The chipset will be automatically detected. The chipset name for this driver is "vgawonder". If you specify "ati" or "mach64" instead, any clocks specification in XF86Config will be ignored (which means the clocks will be probed). This is done to ensure you are aware that the clocks specification for previous versions of the driver is not supported by this version.
The clocks line to be specified in your XF86Config depends on what the board uses to generate dot clocks.
For all boards, one of the following clocks specifications (or an initial subset thereof) can be used depending on what the board uses to generate dot clocks:
Crystals (VGA Wonder V3 and V4 boards only):
Clocks 50.175 56.644 0.000 44.900 44.900 50.175 0.000 36.000
25.088 28.322 0.000 22.450 22.450 25.088 0.000 18.000
16.725 18.881 0.000 14.967 14.967 16.725 0.000 12.000
12.544 14.161 0.000 11.225 11.225 12.544 0.000 9.000
ATI 18810 clock generator:
Clocks 30.240 32.000 37.500 39.000 42.954 48.771 0.000 36.000
40.000 56.644 75.000 65.000 50.350 56.640 0.000 44.900
15.120 16.000 18.750 19.500 21.477 24.386 0.000 18.000
20.000 28.322 37.500 32.500 25.175 28.320 0.000 22.450
10.080 10.667 12.500 13.000 14.318 16.257 0.000 12.000
13.333 18.881 25.000 21.667 16.783 18.880 0.000 14.967
7.560 8.000 9.375 9.750 10.739 12.193 0.000 9.000
10.000 14.161 18.750 16.250 12.586 14.160 0.000 11.225
ATI 18811-0 and ATI 18812-0 clock generators:
Clocks 30.240 32.000 110.000 80.000 42.954 48.771 92.400 36.000
39.910 44.900 75.000 65.000 50.350 56.640 0.000 44.900
15.120 16.000 55.000 40.000 21.477 24.386 46.200 18.000
19.955 22.450 37.500 32.500 25.175 28.320 0.000 22.450
10.080 10.667 36.667 26.667 14.318 16.257 30.800 12.000
13.303 14.967 25.000 21.667 16.783 18.880 0.000 14.967
7.560 8.000 27.500 20.000 10.739 12.193 23.100 9.000
9.978 11.225 18.750 16.250 12.588 14.160 0.000 11.225
ATI 18811-1 and ATI 18811-2 clock generators:
Clocks 135.000 32.000 110.000 80.000 100.000 126.000 92.400 36.000
39.910 44.900 75.000 65.000 50.350 56.640 0.000 44.900
67.500 16.000 55.000 40.000 50.000 63.000 46.200 18.000
19.955 22.450 37.500 32.500 25.175 28.320 0.000 22.450
45.000 10.667 36.667 26.667 33.333 42.000 30.800 12.000
13.303 14.967 25.000 21.667 16.783 18.880 0.000 14.967
33.750 8.000 27.500 20.000 25.000 31.500 23.100 9.000
9.978 11.225 18.750 16.250 12.588 14.160 0.000 11.225
Mach32 and Mach64 owners should only specify up to the first 32 frequencies.
The possibilities for Mach64 boards also include the newer ATI 18818 clock generator chip. At bootup, video BIOS initialization can set up the 18818 to generate two slightly different sets of dot clocks. A way to duplicate this behaviour in the driver has not yet been found. In the meantime, one of the following clocks specification can be used:
ATI 18818 clock generator (primary BIOS setting):
Clocks 0.000 110.000 126.000 135.000 50.350 56.644 63.000 72.000
0.000 80.000 75.000 65.000 40.000 44.900 49.500 50.000
0.000 55.000 63.000 67.500 25.175 28.322 31.500 36.000
0.000 40.000 37.500 32.500 20.000 22.450 24.750 25.000
ATI 18818 clock generator (alternate BIOS setting):
Clocks 0.000 110.000 126.000 135.000 25.175 28.322 31.500 36.000
0.000 80.000 75.000 65.000 40.000 44.900 49.500 50.000
0.000 55.000 63.000 67.500 12.588 14.161 15.750 18.000
0.000 40.000 37.500 32.500 20.000 22.450 24.750 25.000
Other clock generators that have been used on ATI boards (which can all be said to be clones of one of the above) might generate non-zero frequencies for those that are zero above, or vice-versa.
The order of the clocks *is* very important. Mach32 and Mach64 owners should note that this order is different than what they would use for the accelerated servers.
A clock probe, done with the command "X -probeonly", will help you decide which of the above to use for your particular board. If the server consistently reports that it has detected an unknown clock generator, please e-mail me the stderr output.
Modes can be derived from the information in XFree86's doc directory. If you do not specify a "modes" line in the display subsection of the appropriate screen section of your XF86Config, the driver will generate a default mode and attempt to use it. The timings for the default mode are derived from the timings of the mode (usually a text mode) in effect when the server is started.
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