Booted notebook. While in GUI added external monitor. Image displays on both. Pressing Fn + CRT/LCD switch has no effect. Switched to a text console, CRT/LCD switching works there. Back to X, image displays again on both monitors. This is a DELL Latitude D600. I haven't tried rebooting/restarting X with external monitor added.
Please report this issue to X.Org developers by filing a bug report in the X.Org bugzilla located at http://bugs.freedesktop.org in the "xorg" component. Once you've filed your bug report to X.Org, if you paste the new bug URL here, Red Hat will continue to track the issue in the centralized X.Org bug tracker, and will review any bug fixes that become available for consideration in future updates. Setting status to "NEEDINFO_REPORTER", awaiting X.Org bug URL for tracking.
Filled as https://bugs.freedesktop.org/show_bug.cgi?id=4329 Closing as UPSTREAM