Today, when a Dell old CentOS6.5 server was tuned in, the monitor found that the screen was completely tilted and the font was not clear at all.
Solution: Change the screen of the display can be (IDC room is generally available ha).
Online Check the information, find several solutions, paste:
for CentOS OS 6.5 or 6.5 the previous version :
Enter the optical drive system boot system installation interface, the following failure occurred
The first type: the server directly connected to the widescreen display, the screen will appear tilted state;
The second type: through Remote control card access server installed operating system, the screen will appear beyond the display range
WORKAROUND: Do not select the default installation option
Installor upgrade An existing system to install or upgrade existing systems
Select the second item: Install system with basic video driver The installation process with the base graphics driver
The problem will be solved. Or when the installation starts, adding "vga=711″ parameters can also solve this problem
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for Centos7 version :
Workaround:
when the installation starts, add the Nomodeset parameter.
If you are already installed, you can modify the Vi/etc/sysconfig/grub,
Add the nomodeset parameter: Add the Nomodeset parameter at the end of the Grub_cmdline_linux line. For example I have the following:
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then execute:grub2-mkconfig-o/boot/grub2/grub.cfg
CentOS Connect monitor causes screen display to tilt