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I use debian with XFree86 4.3.x but the WSXGA is not sup­ported by default. To enable the video res­o­lu­tion of 1680x1050 (WSXGA)  you need to edit the XFree86 con­fig file, located at /etc/X11/XF86Config-4:

Sec­tion “Mon­i­tor“
Iden­ti­fier      “philips200w“
Option        “DPMS“
Horiz­Sync    30–93
VertRe­fresh    56–85
Dis­play­Size    433 271
Mod­e­line    “1680x1050” 146 1680 1784 1960 2240 1050 1053 1059 1089
EndSection

Sec­tion “Screen“
Iden­ti­fier      “Default Screen“
Device          “radeon 7000ve rv100“
Mon­i­tor         “philips200w“
Default­Depth    24
Sub­Sec­tion “Dis­play“
Depth           24
Modes           “1680x1050” “1600x1200” “1280x1024” “1280x960“
End­Sub­Sec­tion
Sub­Sec­tion “Dis­play“
Depth           1
Modes           “1680x1050” “1600x1200” “1280x1024” “1280x960“
End­Sub­Sec­tion
EndSection