I've found out that the problem was caused by KMS disabled for radeon driver - see more on https://bugs.freedesktop.org/show_bug.cgi?id=38792
** Bug watch added: freedesktop.org Bugzilla #38792 http://bugs.freedesktop.org/show_bug.cgi?id=38792 -- You received this bug notification because you are a member of Ubuntu-X, which is subscribed to xorg-server in Ubuntu. https://bugs.launchpad.net/bugs/802186 Title: after boot X server crashes (segmentation fault) with blank screen To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/xorg-server/+bug/802186/+subscriptions _______________________________________________ Mailing list: https://launchpad.net/~ubuntu-x-swat Post to : [email protected] Unsubscribe : https://launchpad.net/~ubuntu-x-swat More help : https://help.launchpad.net/ListHelp
