On Tue, 22 Jul 2008 06:03:16 -0400 "William L. Maltby" CentOS4Bill@triad.rr.com took out a #2 pencil and scribbled:
I need to start running a dual head on one of my machines. Eventual target is CentOS 5.x. Decided to test first on my 4.6 setup (eventually it will achieve 5.x). Both machines are fully up to date.
The test machine is 4.6, 2 radeon video cards. Searched the web, CentOS site, even bugzilla. This bugzilla entry from a 4.2 system), http://bugs.centos.org/view.php?id=1875 had only a WFM response.
I've attached a gzipped text file of pertinent information.
Briefly, kudzu did the right thing when I installed the second card. System-config-display also behaved correctly. X start ok, but will only use one head at a time. Adding a second "BusID" so that both cards are explicitly addressed didn't help. When the 2 "BusID" entries are switched, the active screen doesn't move (it's always "Screen0") and the ignored screen ("Screen1") remains the same. The monitor attached to the video card for "Screen0" becomes the active one.
Q1: Anyone have a two video card CentOS 4.6 setup working?
Q2: Is it working in CentOS 5?
Q3: Anyone see something I'm doing wrong? Suggestions?
TIA,
This was addressed on the list at one point, and marked as solved by the poster.
http://lists.centos.org/pipermail/centos/2007-May/080915.html
Does this help you out? I haven't had occasion to play with dual head yet.
A quick google also turned this up, but it is not directly related to CentOS, I run an nvidia card and can't speak to how well this would work for you.
http://www.linuxine.com/2008/06/how-to-enable-dual-monitors-with-ati-diplay-...
Mind the line wrapping.
HTH
Alex White