X doesn't start, strange problem.

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https://bbs.archlinux.org – Hi,I have a strange problem in order to start X.On the first boot, I have a black screen all the time when I start kdm / X, at this time I cannot access to "TTY" but I have an access on the PC via SSH.When I reboot, KDM/X starts correctly.Xorg log on the first boot is :This is a pre-release version of the X server from The X.Org Foundation. It is not supported in any way. Bugs may be filed in the bugzilla at http://bugs.freedesktop.org/. Select the "xorg" product for bugs you find in this release. Before reporting bugs in pre-release versions please check the latest version (HowTos)