Hi Rob - Happy ThanksGiving:

First - there are specific and well known bugs in Ubuntu with that Intel Integrated GMA:

Reference:
http://www.thinkwiki.org/wiki/Intel_Graphics_Media_Accelerator_X3100

Suggestions:

A)   Try the 915resolution tool:  

1. To install the package run the command ” sudo apt-get install 915resolution “
2. Now run ” sudo 915resolution -l “
3. You should see a list of different modes of resolution, like this,
Intel 915GM VBIOS Hack : version 0.1
Chipset: 915GM
Mode 30 : 640ื480, 8 bits/pixel

Mode 32 : 800ื600, 8 bits/pixel

Mode 34 : 1024ื768, 8 bits/pixel

Mode 38 : 1280ื1000, 8 bits/pixel

Mode 3a : 1600ื1200, 8 bits/pixel

Mode 3c : 1920ื1440, 8 bits/pixel

Mode 41 : 640ื480, 16 bits/pixel

Mode 43 : 800ื600, 16 bits/pixel

Mode 45 : 1024ื768, 16 bits/pixel

Mode 49 : 1280ื800, 16 bits/pixel

Mode 4b : 1600ื1200, 16 bits/pixel

Mode 4d : 1920ื1440, 16 bits/pixel

Mode 50 : 640ื480, 32 bits/pixel

Mode 52 : 800ื600, 32 bits/pixel

Mode 54 : 1024ื768, 32 bits/pixel

Mode 58 : 1280ื800, 32 bits/pixel

Mode 5a : 1600ื1200, 32 bits/pixel

Mode 5c : 1920ื1440, 32 bits/pixel

Mode 60 : 1280ื770, 8 bits/pixel

Mode 61 : 1280ื770, 16 bits/pixel

Mode 62 : 1280ื770, 32 bits/pixel

Mode 63 : 512ื771, 8 bits/pixel

Mode 64 : 512ื771, 16 bits/pixel

Mode 65 : 512ื771, 32 bits/pixel
3. To change to the desired mode, say for example, mode 5a, which is 1600ื1200 with 32 bpp, you would run
” 915resolution 5a 1600 1200 32 “
Now to fully set the mode, type sudo gedit /etc/default/915resolution,
a relatively short text file will pop up, edit this file by changing
MODE to the MODE that you selected. Eg, the mode line should now be ;
MODE=5a
Change the XRESO and YRESO values to correspond with your selection, for our example, they should look like this;
XRESO=1600
YRESO=1280
Finally, set the BIT value to the bpp you selected, in our case,32;
BIT=32
Now save the file and exit it.
4. Now restart x by pressing
<CTRL>-<ALT>-<BACKSPACE>. The 1st time you log in, X might
crash and restart itself at the new
resolution, so don’t worry if it does that.
Reference: http://mcsp.wartburg.edu/figura/D620.html

A)  It appears as if your modeline is not correct - Go here and get the correct modeline:

http://xtiming.sourceforge.net/cgi-bin/xtiming.pl

C) Here's an example configuration from someone who had finally successfully done both with an Intel x3310 and external monitor:
http://www.linux-on-laptops.com/forum/archive/index.php/t-2702.html

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Catch the January PLUG HackFest!   Kristy Westphal, CSO for the Arizona Department of Economic
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presentation on forensics.

> Date: Wed, 26 Nov 2008 10:39:18 -0700
> From: wultsch@gmail.com
> To: PLUG-discuss@lists.plug.phoenix.az.us
> Subject: X11 issue
> 
> I just did a fresh install of Ubuntu 8.10 on to a box with an intel
> x3100 integrated graphics card connected to a 22 inch lcd (toshiba
> 22LV505) display that should be capable of 1680x1050. I do not care
> about video acceleration, the box has a quad core that should be able
> to deal well enough without, though it would be nice.
> 
> Using 'vesa' X11 works, but only for less than optimal values of works
> (800x600). Using 'intel' I see a momentary bit of display screen, and
> then black.
> 
> Does anyone have any suggestions (or for that matter example xorg.conf
> 's ?) I have included the relevant log and (rather pathetic) conf
> files.
> 
> I see a couple of things that look interesting in the X11 logs:
> (WW) VESA(0): Bad V_BIOS checksum
> WTF?
> 
> (II) Module "ddc" already built-in
> (II) VESA(0): VESA VBE DDC supported
> (II) VESA(0): VESA VBE DDC Level none
> (II) VESA(0): VESA VBE DDC transfer in appr. 0 sec.
> (II) VESA(0): VESA VBE DDC read failed
> 
> Can I take this to mean that X11 could not pull compatible modes from
> the monitor?
> 
> (II) VESA(0): Total Memory: 127 64KB banks (8128kB)
> (II) VESA(0): Configured Monitor: Using default hsync range of 31.50-37.90 kHz
> (II) VESA(0): Configured Monitor: Using default vrefresh range of 50.00-70.00 Hz
> (WW) VESA(0): Unable to estimate virtual size
> (II) VESA(0): Not using built-in mode "1600x1200" (no mode of this name)
> (II) VESA(0): Not using built-in mode "1280x1024" (no mode of this name)
> (II) VESA(0): Not using built-in mode "1024x768" (no mode of this name)
> (II) VESA(0): Not using built-in mode "800x600" (no mode of this name)
> (II) VESA(0): Not using built-in mode "640x480" (no mode of this name)
> (WW) VESA(0): No valid modes left.  Trying less strict filter...
> (II) VESA(0): Configured Monitor: Using hsync range of 31.50-37.90 kHz
> (II) VESA(0): Configured Monitor: Using vrefresh range of 50.00-70.00 Hz
> (WW) VESA(0): Unable to estimate virtual size
> (II) VESA(0): Not using built-in mode "1600x1200" (hsync out of range)
> (II) VESA(0): Not using built-in mode "1280x1024" (hsync out of range)
> (II) VESA(0): Not using built-in mode "1024x768" (hsync out of range)
> (--) VESA(0): Virtual size is 800x600 (pitch 800)
> (**) VESA(0): *Built-in mode "800x600"
> (**) VESA(0): *Built-in mode "640x480"
> (==) VESA(0): DPI set to (96, 96)
> (II) VESA(0): Attempting to use 60Hz refresh for mode "800x600" (115)
> (II) VESA(0): Attempting to use 60Hz refresh for mode "640x480" (112)
> 
> Refresh rate issues, I would think...
> 
> -- 
> Rob Wultsch

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