Bug 730729

Summary: Xinerama doesn't work
Product: Red Hat Enterprise Linux 6 Reporter: Søren Sandmann Pedersen <sandmann>
Component: xorg-x11-drv-qxlAssignee: Søren Sandmann Pedersen <sandmann>
Status: CLOSED ERRATA QA Contact: SPICE QE bug list <spice-qe-bugs>
Severity: unspecified Docs Contact:
Priority: unspecified    
Version: 6.2CC: cfergeau, cmeadors, dblechte, kem
Target Milestone: rc   
Target Release: ---   
Hardware: Unspecified   
OS: Unspecified   
Whiteboard:
Fixed In Version: Doc Type: Bug Fix
Doc Text:
Story Points: ---
Clone Of:
: 732423 732467 (view as bug list) Environment:
Last Closed: 2011-12-06 15:08:42 UTC Type: ---
Regression: --- Mount Type: ---
Documentation: --- CRM:
Verified Versions: Category: ---
oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: --- Target Upstream Version:
Embargoed:
Bug Depends On:    
Bug Blocks: 732423, 732467, 750568    
Attachments:
Description Flags
xorg.conf file with a Xinerama setup none

Description Søren Sandmann Pedersen 2011-08-15 14:33:39 UTC 
Xinerama does not work on 6.2. This may be a bug in xorg-x11-drv-qxl, in qemu, or in spice-server.
Comment 2 Søren Sandmann Pedersen 2011-08-19 14:41:01 UTC 
Some initial investigation:

  - The spice client crashes when the server first asks for four screens. 
    Starting spicec again makes it display the four windows and run without
    crashing.

  - There are two relatively straightforward fixes to the X driver, both having
    to do with the extra devices not emulating VGA.

         - The PCI probing skips non-VGA devices

         - The "save state" routine saves the state of the VGA fonts. When 
           that is called for non-VGA hardware it gets applied to the one
           VGA device, putting it into VGA mode which then creates chaos.

   - With those fixes, the X server will start in Xinerama mode, but there is
     something wrong with the tablet; it seems to be stuck on the third screen.

     Running without the tablet then seems to work.
Comment 3 Søren Sandmann Pedersen 2011-08-22 15:00:12 UTC 
RHEL-6:xorg-x11-drv-qxl-0_0_14-5_el6)
Comment 5 Søren Sandmann Pedersen 2011-08-22 15:09:44 UTC 
Created attachment 519304 [details]
xorg.conf file with a Xinerama setup

QA, I'll attach an xorg.conf file that works for me, although it may be that you will need to adjust the PCI IDs according according to how your specific VM is set up. You can find the devices by doing

    lspci -v 

as root and looking for QXL devices.
Comment 7 errata-xmlrpc 2011-12-06 15:08:42 UTC 
Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory, and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

http://rhn.redhat.com/errata/RHEA-2011-1621.html