Je te propose de modifier deux sections de ton xorg.conf ainsi :

Section "Monitor"
         Identifier             "L1715S"
         Option         "DPMS"
        HorizSync               30-83
        VertRefresh     56-75
EndSection

Section "Screen"
        Identifier              "Default Screen"
        Device          "Carte vidéo générique"
        Monitor         "L1715S"
        DefaultDepth    24
        SubSection "Display"
                Depth           1
                Modes           "1024x768" "832x624" "800x600" "640x480" 
"720x400"
        EndSubSection
        SubSection "Display"
                Depth           4
        Modes                   "1024x768" "832x624" "800x600" "640x480" 
"720x400"
        EndSubSection
        SubSection "Display"
                Depth           8
                Modes           "1024x768" "832x624" "800x600" "640x480" 
"720x400"      
        EndSubSection
        SubSection "Display"
                Depth           15
                Modes           "1024x768" "832x624" "800x600" "640x480" 
"720x400"      
        EndSubSection
        SubSection "Display"
                Depth           16
                Modes           "1024x768" "832x624" "800x600" "640x480" 
"720x400"      
        EndSubSection
        SubSection "Display"
                Depth           24
                Modes           "1024x768" "832x624" "800x600" "640x480" 
"720x400"      
        EndSubSection
EndSection

Évidemment, si tu veux pouvoir accéder à une résolution supérieure à 1024x768, 
il te faudra rajouter les modes "1280x1024" et "1152x870".

Bon courage !

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