After fresh install of 10.1 beta5 on ibook, X are unable to start. It do not crash, but screen is black and it is impossible to go back to framebuffer (i can kill X but black screen persist)
/var/log/Xorg.0.log look normal without errors, i will attach it.

~/.X.err is generated :

xauth:  creating new authority file /home/pavel/.serverauth.3838
X Window System Version 6.9.0
Release Date: 21 December 2005
X Protocol Version 11, Revision 0, Release 6.9
Build Operating System: SuSE Linux [ELF] SuSE
Current Operating System: Linux whowie 2.6.16-rc4-3-default #1 Mon Feb 20 15:56:05 UTC 2006 ppc
Build Date: 20 February 2006
        Before reporting problems, check http://wiki.X.Org
        to make sure that you have the latest version.
Module Loader present
Markers: (--) probed, (**) from config file, (==) default setting,
        (++) from command line, (!!) notice, (II) informational,
        (WW) warning, (EE) error, (NI) not implemented, (??) unknown.
(==) Log file: "/var/log/Xorg.0.log", Time: Mon Feb 27 10:11:15 2006
(==) Using config file: "/etc/X11/xorg.conf"
ACPI: OSPMOpen called
ACPI: Opening device
(WW) ****INVALID IO ALLOCATION**** b: 0xf0000400 e: 0xf00004ff correcting^G
(EE) end of block range 0xefffffff < begin 0xf0000000

In beta 3 and 4 X works flawlessly