adding "radeon.modeset=0" in /etc/default/grub solved the problems. Thank you very much :)
-- [RV515] [X1400] screen errors https://bugs.launchpad.net/bugs/347016 You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. -- ubuntu-bugs mailing list [email protected] https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
