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-Tridentfb is a framebuffer driver for some Trident chip based cards.
-The following list of chips is thought to be supported although not all are
-those from the TGUI series 9440/96XX and with Cyber in their names
-those from the Image series and with Cyber in their names
-those with Blade in their names (Blade3D,CyberBlade...)
-the newer CyberBladeXP family
-All families are accelerated. Only PCI/AGP based cards are supported,
-none of the older Tridents.
-The driver supports 8, 16 and 32 bits per pixel depths.
-The TGUI family requires a line length to be power of 2 if acceleration
-is enabled. This means that range of possible resolutions and bpp is
-limited comparing to the range if acceleration is disabled (see list
-of parameters below).
-Known bugs:
-1. The driver randomly locks up on 3DImage975 chip with acceleration
- enabled. The same happens in X11 (Xorg).
-2. The ramdac speeds require some more fine tuning. It is possible to
- switch resolution which the chip does not support at some depths for
- older chips.
-How to use it?
-When booting you can pass the video parameter.
-The parameters for tridentfb are concatenated with a ':' as in this example.
-The second level parameters that tridentfb understands are:
-noaccel - turns off acceleration (when it doesn't work for your card)
-fp - use flat panel related stuff
-crt - assume monitor is present instead of fp
-center - for flat panels and resolutions smaller than native size center the
- image, otherwise use
-memsize - integer value in KB, use if your card's memory size is misdetected.
- look at the driver output to see what it says when initializing.
-memdiff - integer value in KB, should be nonzero if your card reports
- more memory than it actually has. For instance mine is 192K less than
- detection says in all three BIOS selectable situations 2M, 4M, 8M.
- Only use if your video memory is taken from main memory hence of
- configurable size. Otherwise use memsize.
- If in some modes which barely fit the memory you see garbage
- at the bottom this might help by not letting change to that mode
- anymore.
-nativex - the width in pixels of the flat panel.If you know it (usually 1024
- 800 or 1280) and it is not what the driver seems to detect use it.
-bpp - bits per pixel (8,16 or 32)
-mode - a mode name like 800x600-8@75 as described in
- Documentation/fb/modedb.txt
-Using insane values for the above parameters will probably result in driver
-misbehaviour so take care(for instance memsize=12345678 or memdiff=23784 or