I also have this Problem (freeze 10 to 60 seconds after graphical logon)
on my Pentium 4 Dual Core, using an SMP kernel in combination with a
Radeon 7000, using the "ati" or "radeon" driver in my xorg.conf.

I recently uninstalled my debian (which I was using for 3 years until
last week quite luckily), because I did an upgrade to testing (gaining
newer applications) and the error occured after that. Because I thought
the testing version was the problem, I switched to Ubuntu 6.06 and
everything went fine with the 386 kernel, but having installed the 686
kernel, the freeze came again.

Then I installed an arch linux and the error occured once again using
gnome, also using twm (instead of gnome with metacity).

So, now I conclude that the free radeon/ati driver is the problem. Using
"vesa" drivers is not really an option, because I cannot use vertical
refresh rates higher than 60 Hz, what is really an ugly flickering.
After turning off the "dri" option, the radeon driver does well, but dri
would be really nice when playing tuxracer or so.

** Changed in: xserver-xorg-driver-ati (Ubuntu)
     Assignee: (unassigned) => Oliver Storch

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system freeze when using ati radeon 7000 with xorg "ati" driver
https://launchpad.net/bugs/16873

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