Just adding the "radeon.modeset=0" to the natty's kernel's parameters causes the system to be able to boot (into a usable state, with X etc, of course not the same 3D performance etc), and not messages like the previous one with KMS not disabled. So for me, it seems only using or not using KMS cause this kernel bug? If it's that ... I'm also attaching the kernel log I got now with "radeon.modeset=0" with natty's kernel (Linux orion 2.6.38-7-generic-pae #36-Ubuntu SMP Fri Mar 18 22:23:27 UTC 2011 i686 i686 i386 GNU/Linux). I've also got this one with network console grabbed on another machine, so maybe it's fair enough now to compare with the previous.
** Attachment added: "netconkern-modeset-disabled.log" https://bugs.launchpad.net/ubuntu/+source/xserver-xorg-video-ati/+bug/735126/+attachment/1924760/+files/netconkern-modeset-disabled.log -- You received this bug notification because you are a member of Ubuntu-X, which is subscribed to xserver-xorg-video-ati in ubuntu. https://bugs.launchpad.net/bugs/735126 Title: [natty] system freezes on boot without disabling KMS _______________________________________________ Mailing list: https://launchpad.net/~ubuntu-x-swat Post to : ubuntu-x-swat@lists.launchpad.net Unsubscribe : https://launchpad.net/~ubuntu-x-swat More help : https://help.launchpad.net/ListHelp