video settings from ltsp4.2 dont work in Hardy

[Kai Wollweber]

Hello,

in one classroom we use a bunch of older igel terminals. On LTSP 4.2. they 
work fine with XDMCP and the following configuration from lts.conf:

[igel1]
        X_SERVER = nsc
        X_COLOR_DEPTH = 16
        X_MODE_0 = 1024x768
        X_VERTREFRESH = 56-75
	X_HORZSYNC = 31-83
 
These settings are critical under LTSP 4.2. Any changes cause a failure of the 
xserver.

With ubuntu 8.04 I tried the same config and several variations including vesa 
X_SERVER and different video settings but none of them worked.
 
On boot following the "ubuntu-screen" with the progress bar the video switches 
to black screen with blinking cursor in the upper left corner. Finally the 
screen is totally black. This reminds me of the xserver trials on the boot 
process of LTSP 4, if no valid video setting could be found.

On the server the message from ldminfod repeates until infinity:

May  5 12:32:47 pardosa2 ldminfod[2214]: connect from 192.168.0.223 
(192.168.0.223)
May  5 12:33:53 pardosa2 ldminfod[2221]: connect from 192.168.0.223 
(192.168.0.223)
May  5 12:41:12 pardosa2 ldminfod[2243]: connect from 192.168.0.223 
(192.168.0.223)
May  5 12:49:17 pardosa2 ldminfod[2250]: connect from 192.168.0.223 
(192.168.0.223)

Other terminals work fine without specific settings in lts.conf. I am sure 
that lts.conf is read correctly cause i can change the settings of the other 
terminals.

I need help how to explore the failing boot process (which xserver is choosen? 
which modeline is generated?) but I don't know how to explore these 
information nor how to alter the video-settings systematically.

TIA for any hints.
-- 
Kai Wollweber
Integrierte Gesamtschule
Eckernförde