Yes I had the same problem and it drove me nuts. The lovely people at Elonex were very friendly, but completely useless, the best they could offer was to rebuild the hard disk at my own expense with 8.04, as it was my fault for trying to upgrade to unsupported software - I politely declined. I am no expert in Linux, but like an intellectual challenge, though this one taxed my patience to the limit!
The work around I found was to put in a line explicitly defining the PanelSize in the xorg.conf file. Search around on google for how to edit that file if you haven't done it before. I think this is probably all you need to do, but I spent some time trying to find a work around so I also am using the OpenChrome drivers, (the Via chip in the Elonex is a CX700) and have put in the monitor size in the conf file too, neither of these worked, but I have not dared remove them yet as I wasted so much work time already on this

, and now the system is working fine I daren't waste more time on it.
So what i have added into my default xorg.conf is this (below), but as I say I suspect all you need is the line defining the PanelSize, so try that line first then add the other lines if this doesn't work, and download the drivers from the OpenChrome site if necessary but I think they are already included with Jaunty:
"Device"
Indetinfier "Configured Video Device"
Driver "openchrome"
Option "PanelSize" "1024x600"
EndSection
Section "Monitor"
Indentifier "Configured Monitor"
DisplaySize 221 129 # 117 DPI @ 1024x600
Opiton "noDDC"
EndSection
Please let me know how all you poor unsupported Elonex customers get on, and if you find any other mods that work, but I am finding this works just fine and really like Jaunty, especially the fast load time.
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