PowerPC + radeon + Kernel Mode Setting (KMS) has problems with AGP. If you force pci mode radeon.agpmode=-1 does this help?
Userspace mode setting with radeon was dropped after Ubuntu 12.04/Debian wheezy so you have to use KMS in 12.10 onwards. KMS on PowerPC is something that really needs sorting. If you want to help with the issue, then report it on Bugzilla https://bugs.freedesktop.org/ or even the PowerPC kernel mailing list https://lists.ozlabs.org/pipermail /linuxppc-dev/ . -- 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/1125908 Title: System freeze with radeon driver on G4 AGP Graphics To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/xserver-xorg-video-ati/+bug/1125908/+subscriptions _______________________________________________ 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
