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If you have large size (21″) or small size (14″) monitor, it is better to use large/small character size. But how do you setup character size in runlevel 3 under Linux?

The answer is simple, use the kernel framebuffer. It allows you to set the Linux text screen (console) to higher or lower resolution. The Linux framebuffer (fbdev) is a graphic hardware-independent abstraction layer to show graphics on a console without relying on system-specific libraries such as SVGALib or the heavy overhead of the X Window System.

Open GRUB configuration file grub.conf

vi grub.conf

Append line vga=0×318 (a 24-bit color depth @ 1024×768 display) to kernel line. At the end your modification should look like as follows:

title Enterprise Linux-base (2.6.18-92.el5)       root (hd0,0)
kernel /vmlinuz-2.6.18-92.el5 ro root=LABEL=/ rhgb quiet vga=0×318
initrd /initrd-2.6.18-92.el5.img

Save and close the file. Reboot the system:

telinit 6

0×318 (hex) is a mode. Here are common modes:

See kernel docs - Documentation/i386/boot.txt and Documentation/svga.txt files for more information. You can also pass special parameter called ask i.e. vga=ask for menu.

Please note that not all video cards out there support kernel framebuffer mode. Also you may need to to use special driver.

References:

• 10 boot time parameters you should know about the Linux kernel
• Framebuffer HOWTO

1. KENNY said...
   2:17 pm - September 6th, 2010

   
   

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