Debian Lenny freezes in X

[Lars <debs@utysket.dk>]

Hi
I'm running Debian Lenny (kernel 2.6.22-2) on my laptop Asus
M6Ne. After 5-10 min. in X the system freezes up (or
part of it). When it happens, the keyboard and hotkeys stops
responding. But the usb mouse/touchpad still works,
although I can't change desktop, focus windows and etc. Half the
time the powerbutton works and I can make a proper shutdown, the
other it's killing the power. I've also tried with the standard ati
module and the proprietary module fglrx. Wifi (ipw2200) module isn't
loaded.
I normally use Xfce4, but I read on bugs.debian.org something
regarding freeze and audio. So yesterday I started using Gnome to
have a stable X until the other problem got solved. But now I
experienced a freeze, similar to the Xfce4. So now I'm quite lost on
where to start.


/Lars