linux/Documentation/fb/s3fb.txt
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   2        s3fb - fbdev driver for S3 Trio/Virge chips
   3        ===========================================
   4
   5
   6Supported Hardware
   7==================
   8
   9        S3 Trio32
  10        S3 Trio64 (and variants V+, UV+, V2/DX, V2/GX)
  11        S3 Virge  (and variants VX, DX, GX and GX2+)
  12        S3 Plato/PX             (completely untested)
  13        S3 Aurora64V+           (completely untested)
  14
  15        - only PCI bus supported
  16        - only BIOS initialized VGA devices supported
  17        - probably not working on big endian
  18
  19I tested s3fb on Trio64 (plain, V+ and V2/DX) and Virge (plain, VX, DX),
  20all on i386.
  21
  22
  23Supported Features
  24==================
  25
  26        *  4 bpp pseudocolor modes (with 18bit palette, two variants)
  27        *  8 bpp pseudocolor mode (with 18bit palette)
  28        * 16 bpp truecolor modes (RGB 555 and RGB 565)
  29        * 24 bpp truecolor mode (RGB 888) on (only on Virge VX)
  30        * 32 bpp truecolor mode (RGB 888) on (not on Virge VX)
  31        * text mode (activated by bpp = 0)
  32        * interlaced mode variant (not available in text mode)
  33        * doublescan mode variant (not available in text mode)
  34        * panning in both directions
  35        * suspend/resume support
  36        * DPMS support
  37
  38Text mode is supported even in higher resolutions, but there is limitation to
  39lower pixclocks (maximum usually between 50-60 MHz, depending on specific
  40hardware, i get best results from plain S3 Trio32 card - about 75 MHz). This
  41limitation is not enforced by driver. Text mode supports 8bit wide fonts only
  42(hardware limitation) and 16bit tall fonts (driver limitation). Text mode
  43support is broken on S3 Trio64 V2/DX.
  44
  45There are two 4 bpp modes. First mode (selected if nonstd == 0) is mode with
  46packed pixels, high nibble first. Second mode (selected if nonstd == 1) is mode
  47with interleaved planes (1 byte interleave), MSB first. Both modes support
  488bit wide fonts only (driver limitation).
  49
  50Suspend/resume works on systems that initialize video card during resume and
  51if device is active (for example used by fbcon).
  52
  53
  54Missing Features
  55================
  56(alias TODO list)
  57
  58        * secondary (not initialized by BIOS) device support
  59        * big endian support
  60        * Zorro bus support
  61        * MMIO support
  62        * 24 bpp mode support on more cards
  63        * support for fontwidths != 8 in 4 bpp modes
  64        * support for fontheight != 16 in text mode
  65        * composite and external sync (is anyone able to test this?)
  66        * hardware cursor
  67        * video overlay support
  68        * vsync synchronization
  69        * feature connector support
  70        * acceleration support (8514-like 2D, Virge 3D, busmaster transfers)
  71        * better values for some magic registers (performance issues)
  72
  73
  74Known bugs
  75==========
  76
  77        * cursor disable in text mode doesn't work
  78        * text mode broken on S3 Trio64 V2/DX
  79
  80
  81--
  82Ondrej Zajicek <santiago@crfreenet.org>
  83
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