UbuntuHelp:ChangeTTYResolution

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https://help.ubuntu.com/community/ChangeTTYResolution

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This is a comprehensive HOWTO to change your TTY (Ctrl+Alt+F1) and bootscreen resolution.

Introduction

I am sure we have all noticed the low resolution used while Ubuntu is booting up, and also of the TTY (Ctrl+Alt+F1). This could be changed back in 5.10 before the install, but in 6.06 it always defaults to 640x480. For most of us, this isn't so bad, but for those of us using LCDs a resolution other than the LCD's native resolution creates kind of blurry graphics and text because the pixels don't line up with the LCDs. 640x480 is also a little crammed for the TTY, especially when viewing large pieces of data.

HOWTO

The resolution of the TTY is set as a parameter given to the kernel before it loads. GRUB is responsible for booting the kernel, so we need to tell GRUB to tell the kernel what resolution we want. GRUB's list of boot options is contained in the file /boot/grub/menu.lst.

• Open up the Terminal by going to Applications -> Accessories -> Terminal
• Before you open up the file we should back it up. If you haven't tinkered with Gedit as root before Gedit will make a backup file menu.lst~ before it saves, but if you want you can do it yourself to make sure. Just type in the terminal:

sudo cp /boot/grub/menu.lst /boot/grub/menu.lst~ 

Enter your password when prompted. This will backup the file as menu.lst~.

• Now we open it up with:

 gksudo gedit /boot/grub/menu.lst 

• Look for the line (or first instance of the line):

 kernel		/boot/vmlinuz-2.6.15-25-686 root=/dev/sda2 ro quiet splash 

where 686 is your CPU architecture such as 386, AMD64 or PPC, and /dev/sda2 is your hard drive partition such as /dev/hda1.

• This is the command for your kernel, and we need to append a parameter to tell the kernel to boot into a certain resolution. This is done with the vga= flag, along with a special number for your desired screen resolution and color depth.

Refer to the following table to see what your resolution's number is:

	640x480	800x600	1024x768	1152x864	1280x1024	1600x1200
8bit	769	771	773	353	775	777
15bit	784	787	790		793	796
16bit	785	788	791	355	794	797
24bit	786	789	792		795	798

You will most likely want the 24bit color depth (AKA "True Color") (choose this if you are not sure) along with a decent resolution such as 1024x768 or 1280x1024. I, for example, want 24bit with 1280x1024 so I choose 795, and will append vga=795 to the line, giving me:

kernel		/boot/vmlinuz-2.6.15-25-686 root=/dev/sda2 ro quiet splash vga=795 

Go ahead and append vga= to the kernel line in menu.lst along with your screen resolution number form the table above, as in the example.

• Save the file. (If you can't save the file you haven't opened it as root, go back and execute gksudo gedit /boot/grub/menu.lst providing your password.)
• Restart your computer.
• If your computer dies on boot, get into recovery mode and replace the menu.lst file with the backup one with:

sudo cp /boot/grub/menu.lst~ /boot/grub/menu.lst 

Then make a post in the forums to investigate why it didn't work!

FOR 9.10 KARMIC KOALA AND LATER

Karmic Koala has switched to GRUB 2, and now the settings can be found in the file /etc/default/grub

• Open it with your text editor with root privilege. Find the line:

GRUB_CMDLINE_LINUX="" 

• Edit the line by writing the preferred resolution-depth number from the table above in "" as vga=xxx replacing xxx with the number. Following the example above it should be like this:

GRUB_CMDLINE_LINUX="vga=795" 

• Save the file and exit. (If you can't save the file you haven't opened it as root, go back and execute gksudo gedit /etc/default/grub providing your password.)
• Execute the command

sudo update-grub 

• Restart your computer.

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