Documentation/fb/tridentfb.txt - kernel/common - Git at Google

 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
 tested:

 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.
 video=tridentfb

 The parameters for tridentfb are concatenated with a ':' as in this example.

 video=tridentfb:800x600-16@75,noaccel

 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
 stretch

 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
 nativex=93)

 Contact: [email protected]
	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
	tested:

	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.
	video=tridentfb

	The parameters for tridentfb are concatenated with a ':' as in this example.

	video=tridentfb:800x600-16@75,noaccel

	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
	stretch

	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
	nativex=93)

	Contact: [email protected]