Documentation/fb/gxfb.rst

   1 =============
   2 What is gxfb?
   3 =============
   4
   5 .. [This file is cloned from VesaFB/aty128fb]
   6
   7 This is a graphics framebuffer driver for AMD Geode GX2 based processors.
   8
   9 Advantages:
  10
  11  * No need to use AMD's VSA code (or other VESA emulation layer) in the
  12    BIOS.
  13  * It provides a nice large console (128 cols + 48 lines with 1024x768)
  14    without using tiny, unreadable fonts.
  15  * You can run XF68_FBDev on top of /dev/fb0
  16  * Most important: boot logo :-)
  17
  18 Disadvantages:
  19
  20  * graphic mode is slower than text mode...
  21
  22
  23 How to use it?
  24 ==============
  25
  26 Switching modes is done using  gxfb.mode_option=<resolution>... boot
  27 parameter or using `fbset` program.
  28
  29 See Documentation/fb/modedb.rst for more information on modedb
  30 resolutions.
  31
  32
  33 X11
  34 ===
  35
  36 XF68_FBDev should generally work fine, but it is non-accelerated.
  37
  38
  39 Configuration
  40 =============
  41
  42 You can pass kernel command line options to gxfb with gxfb.<option>.
  43 For example, gxfb.mode_option=800x600@75.
  44 Accepted options:
  45
  46 ================ ==================================================
  47 mode_option      specify the video mode.  Of the form
  48                  <x>x<y>[-<bpp>][@<refresh>]
  49 vram             size of video ram (normally auto-detected)
  50 vt_switch        enable vt switching during suspend/resume.  The vt
  51                  switch is slow, but harmless.
  52 ================ ==================================================
  53
  54 Andres Salomon <dilinger@debian.org>