Changing screen resolution at boot time on Debian Linux

My screen resolution does not work at boot time. Some text on the left of the screen cannot be displayed when the machine starts.

To get the correct screen resolution, I do these things:

$ nano /etc/default/grub

Modify the line below:

GRUB_CMDLINE_LINUX="video=800x600"



Use Ctrl + x to save the file.

$ update-grub


Restart the machine. I can see the missing text now.

Reference:

http://www.fclose.com/b/linux/2218/configuration-of-linux-kernel-video-mode/