Public bug reported:

this has been a long term problem with X11.  I think it dates back to
6.06.

laptop: compaq presario 1700t

lspci reports video as:
01:00.0 VGA compatible controller: ATI Technologies Inc Radeon Mobility M6 LY

install sets up video as 1024x768 which works ok but is very fuzzy
because of mismatch between native lcd resolution and displayed
resolution.

to trigger the problem, system->preferences->screen resolution.  change
resolution to 1400x1040.  display changes to higher resolution and has
random broken blocks of screen data.

I have screen capture if it is any help

ProblemType: Bug
Architecture: i386
Date: Wed Mar 14 21:33:24 2007
DistroRelease: Ubuntu 7.04
Uname: Linux slappy 2.6.20-10-generic #2 SMP Mon Mar 12 00:02:49 UTC 2007 i686 
GNU/Linux

** Affects: Ubuntu
     Importance: Undecided
         Status: Unconfirmed

-- 
X11 does not support laptop lcd native resolution
https://launchpad.net/bugs/92408

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