Saturday, November 14, 2009

[QnA] FrameBuffer setting

Several months ago, I learned the way to view images in the virtual console. I happened to recall the framebuffer and want to know more about it, so I began to search related information again.

Here are several informative web pages:
  1. Images and Videos on the Command Line? YES!
  2. Using framebuffer devices on Intel platforms
  3. Ubuntu wiki: FrameBuffer
In the 2nd web page, there is a table showing the values for different resolution as follows:

Colours 640x400 640x480 800x600 1024x768 1152x864 1280x1024 1600x1200
4 bits | ? ? 0x302 ? ? ? ?
8 bits | 0x300 0x301 0x303 0x305 0x161 0x307 0x31C
15 bits | ? 0x310 0x313 0x316 0x162 0x319 0x31D
16 bits | ? 0x311 0x314 0x317 0x163 0x31A 0x31E
24 bits | ? 0x312 0x315 0x318 ? 0x31B 0x31F
32 bits | ? ? ? ? 0x164 ?
Furthermore, from the 3rd reference I found more useful setting such as
  • ``vga=normal'', or ``nofb'', disables the framebuffer
  • ``vga=ask'' will able you to set a value at each boot good for testing out the various modes.

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