Ok, this is certainly a kernel issue. After changing over to Fedora's 2.6.29.1-111 kernel, the issue has gone away.
Here are related kernel log entries when the problem was occurring with the ubuntu kernel: [ 30.413499] radeonfb 0000:00:10.0: Invalid ROM contents [ 30.593004] [drm] Initialized radeon 1.29.0 20080528 on minor 0 [ 31.163190] radeonfb 0000:00:10.0: putting AGP V2 device into 4x mode [ 31.461184] [drm:radeon_do_init_cp] *ERROR* could not find ioremap agp regions! -- r300 on "PowerBook G4" mac: only swrast after booting and backgrounds render blue instead of black https://bugs.launchpad.net/bugs/370200 You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
