Hi, I am the reporter of the duplicate bug.
What I tested so far on the laptop I have.

--- proprietary driver
Start live session 7.04  + install to harddisk + INSTALL proprietary driver => 
work fine
Start live session 7.04  + install to harddisk + INSTALL proprietary driver + 
full distro upgrade to 7.10 beta=> work fine
No upgrade problem here.

--- NO proprietary driver
Start live session 7.04  + install to harddisk + no proprietary driver => work 
fine
Start live session 7.04  + install to harddisk + no proprietary driver + full 
distro upgrade to 7.10 beta => blank screen
after distro upgrade start with the 2.6.22-12 => blank screen
after distro upgrade start with the 2.6.20-16 => work fine

2 posible work around fix for upgrade user with no proprietary driver:
1)boot with 2.6.20-16 + remove radeon.ko+ restart with 2.6.22-12 => work fine
2)boot with 2.6.20-16 + install proprietary ATI driver via system => 
Administration => restricted driver manager
 + restart with 2.6.22-12 => work fine

---- tribe test
Start live session 7.10 tribe 4 + install to harddisk + no proprietary driver 
=> work fine
Start live session 7.10 tribe 5  => blank screen
The problem/regresion start with Tribe 5

---- beta cd test
fresh install 7.10 beta alternate + reboot => blank screen
live session 7.10 beta live cd  => "Start or install Ubuntu" will give blank 
screen.

------- The work around 'fix' for fresh install 7.10 beta live CD
Must select "start Ubuntu in save graphics mode"
This will start live Ubuntu CD in 1024*768 resolution
Install Ubuntu to harddisk
restart computer
resolution in still 1024*768

Must install proprietary ATI driver via system => Administration => restricted 
driver manager
Restart computer
resolution is now the correct 1280*800
No blank screen any more.
-------- end 'fix'

-- 
[Gutsy] ATI (Radeon) with pci id 1002:5a62 and Linux 2.6.22 - X will not start
https://bugs.launchpad.net/bugs/144297
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