How to change the screen refresh frequency in LINUX

How to change the screen refresh frequency in LINUX-general Linux technology-Linux technology and application information. The following is a detailed description. I installed red hat. How can I modify the screen refresh frequency?
Several feasible methods
1. Install the nvidia or ati graphics card driver first.
2. Run it on the console.
# Xvidtune
There will be a graphical tool for setting the display, use the left and right buttons to adjust the screen position, test, adjust to the display in the middle, and then show, write down the line of output displayed in the terminal window. A statement similar to this is displayed in the editor with a mouse on the console.
"1024x768" 94.50 1024 1088 1184 1376 768 769 772 + hsync + vsync
Edit the/etc/X11/XF86config file.
Find the current resolution Section in Section "Monitor" and you will see
ModeLine "1024x480" 65.00 1024 1032 1176 1344 480 488-hsync-vsync
Add a "#" sign in front of this sentence, unregister it, And then paste the post you tested in the editor that I mentioned above, post in front of the sentence where we add #, but add a ModeLine as follows. There must be a space behind ModeLine;
ModeLine "1024x768" 94.50 1024 1088 1184 1376 768 769 772 + hsync + vsync
Restart the XWIN server to see the effect.
3. Run the command setup on the Character interface console. After the menu is displayed, there is an XConfig. The resolution is generally used in windows and linux.
4. After XFree86 4.3 (Redhat 9.0), there is a command that can instantly modify the screen refresh frequency and resolution. This command is xrandroid. Usage:
This command must be executed under X.
Execute xrandroid to check the resolution and refresh frequency supported by your monitor,
Use the-q option of xrandroid:
Xrandroid-q
A list is provided. To use one of the modes, you only need to use the-s option of xrandroid:
Xrandroid-s n
Here, n is the number at the beginning of the corresponding mode row in the xrandroid-q List.
Then use
Xrandroid-s x-r
For example, in xrandroid-s 1024x768-r 84, the resolution is set to 1024x768, And the refresh frequency is 84 (unlike windows, windows may be 85 ). Before using xrandroid, remember to use xrandroid to check the refresh frequency supported.