在虚拟机上安装 RedHat Linux AS4.0 后, 视频配置时选择颜色深度太高,把 16 位色配置为 24 位色,导致打开图形界面时出现花屏,屏幕宽度非常大,严重变形,不能操作.
既然是显卡配置部分出现问题,就 修改该部分的配置信息.在这种情况下,这些应该进入单用户模式下完成：
 重新启动机器,在出现 grub 后,按字母“e”,然后会出现 grub 的配置文件,再按键盘移动光标到第二行“Kernal……”,再按“e”,然后在编辑界面输入 single,回车.然后按“b”重启,就进入了“单用户模式”.
进入后在提示符 # 后敲入：vi /etc/X11/xorg.conf,然后会打开这个视频配置文件,再输入“/Screen”(注意S是大写)检索到 Screen 部分,会显示相关的配置的地方.
然后您按“i”键进入Vi编辑器的插入模式,把光标移动到“24”的位置,把这里的 24 改为 16,然后按 ESC 键返回命令模式,按冒号“:”,输入 wq,回车,保存、退出.键入 reboot 命令,回车,重新启动,图形界面就出来了！
以下是一个正确的 xorg.conf 文件的内容：
# XFree86 4 configuration created by pyxf86config
Section “ServerLayout”
Identifier “Default Layout”
Screen 0 “Screen0″ 0 0
InputDevice “Mouse0″ “CorePointer”
InputDevice “Keyboard0″ “CoreKeyboard”
EndSection
Section “Files”
# RgbPath is the location of the RGB database. Note, this is the name of the
# file minus the extension (like “.txt” or “.db”). There is normally
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# no need to change the default.
# Multiple FontPath entries are allowed (they are concatenated together)
# By default, Red Hat 6.0 and later now use a font server independent of
# the X server to render fonts.
RgbPath “/usr/X11R6/lib/X11/rgb”
FontPath “unix/:7100″
EndSection
Section “Module”
Load “dbe”
Load “extmod”
Load “fbdevhw”
Load “glx”
Load “record”
Load “freetype”
Load “type1″
Load “dri”
EndSection
Section “InputDevice”
# Specify which keyboard LEDs can be user-controlled (eg, with xset(1))
# Option ”Xleds” ”1 2 3″
# To disable the XKEYBOARD extension, uncomment XkbDisable.
# Option ”XkbDisable”
# To customise the XKB settings to suit your keyboard, modify the
# lines below (which are the defaults). For example, for a non-U.S.
# keyboard, you will probably want to use:
# Option ”XkbModel” ”pc102″
# If you have a US Microsoft Natural keyboard, you can use:
# Option ”XkbModel” ”microsoft”
#
# Then to change the language, change the Layout setting.
# For example, a german layout can be obtained with:
# Option ”X |
