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@@ -0,0 +1,91 @@ + +What works: +- Supports 8bpp, 15/16bpp, 24bpp and 32bpp. Heavy testing on ViRGE DX. +- There is some known instability in ViRGE GX2, please report problems. +- Silken Mouse is enabled by default, use the generic server option of + -nosilk to disable it. + +XCONFIG options: + +The driver supports quite a few different XConfig options, which can +be used to tune the driver and improve performance. Without any options, +the driver will use conservative settings which should work on most +hardware. Large improvements in performance are possible by selecting +the proper options, which will probably work on most systems. + +Cursor: + +- "hwcursor" "off" behaves exactly like "swcursor". Default: "on" +- "swcursor" will disable the HW Cursor. HW Cursor is used by default and + no option is needed to enable it. + +Display: +- "ShadowFB" Use shadow framebuffer. Disables HW acceleration. Default: off. +- "Rotate" " cw "|" ccw " Rotate the screen CW - clockwise or CCW - counter + clockwise. Disables HW Acceleration and HW Cursor, uses ShadowFB. + Default: no rotation. +- "XVideo" Disable XVideo support by using the off option. This changes FIFO + settings which prevent screen noise for high-res modes. Default: on + +Video memory: + +- "slow_edodram" will switch the standard ViRGE to 2-cycle edo mode. Try this + if you encounter pixel corruption on the ViRGE. Using this option will + cause a large decrease in performance. +- "fpm_vram" will switch the ViRGE/VX to fast page mode vram mode +- "slow_dram " | " fast_dram" Change Trio 3D and 3D/2X memory options. + Default: Use BIOS defaults. +- "early_ras_precharge", "late_ras_precharge" adjust memory parameters. One + of these will us the same settings as your video card defaults, and + using neither in the config file does the same. +- "set_mclk" sets the memory clock, format is: + Option "set_mclk" "50000" + in the XF86Config file. Valid values are any + integer <= 100000, where 100000 == 100 MHz. +- "set_refclk" sets the ref clock for ViRGE MX, format is: + Option "set_refclk" "50000" + +Acceleration and graphic engine: + +- "NoAccel" turns off all acceleration +- "fifo_aggressive", "fifo_moderate" and "fifo_conservative" alter the settings + for the threshold at which the pixel FIFO takes over the internal + memory bus to refill itself. The smaller this threshold, the better + the acceleration performance of the card. You may try the fastest + setting ("aggressive") and move down if you encounter pixel corruption. + The optimal setting will probably depend on dot-clock and on color + depth. Note that specifying any of these options will also alter other + memory settings which should increase performance, so you should at + least use "fifo_conservative" (this uses the chip defaults). +- Common XAA acceleration options to disable primitives for test purposes: + "XaaNoScreenToScreenCopy" + "XaaNoSolidFillRect" + "XaaNoColor8x8PatternFillRect" + "XaaNoImageWriteRect" + "XaaNoPixmapCache" + +PCI bus: +- "pci_burst" will enable PCI burst mode. This should work on all but a + few "broken" PCI chipsets, and will increase performance. Option may + take a parameter "on", "off", "yes", etc... +- "pci_retry" will allow the driver to rely on PCI Retry to program the + ViRGE registers. "pci_burst" must be enabled for this to work. + This will increase performance, especially for small fills/blits, + because the driver does not have to poll the ViRGE before sending it + commands to make sure it is ready. It should work on most + recent PCI chipsets. + +ViRGE MX LCD options: +- "lcd_center" +- "set_lcdclk" allows setting the clock for a ViRGE MX LCD display. Format is: + Option "set_lcdclk" "30000" + in the config file. Valid values are ? + +Debug: +- "ShowCache" Enable or disable viewing offscreen cache memory. A + development debug option. Default: off. +- "mx_cr3a_fix" Enable or disable a cr3a fix added for ViRGE MX. + Default: on. + + +$XFree86: xc/programs/Xserver/hw/xfree86/drivers/s3virge/README,v 1.9 2000/06/14 21:57:54 dawes Exp $ |