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| -rw-r--r-- | Documentation/fb/tridentfb.rst (renamed from Documentation/fb/tridentfb.txt) | 36 |
1 files changed, 22 insertions, 14 deletions
diff --git a/Documentation/fb/tridentfb.txt b/Documentation/fb/tridentfb.rst index 45d9de5b13a3..7921c9dee78c 100644 --- a/Documentation/fb/tridentfb.txt +++ b/Documentation/fb/tridentfb.rst @@ -1,3 +1,7 @@ +========= +Tridentfb +========= + 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 @@ -17,6 +21,7 @@ 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 @@ -26,28 +31,30 @@ Known bugs: How to use it? ============== -When booting you can pass the video parameter. -video=tridentfb +When booting you can pass the video parameter:: + + video=tridentfb -The parameters for tridentfb are concatenated with a ':' as in this example. +The parameters for tridentfb are concatenated with a ':' as in this example:: -video=tridentfb:800x600-16@75,noaccel + 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) +======== ===================================================================== +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 +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 +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. +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 +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 @@ -56,12 +63,13 @@ memdiff - integer value in KB, should be nonzero if your card reports 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 +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 +bpp bits per pixel (8,16 or 32) +mode a mode name like 800x600-8@75 as described in + Documentation/fb/modedb.rst +======== ===================================================================== Using insane values for the above parameters will probably result in driver misbehaviour so take care(for instance memsize=12345678 or memdiff=23784 or |