Description of problem:

Dual head on HP dc5850 desktop, using the "r500" driver in zaphod mode, the mouse pointer is confined to one of the monitor and cannot move to the other monitor.

Version-Release number of selected component (if applicable):

xorg-x11-drv-ati-6.6.3-3.27.el5-x86_64

How reproducible:

Always with customer's hardware

Steps to Reproduce:
1. Configure dual head, with individual desktop in system-config-desktop
2. Restart X
  
Actual results:

The two monitors are detected, screen :0 and :1 and available, but the mouse pointer remains on one monitor.

Moving the mouse to the opposite side can move it around freely on the 2nd screen, but cannot move back to the 1st screen.

Changing "LeftOf" to "RightOf" in the xorg.conf cause the mouse to be trapped on the first screen, ie. can move it around freely on the 1st screen, but cannot move it to the 2nd screen.

Expected results:

The mouse pointer can move between monitors

Additional info:

Initially thought it could have been related to upstream commit 18a611f3cc7f5eea95cd73a9dcc7913c922fcbc:

    http://cgit.freedesktop.org/xorg/driver/xf86-video-ati/commit/?id=718a611f3cc7f5eea95cd73a9dcc7913c922fcbc

But that is not the case, a test package with this patch included does not fix the issue.

Additional tests include changing the initial layout created by s-c-display:

    Section "ServerLayout"
            Identifier     "Multihead layout"
            Screen      0  "Screen0" LeftOf "Screen1"
            Screen      1  "Screen1" 0 0
            InputDevice    "Keyboard0" "CoreKeyboard"
            Option      "Xinerama" "off"
            Option      "Clone" "on"
    EndSection

to

    Section "ServerLayout"
           Identifier     "Multihead layout"
           Screen      0  "Screen0" LeftOf "Screen1"
           Screen      1  "Screen1" 0 0
           InputDevice    "Keyboard0" "CoreKeyboard"
    EndSection

    Section "ServerFlags"
           Option       "Xinerama" "off"
    EndSection
    
But that did not make any difference.