From Bugzilla Helper: User-Agent: Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.0) Description of problem: If, as I do, you have a graphics card capable of multihead, you can get a situation where the best resolution if 640x480. This is forced upon the normal (higher) resolution by having a virtual "window" onto the desktop. Version-Release number of selected component (if applicable): How reproducible: Always Steps to Reproduce: 1.Plug in the "wrong" monitor with a multihead capable graphics card 2.Use X (either Gnome or KDE) 3. Actual Results: A 640x480 "window" onto a 1028x768 desktop (or gdm) Expected Results: A 1028x768 desktop filling my screen. Please note that I do not and never have had a second monitor. Additional info: Full description here :- http://www.linuxforums.org/forum/viewtopic.php?t=19600 FIX. Add these lines to the Device section of /etc/X11/XF86Config Option "CloneHSync" "30.0-72.0" Option "CloneVRefresh" "50.0-160.0" (the numbers - 30.0-72.0 and 50.0-160.0 - dependant upon monitor used) And add a dummy screen and monitor section to the same config file. This FIX / Work around works for Fedora Core 1 and Core 2, Mandrake 10.0 Community (was not needed for Mandrake 9.2 or Slackware 9.1, which I have on the same PC). Is this a bug or a feature that needs better documentation ? regards Tony
If you change monitors, you need to reconfigure the X server, or it will not work correctly depending on the particulars of the monitors and various other factors. This issue may not occur in the same way on Mandrake or other distributions perhaps due to different configuration files settings between the distributions. The Radeon driver in each of the 3 distributions is also quite different. The Clone settings you indicate may work around your particular problem for your case, but they are not settings which should be applied to all Radeon hardware for all users. If you rerun the config tool: "system-config-display --reconfig" it will generate a new config file, which will handle your new monitor. Assuming your new monitor can be correctly DDC probed, it should just work without any further configuration. If the problem recurs however, please attach your complete X server log and config file from the problematic run for analasis. Thanks for the report.
Since this bugzilla report was filed, there have been several major updates to the X Window System, which may resolve this issue. Users who have experienced this problem are encouraged to upgrade to the latest version of Fedora Core 3, which can be obtained from: http://fedora.redhat.com/download If this issue turns out to still be reproduceable in the latest version of Fedora Core, please file 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.