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Thread: multiple monitors - strange behavior

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hoping can me understand, , perhaps correct. trying set 3 monitors single desktop environment (similar xinerama did) i'm trying use included radeon driver , configure through xorg.conf.

in searching, ran across helpful thread: http://ubuntuforums.org/showthread.php?t=1431893

have functionality, we'll in minute, in 3 monitors, i'm experiencing strange results i'm praying able assist in clearing up.

physical configuration: left monitor , right monitor hooked pcie dual head card. middle monitor hooked onboard vga. ati radeons. proprietary driver not installed (yay!).

here experience drag mouse left right, , again....

on left monitor, mouse traverses fine. upon reaching rightside of monitor, mouse icon skips on middle monitor , onto right monitor. if not traverse entire width of right monitor, , drag mouse left, mouse icon shows in left monitor. 1 might think "okay! so, middle monitor not being recognized x". well, this: if continue pull mouse way on right hand side of right monitor, , bring left again, shows middle monitor.

long , short - mouse icon skips on middle monitor if it's traveling east, lands in middle monitor if, , if, mouse goes way east , west again.

have included xorg.conf file below.

*really* appreciate has insight. thank you!!!!

code:
section "serverlayout"      identifier     "basic setup"      screen      0  "screen1"      screen        "screen2" rightof "screen1"      screen        "screen3" rightof "screen2"  endsection    section "device"      identifier  "deviceleft"      driver      "radeon"      busid       "pci:2:0:0"  endsection  section "device"      identifier  "devicecenter"      driver      "radeon"      busid       "pci:1:5:0"  endsection  section "device"      identifier  "deviceright"      driver      "radeon"      busid       "pci:2:0:1"  endsection    section "screen"      identifier "screen1"      device     "deviceleft"      defaultdepth  24      subsection "display"          depth     24      endsubsection  endsection  section "screen"      identifier "screen2"      device     "devicecenter"      defaultdepth  24      subsection "display"          depth     24      endsubsection  endsection  section "screen"      identifier "screen3"      device     "deviceright"      defaultdepth  24      subsection "display"          depth     24      endsubsection  endsection



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