linux/Documentation/fb/tridentfb.txt
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   1Tridentfb is a framebuffer driver for some Trident chip based cards.
   2
   3The following list of chips is thought to be supported although not all are
   4tested:
   5
   6those from the TGUI series 9440/96XX and with Cyber in their names
   7those from the Image series and with Cyber in their names
   8those with Blade in their names (Blade3D,CyberBlade...)
   9the newer CyberBladeXP family
  10
  11All families are accelerated. Only PCI/AGP based cards are supported,
  12none of the older Tridents.
  13The driver supports 8, 16 and 32 bits per pixel depths.
  14The TGUI family requires a line length to be power of 2 if acceleration
  15is enabled. This means that range of possible resolutions and bpp is
  16limited comparing to the range if acceleration is disabled (see list
  17of parameters below).
  18
  19Known bugs:
  201. The driver randomly locks up on 3DImage975 chip with acceleration
  21   enabled. The same happens in X11 (Xorg).
  222. The ramdac speeds require some more fine tuning. It is possible to
  23   switch resolution which the chip does not support at some depths for
  24   older chips.
  25
  26How to use it?
  27==============
  28
  29When booting you can pass the video parameter.
  30video=tridentfb
  31
  32The parameters for tridentfb are concatenated with a ':' as in this example.
  33
  34video=tridentfb:800x600-16@75,noaccel
  35
  36The second level parameters that tridentfb understands are:
  37
  38noaccel - turns off acceleration (when it doesn't work for your card)
  39
  40fp      - use flat panel related stuff
  41crt     - assume monitor is present instead of fp
  42
  43center  - for flat panels and resolutions smaller than native size center the
  44          image, otherwise use
  45stretch
  46
  47memsize - integer value in KB, use if your card's memory size is misdetected.
  48          look at the driver output to see what it says when initializing.
  49
  50memdiff - integer value in KB, should be nonzero if your card reports
  51          more memory than it actually has. For instance mine is 192K less than
  52          detection says in all three BIOS selectable situations 2M, 4M, 8M.
  53          Only use if your video memory is taken from main memory hence of
  54          configurable size. Otherwise use memsize.
  55          If in some modes which barely fit the memory you see garbage
  56          at the bottom this might help by not letting change to that mode
  57          anymore.
  58
  59nativex - the width in pixels of the flat panel.If you know it (usually 1024
  60          800 or 1280) and it is not what the driver seems to detect use it.
  61
  62bpp     - bits per pixel (8,16 or 32)
  63mode    - a mode name like 800x600-8@75 as described in
  64          Documentation/fb/modedb.txt
  65
  66Using insane values for the above parameters will probably result in driver
  67misbehaviour so take care(for instance memsize=12345678 or memdiff=23784 or
  68nativex=93)
  69
  70Contact: jani@astechnix.ro
  71
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