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In this case:
Computer : Compaq Presario CQ5101BE.
Video: nVidia GT200 (GeForce G210).
Monitor: 1024×768 capable, no more.
System: Ubuntu 9.10

What I expected to happen : install a system with correct screen
resolution

What happened instead:
Rebooted just after the system was installed.
Monitor running out of sync (6 unreadable striped desktops side by side).
By pure luck, it booted once in a readable way.
So, I was able to reset the session resolution 1152×864 I think -> 1024x768.
I was able to see what I was doing.
But Ubuntu was still starting up unreadably, GDM was used blindly.
A friend mentioned the Nvidia proprietary driver.
I switched to it and there it went booting in a readable 1024x768 way.

In the past, I've had to fix several machines with screens limited to 800×600.
This was adding a cryptic Xorg.conf line to raise the Maximum Horizontal 
Frequency.
This was the opposite problem.

Obviously, both problems have the same solution.
- the Horizontal Frequency must be high enough and need no tweaking.
- but the default resolution after installation must be 800×600, unless the 
monitor "tells it"
- so that the user may raise it with System/Preferences/Screen Resolution and 
accept or deny the result visually.
- for monitor change or other issues, Ubuntu (Grub) must have a fail proof way 
of booting which, alongside other conservative boot parameters, sets the screen 
resolution to 800×600 (even if "the monitor tells it" I suppose).
- Screen configuration must clearly distinguish between system startup (GDM) 
and user login modes.
- User Login mode must have a setting named "default", meaning "the same as 
system mode".

This is the way at least one other system does it ;-)

Hoping this will help (many screen resolution issues).

** Affects: xorg (Ubuntu)
     Importance: Undecided
         Status: Incomplete

-- 
Various bad Monitor resolutions after installation or monitor change
https://bugs.launchpad.net/bugs/538600
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