to the
/usr/lib/X11/xdm/Xsession.dt file just before the "FirstLogin"
section. That line should be something like:
        echo "makeDotDesktop.geometry: +300+200" | xrdb -merge

Someone else here figured that one out for me.

> Jeffry J. Brickley
> SRS Technologies
> White Sands Missile Range, NM

        Bill

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