It seems to start up in 1024x768 according to the log, are you sure it was 800x600?
(II) RADEON(0): Output VGA-0 using initial mode 1024x768 after xf86InitialConfiguration However, the vertical DPI is wrongly calculated, 113 would correspond to 1024 vertical pixels: (**) RADEON(0): Display dimensions: (300, 230) mm (**) RADEON(0): DPI set to (86, 113) -- 800x600 resolution with ATI card on live boot makes install difficult https://bugs.launchpad.net/bugs/154142 You received this bug notification because you are a member of Ubuntu Bugs, which is the bug contact for Ubuntu. -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
