在虛擬機上安裝 RedHat Linux AS4.0 后,由於視頻配置時選擇顏色深度太高,把 16 位色配置為 24 位色,導致打開圖形界面時出現花屏,屏幕寬度非常大,嚴重變形,不能操作.
既然是顯卡配置部分出現問題,就必須修改該部分的配置信息.在這種情況下,這些應該進入單用戶模式下完成:
重新啟動機器,在出現 grub 后,按字母“e”,然後會出現 grub 的配置文件,再按鍵盤移動游標到第二行“Kernal……”,再按“e”,然後在編輯界面輸入 single,回車.然後按“b”重啟,就進入了“單用戶模式”.
進入后在提示符 # 后敲入:vi /etc/X11/xorg.conf,然後會打開這個視頻配置文件,再輸入“/Screen”(注意S是大寫)檢索到 Screen 部分,會顯示相關的配置的地方.
然後您按“i”鍵進入Vi編輯器的插入模式,把游標移動到“24”的位置,把這裡的 24 改為 16,然後按 ESC 鍵返回命令模式,按冒號“:”,輸入 wq,回車,保存、退出.鍵入 reboot 命令,回車,重新啟動,圖形界面就出來了!
以下是一個正確的 xorg.conf 文件的內容:
# 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
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 ”XkbLayout” ”de”
# or:
# Option ”XkbLayout” ”de”
# Option ”XkbVariant” ”nodeadkeys”
#
# If you’d like to switch the positions of your capslock and
# control keys, use:
# Option ”XkbOptions” ”ctrl:swapcaps”
Section “InputDevice”
Identifier “Mouse0″
Driver “mouse”
Option “Protocol” “IMPS/2″
Option “Device” “/dev/input/mice”
Option “ZAxisMapping” “4 5″
Option “Emulate3Buttons” “yes”
EndSection
Section “Monitor”
Identifier “Monitor0″
VendorName “Monitor Vendor”
ModelName “Unknown monitor”
HorizSync 31.5 - 37.9
VertRefresh 50.0 - 70.0
Option “dpms”
EndSection
Section “Device”
Identifier “Videocard0″
Driver “s3″
VendorName “Videocard vendor”
BoardName “S3 Trio64 (generic)”
EndSection
Section “Screen”
Identifier “Screen0″
Device “Videocard0″
Monitor “Monitor0″
DefaultDepth 16
SubSection “Display”
Viewport 0 0
Depth 16
Modes “800×600″ “640×480″
EndSubSection
SubSection “Display”
Viewport 0 0
Depth 16
Modes “800×600″ “640×480″
Section “DRI”
Group 0
Mode 0666
EndSection
注意以上的 Section “Screen”……EndSection 部分,正是我們需要關心的地方.在實際中筆者發現,DefaultDepth 16 莫名其妙的變為了 DefaultDepth 16161616161616161616.SubSection “Display” 部分的兩個 16 都變為了 24,需要全部變回來.這裡表明是有 2 個顯示器的情況.
筆者對照 Redhat Linux 9.0 的情況,發現視頻配置文件不是 /etc/X11/xorg.conf,而是 /etc/X11/XF86Config(注意文件名的大小寫),這個大家必須注意.XF86Config 的 Section “Screen”……EndSection部分也不同,如下所示,應該和機器的硬體配置有關係:
Section “Screen”
Identifier “Screen0″
Device “Videocard0″
Monitor “Monitor0″
DefaultDepth 16
SubSection “Display”
Depth 16
Modes “800×600″ “640×480″
EndSubSection
EndSection
*RedHat Linux AS4.0 即:RedHat Linux Enterprise Advanced Server 4.0 版.
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