Grub configuration options

[techAdmin]

I've run into this problem a few times now, grub uses the wrong vga mode to boot up, resulting in an error on boot, well, not an error, but a pause.

This brief outline gives some of the options available:

:: Quote ::

Here's a table showing frame buffer vga modes:

:: Code ::

Color depth      | 640x480  800x600  1024x768 1280x1024
-----------------+-------------------------------------
256        (8bit)|  769      771       773      775
32000     (15bit)|  784      787       790      793
65000     (16bit)|  785      788       791      794
16.7 Mill.(24bit)|  786      789       792      795

The vga= setting only effects the frame buffer, not X (unless you're using the fbdev driver in X). This'll mean that your console will display at this resolution.

Changes to the X resolution can be made in /etc/X11/XF86Config-4.

savedefault is used to make the default boot option the one last selected. e.g. you select "Windows" when booting, on the next boot "Windows" will be the default.

The hexidecimal version is this:

:: Code ::

791=0x317

    | 640x480  800x600  1024x768 1280x1024
----+-------------------------------------
256 |  0x301    0x303    0x305    0x307   
32k |  0x310    0x313    0x316    0x319   
64k |  0x311    0x314    0x317    0x31A   
16M |  0x312    0x315    0x318    0x31B