I was able to fix the problem with a workaround:

- I know from the TV specifications (and from Lucid settings) that the maximum 
resolution of one of my Panasonic TV is 1360x756
- I search for the 1360x768 modeline:
cvt 1360 768
- I obtain a modeline, wich I add to the TV (VGA1) with xrandr:
xrandr --newmode "1360x768_60.00"   84.75   1360 1432 1568 1776   768 771 781 
798 -hsync +vsync
xrandr --addmode VGA1 1360x768_60.00
Then, I write a script where I add the modeline, switch off everything,
than switch on both the TV and the notebook screen (LVDS1). In my case I
place the TV on top, because my Intel graphic board doesn't allow a
horizontal resolution larger than 4096.

Here's teh script:

#1/bin/bash
xrandr --newmode "1360x768_60.00"   84.75   1360 1432 1568 1776   768 771 781 
798 -hsync +vsync
xrandr --addmode VGA1 1360x768_60.00
xrandr --output VGA1 --off
xrandr --output LVDS1 --off
xrandr --output VGA1 --mode 1360x768_60.00 --pos 0x0 --output LVDS1 --mode 
1024x600 --pos 0x768


When I launch this script I have a correct resolution on both my screens.
Obvioulsy, I make a different script for the other Panasonic TV too (which has 
a different maximum resolution).

Tested only with an Intel graphic card.
With Nvidia Nuveau I didn't try (I'm still using the proprietary driver and it 
seems to work, with some workaraounds too).

-- 
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which is subscribed to xorg-server in Ubuntu.
https://bugs.launchpad.net/bugs/973163

Title:
  Xorg doesn't detect correct resolution of VGA Panasonic TV

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