debian超出工作频率范围90.0khz/60hz

恕我愚钝，我修改过xorg.conf,但不成功，望各位多多指点！

我的显示器LG W1942SP 最佳分辨率 1440 x 900 水平刷新率(kHz) 30 ~ 83 垂直刷新率(Hz) 56 ~ 75 色数(M) 16.7

以下是我的xorg.conf原文件内容 # xorg.conf (X.Org X Window System server configuration file) # # This file was generated by dexconf, the Debian X Configuration tool, using # values from the debconf database. # # Edit this file with caution, and see the xorg.conf manual page. # (Type "man xorg.conf" at the shell prompt.) # # This file is automatically updated on xserver-xorg package upgrades *only* # if it has not been modified since the last upgrade of the xserver-xorg # package. # # If you have edited this file but would like it to be automatically updated # again, run the following command: # sudo dpkg-reconfigure -phigh xserver-xorg

Section "InputDevice" Identifier "Generic Keyboard" Driver "kbd" Option "XkbRules" "xorg" Option "XkbModel" "pc104" Option "XkbLayout" "us" EndSection

Section "InputDevice" Identifier "Configured Mouse" Driver "mouse" EndSection

Section "Device" Identifier "Configured Video Device" EndSection

Section "Monitor" Identifier "Configured Monitor" EndSection

Section "Screen" Identifier "Default Screen" Monitor "Configured Monitor" EndSection