/etc/X11/xorg.conf 에 다음 내용을 추가 Section “Monitor” ### Comment all HorizSync and VertSync values to use DDC:     Identifier     “Monitor0”     VendorName     “Unknown”     ModelName      “Unknown”     HorizSync       28.0 – 33.0     VertRefresh     43.0 – 72.0     Option         “DPMS” EndSection Section “Device”     Identifier     “Videocard0”     Driver         “nvidia” EndSection Section “Screen”     Identifier     “Screen0”