Either the latest git version or my - very rare - cold reboot solved it. I don't know, but the errors are away :-)
** Changed in: mesa (Ubuntu) Status: New => Invalid -- You received this bug notification because you are a member of Ubuntu-X, which is subscribed to mesa in Ubuntu. https://bugs.launchpad.net/bugs/1831688 Title: Flickering triangles in OpenGL apps on Radeon KAVERI To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/mesa/+bug/1831688/+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