mouse and keyboard problem

[regis rampnoux]

Hi,

I have Xorg 7.3_1. With a radeon card (ati driver), an USB mouse and a PS/2
keyboard. It worked fine with FreeBSD 6.3-STABLE.

I upgraded to FreeBSD 7.0-STABLE ... and I can't use xorg:
I launch xdm manually for testing with -nodaemon arg, I can login, 
move a windows, go to the syscons (Ctrl-Alt-F1...), 
type something in a xterm window until I press a mouse button.

After mouse buttons and keyboard are not responding, but cursor is moving.
And if I try to shutdown from a distant terminal (with ssh) it never finish. 
I need to press the reset button on the computer! Disks are not synced 
(fdisk required).
I tried with twm and windowmaker as window managers (and without wm).

I don't found related message in the logs (Xorg.0.log, console.log,
message.log). Excepted about drm:
[drm] writeback test failed
but when I have
[drm] writeback test succeeded in 1 usec
there is the problem too. 
I have rebuild all ports installed and check the libc version required.
( twice at least for every port and kernel and world, mergemaster 
for config file...)
What I forget to do?

-- 
regisr