Where did my penguins go?

Bill Davidsen davidsen at tmr.com
Thu Dec 31 01:54:52 UTC 2009


g wrote:
> Richard Shaw wrote:
> 
>> try adding a VESA mode, something like "vga=..." I'm not
>> sure what resolution you want to run but try "vga=ask" the first time
>> and pick the one you like the most. If you're happy with it change the
>> parameter to "vga=0x<mode>". I found out the hard way that you need to
>> put "0x" on the front of whichever mode you choose.
> 
> either a hex value or a decimal value may be passed.
> 
> "0x" is used if you pass a hex value, else value passed will be taken as
> being a decimal value.
> 
It's not *quite* that simple, that the way it works on the command line passed 
to the kernel. However, if you use VGA=ask, those numbers are hex and 0x is 
neither needed nor accepted.Ste 300
> 
> some basic resolution codes, in decimal, are:
> 
> colors  bits  640x480  800×600  1024×768  1152×864 1280×1024  1600×1200
>    256    8   vga=769  vga=771   vga=773   vga=353   vga=775    vga=796
>   32K0        vga=784  vga=787   vga=790   vga=354   vga=793    vga=797
>   65K0   16   vga=785  vga=788   vga=791   vga=355   vga=794    vga=798
>   16M7   24   vga=786  vga=789   vga=792   vga=795   vga=799
> 
> 
> this page has charts for passing hex values with a few decimal thrown in;
> 
>    http://wiki.antlinux.com/pmwiki.php?n=HowTos.VgaModes
> 
> 
> if you have "kernel source package" installed, you should find info in;
> 
>   /usr/src/linux/Documentation/fb/vesafb.txt
> 
In addition, with recent kernels, you have to start doing anything interesting 
with "nomodeset" before you can use vga= or it's useful friends video= and xdriver=

Example of everything all at once, use vesa and see penguins:
   nomodeset vga=0x318 video=vesafb xdriver=vesa

This allows you to use alternate framebuffer and X drivers, and trade the high 
performance and low reliability of some modern kernel drivers for the slow 
stability of vesa.

-- 
Bill Davidsen <davidsen at tmr.com>
   "We have more to fear from the bungling of the incompetent than from
the machinations of the wicked."  - from Slashdot





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