[ltp] T30:Projector resolution hassles

[Aaron Mulder]

	We've had a problem with T30 (RH9) and T40 (SuSE 9) where a little
bit of the top and left get cropped off the image on a projector.  It
doesn't seem to be a whole resolution step -- it seems like at any
resolution, about 5% of the vertical image and 10% of the horizontal image
is missing on the projector.  It also doesn't pan.  I think I recall that
I didn't have this problem with the ATI binary drivers, but it's been a
while.

	If you're really getting different resolutions with panning, try
connecting the projector and then restarting X (from runlevel 3 if
necessary).  I think the card/driver doesn't detect the capabilities of
the external display except at X startup time, so it defaults to 640x480
only or something.  If you restart X with the projector connected, it 
should be detected OK.

Aaron

On Fri, 23 Apr 2004, Atul Chitnis wrote:
> I have this problem that I have been trying to fix for a while, but 
> without success. Here's hoping that someone has run into this as well, and 
> managed to fix it:
> 
> I have a Thinkpad T30, with a Radeon Mobility 7500 display system, feeding 
> a 1400x1050 LCD display. The machine runs Fedora Core 1, using 
> XFree86-4.3.0-55 and KDE 3.2.1. I am not using Xinerama.
> 
> My problem is when I am using this thing with a projector (which I do 
> often). Most projectors I run into can only handle 1024x768 or less, which 
> sin't too much of an issue - using KDE's REsize and Rotate tool (i.e. 
> xrandr), I can easily size my display to whatever the projector can 
> handle.
> 
> But that is where the problem starts - X correctly resizes to the desired 
> resolution (like, say, 1024x768), KDE 3.2.1 correctly refreshes, 
> OpenOffice.org 1.1.1 correctly displays fullscreen - but the image going 
> out to the projector is 1024x768, mapped to a 640x480 window, as if I had 
> set ito to a 1024x768 virtual desktop. It pans and scrolls around.
> 
> I can't figure out why this happens. The projector can do 1024x768, the 
> resolution on the LCD is 1024x768, but the output to the external video 
> (projector) from the machine is 640x480, panning around on a 1024x768 
> display.
> 
> Naturally, it all works fine under Windows.
> 
> Is there *any* way to avoid this, or to force the external display to a
> true 1024x768? I have tried it all, running xrandr to force a resize,
> turning off the LCD, etc - nothing seems to work.
> 
> My /etc/X11/XF86Config is created by redhat-config-xfree86, and contains 
> no virtual desktop size settings. This is something X is doing on its own.
> 
> TIA for any help - I have another big presentation coming up soon, and 
> want to get a fix on this.
> 
> And while we are at it - parts of presentations involve showing some 
> video. This is invoked form OpenOffice.org by running mplayer, which shows 
> it on the LCD, but not on the external display! The only way to force the 
> issue is to run "mplayer -vo x11", but that doesnt let me fullscreen :(
> 
> Any clues on this one?
> 
> Atul
> 
> -- 
> -------------------------------------------
> Atul Chitnis       | achitnis@exocore.com
> Exocore Consulting | http://www.exocore.com
> Bangalore, India   | +91 (80) 2344-0397
> -------------------------------------------
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