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I didn't find any post regarding this issue on these forums, so I'm posting this here for reference for other users.
This post applies to you if:
* you use the radeon driver
* you recently upgraded to 2.6.31
* you are experiencing a black screen after UDEV loads
this leaves you unable to access your system, even with runlevel 1 (as this shows up far after UDEV). This is what we did to resolve the situation.
1. boot from the archlive cd
2. create a folder and mount your original / there
3. cat dmesg.log of the original install, you will find this: error failed to initialise radeon disabling IOCTL
4. create the following file: /etc/modprobe.conf/radeon.conf, this file should contain:
options radeon modeset=0reboot the system and enjoy GUI again.
this issue is kernel related and may be fixed in later releases.
uname -e
Linux arch.localdomain 2.6.31-ARCH #1 SMP PREEMPT Tue Oct 13 13:36:23 CEST 2009 i686 AMD Athlon(tm) XP 2700+ AuthenticAMD GNU/LinuxArch i686 on Phenom X4 | GTX760
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