https://bugs.freedesktop.org/show_bug.cgi?id=73530
--- Comment #50 from Paul Menzel paulepanter@users.sourceforge.net --- That line was the same testing the same built Linux kernel a second time.
[drm:radeon_fixup_lvds_native_mode], Native mode: 1920x1080-138780
It also took one xrandr off/auto cycle to get the display working.