Well, I dont' know if you solved your problem with the xorg-radeon driver, but
after working out the xorg.conf file, my monitor displays a perfect resolution.
Here is my xorg.conf, maybe it could help you if you haven't figured a solution
yet.
Section "ServerLayout"
Identifier "amdcccle Layout"
Screen 0 "amdcccle-Screen[1]-0" 0 0
EndSection
Section "Files"
EndSection
Section "Module"
Load "glx"
EndSection
Section "Monitor"
Identifier "PLE2407HDS"
HorizSync 29-81
VertRefresh 55-76
Option "VendorName" "IVM"
Option "ModelName" "PLE2407HDS"
Option "DPMS" "true"
Option "PreferredMode" "1920x1080"
Option "TargetRefresh" "60"
Option "Position" "0 0"
Option "Rotate" "normal"
Option "Disable" "false"
Modeline "1920x1080" 148.50 1920 2008 2052 2200 1080 1084 1089 1125
EndSection
Section "Device"
Identifier "Default Device"
Driver "fglrx"
EndSection
Section "Device"
Identifier "amdcccle-Device[1]-0"
Driver "fglrx"
Option "Monitor-DFP2" "PLE2407HDS"
Option "NoDDC" "true"
Option "IgnoreEDID" "true"
BusID "PCI:1:0:0"
EndSection
Section "Screen"
Identifier "Default Screen"
DefaultDepth 24
EndSection
Section "Screen"
Identifier "amdcccle-Screen[1]-0"
Device "amdcccle-Device[1]-0"
DefaultDepth 24
SubSection "Display"
Viewport 0 0
Depth 24
EndSubSection
EndSection
--
Iiyama monitor's native resolution does not display properly
https://bugs.launchpad.net/bugs/473114
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