Red Hat Bugzilla – Bug 111320
XFree86 update breaks Xinerama on Radeon 7500
Last modified: 2007-03-27 00:12:47 EDT
From Bugzilla Helper:
User-Agent: Mozilla/5.0 (X11; U; Linux i686) Gecko/20031119 Galeon/1.3.7
Description of problem:
Before updating XFree86 today I had an ATI Radeon VE dual head card
working with xinerama (independent displays). I had an
XFree86-4.3.0-2 RPM built from an SRPM patched with the patch I
attached in bug 88748
After updating to XFree86-4.3.0-2.90.43, the same XF86Config file now
does not work with xinerama. The same thing is displayed on both
I have tried starting from scratch using redhat-config-xfree86 to
create a fresh XF86Config file and editing it to make xinerama work
and it does not.
Version-Release number of selected component (if applicable):
Steps to Reproduce:
1. Patch XFree86-4.3.0-2 SRPM with patch from bug 88748 and rebuild
2. rpm -ivh XFree86-4.3.0-2 RPM from step 1
3. Use attached XF86Config file
4. Watch Xinerama work.
5. Update to curren XFree86 errata
6. Watch Xinerama break
Actual Results: No Xinerama
Expected Results: Two independent displays
Created attachment 96272 [details]
Created attachment 96273 [details]
XF86 config file modified from redhat-config-xfree86 generated one
The Radeon driver changed not long after Red Hat Linux 9 was released,
in order to provide more support for more hardware (and newer
hardware). With the new support, the configuration of the driver
has changed for some users, in particular multi-head users. This
was observed in rawhide, during the development of Fedora Core 1
about a month or so after RHL 9 was released.
If you are using Xinerama, and it is no longer working, you need to
read the "radeon" manpage, and look at the Monitorlayout option.
You may or may not need to use that option in order to get Xinerama
to work, and you may have to experiment with different settings
to get it to work the way you want with your particular hardware.
This is the way the new Radeon driver works, and will work also in
XFree86 4.4.0 and for the forseeable future, unless the upstream
maintainers make further changes. As such, this is not a bug, but
an intentional change by the upstream driver maintainers, of how the
driver works and must be configured.
If you have further difficulties, or are unable to determine the
right configuration options that work with your setup, you can
contact the email@example.com mailing list for technical support
Closing bug NOTABUG due to configuration related issue.