Redhat modify screen resolution

Redhat changes the screen resolution about Redhat changes the screen resolution. my monitor is LCD and you can directly tune it in Xwindow (enter setup in the terminal ), however, after the cancellation is called out, it always looks like a square in the center of the screen. Later, I saw the following configuration items on the Internet...
Redhat changes the screen resolution about Redhat changes the screen resolution experience my monitor is LCD, directly tune in X window (enter setup in the terminal ), however, after the cancellation is called out, it always looks like a square in the center of the screen. Later, I saw the following change to the configuration file: (/etc/X11/XF86config, most of which is this file, but redhat 5 is xorg. conf file: www.2cto.com Section "Monitor" Identifier "Monitor0" VendorName "Monitor Vendor" ModelName "untested display" HorizSync 31.5-37.9 VertRefresh 50.0-70.0 Option "dpms" EndSection changed to Section "Monitor" identifier "Monitor0" VendorName "Monitor Vendor" ModelName "undetected Monitor" HorizSync 31.5-60.0 VertRefresh 50.0-80.0 Option" Dpms "EndSection www.2cto.com sets Section" Screen "Identifier" Screen0 "Device" Videocard0 "Monitor" Monitor0 "DefaultDepth 24 SubSection" Display "Depth 24 Modes" 800x600 "" 640x480" endSubSectionEndSection is changed to Section "Screen" Identifier "Screen0" Device "Videocard0" Monitor "Monitor0" DefaultDepth 16 SubSection "Display" Depth 16 Modes "1024x768" EndSubSectionEndSection, and save, exit and. Www.2cto.com changed the/etc/X11/XF86config file according to the above method, and the screen became larger after cancellation. However, you do not need to delete the "800x600" "640xlarge" after Modes under section screen. you only need to add "1280x1024" in front of the Modes. In addition, two problems were found during the modification process: one is about depth, that is, the color depth. I checked the information that depth indicates the color bit, which is 24 bits, or 16-bit. I first modified it to 16 bits according to the above article, and then tried to change it to 24 bits, and found that the display was better. The other is about HorizSync and VertRefresh, that is, horizontal and vertical resolutions. After being adjusted as described in the article, the screen width does not seem to be enough. I adjusted the upper limit of the horizontal resolution to 64 and saved it. After I deregistered it, the screen displayed normally. I want to estimate that the horizontal resolution can adjust the screen width, while the vertical resolution can adjust the screen length.