This is just a wild guess, but have you tried changing horizontal sync, 
vertical refresh or X mode?

For several months I have had graphics problems with LTSP5.
The screen had sizable chunks that would not update.

HP L1906 Flat Panel work with the following changes to lts.conf
X_HORZSYNC = 37.9-80
X_VERTREFRESH = 60.3-75
X_MODE_0 = 1280x1024

I would guess that particularly trying different 'X mode' setting may 
help in your case.
(remember to reboot the client after saving changes to lts.conf)

[EMAIL PROTECTED] wrote:
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> Today's Topics:
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>    1. ELO Touchscreen configuration (David Mummery)
>
>
> ----------------------------------------------------------------------
>
> Message: 1
> Date: Fri, 18 May 2007 11:57:58 +0100
> From: "David Mummery" <[EMAIL PROTECTED]>
> Subject: [Ltsp-discuss] ELO Touchscreen configuration
> To: [email protected]
> Message-ID: <[EMAIL PROTECTED]>
> Content-Type: text/plain;     charset="us-ascii"
>
> Hi everyone -
>
> I'm running LTSP-5 and so far I cannot calibrate an ELO Touchscreen properly.
>
> It is an ELO 1715L attached to a terminal.
>
> In lts.conf I have set:
>
> USE_TOUCH = Y
> X_TOUCH_DEVICE = /dev/ttyS0
>
> This allows me to use the touchscreen but my finger and the cursor are not in 
> the same place on the screen.
>
> At bottom left corner, the cursor is a bit to the right and above my finger - 
> maybe 1cm in both directions.
>
> As I move towards upper right corner, cursor gets further and further away 
> from my finger. The cursor becomes maybe 6cm above and to the right of my 
> finger at the extreme position. The cursor reaches the corner much before my 
> finger does.
>
> I have tried setting values for X_TOUCH_MINX (and MINY) and X_TOUCH_MAXX (and 
> MAXY) but it makes no difference.
>
> I also tried setting MinX MinY as suggested in 
> http://osdir.com/ml/linux.terminal-server.devel/2004-10/msg00003.html
>
> but it makes no difference.
>
> Does anyone have any ideas or know how to fix my problem?
>
> - David
>
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