Tried the thing with cat /etc/modprobe.d/radeon-kms.conf options radeon modeset=0 which was proposed in older versions as workaround. but it is not acceptable. Works only with low resolution and no evidence that the bug goes away.
Had it again, however! Kernel = Linux atviedl2a149 3.8.0-31-generic #46-Ubuntu SMP Tue Sep 10 20:03:44 UTC 2013 x86_64 x86_64 x86_64 GNU/Linux -- You received this bug notification because you are a member of Desktop Packages, which is subscribed to xserver-xorg-video-ati in Ubuntu. https://bugs.launchpad.net/bugs/1100286 Title: [drm:radeon_cs_ib_chunk] *ERROR* Failed to schedule IB ! Status in X.org XServer - ATI gfx chipset driver: Fix Released Status in “xserver-xorg-video-ati” package in Ubuntu: Fix Released Bug description: Problem : On boot my computer is perfect for a few minuts, then my screen start to panic and finally totaly freeze. Graphic card : VGA compatible controller: Advanced Micro Devices [AMD] nee ATI Manhattan [Mobility Radeon HD 5430 Series] Driver : xserver-xorg-video-ati How to reproduce : Booting on Ubuntu Raring Ringtail 13.04 Syslog : [drm:radeon_cs_ib_chunk] *ERROR* Failed to schedule IB ! To manage notifications about this bug go to: https://bugs.launchpad.net/xserver-xorg-driver-ati/+bug/1100286/+subscriptions -- Mailing list: https://launchpad.net/~desktop-packages Post to : desktop-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~desktop-packages More help : https://help.launchpad.net/ListHelp