ATI Adapters README file : XF86Config specifications : Clocks : Clocks for unsupported programmable clock generators
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## 5.2.2. Clocks for unsupported programmable clock generators

This case is unlikely to occur, but is documented for the sake of completeness.

In this situation, the driver will probe the adapter for clock frequencies unless XF86Config clocks are already specified. In either case, the driver will then attempt to normalize the clocks to one of the following specifications:

    BIOS setting 1:

      Clocks   0.000 110.000 126.000 135.000  50.350  56.640  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  25.180  28.320  31.500  36.000
               0.000  40.000  37.500  32.500  20.000  22.450  24.750  25.000

    BIOS setting 2:

      Clocks   0.000 110.000 126.000 135.000  25.180  28.320  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  12.590  14.160  15.750  18.000
               0.000  40.000  37.500  32.500  20.000  22.450  24.750  25.000

    BIOS setting 3:

      Clocks   0.000   0.000   0.000   0.000  25.180  28.320   0.000   0.000
               0.000   0.000   0.000   0.000   0.000   0.000   0.000   0.000
               0.000   0.000   0.000   0.000  12.590  14.160   0.000   0.000
               0.000   0.000   0.000   0.000   0.000   0.000   0.000   0.000

If the driver matches the clocks to the third setting above, functionality will be *extremely* limited (assuming the driver works at all).

ATI Adapters README file : XF86Config specifications : Clocks : Clocks for unsupported programmable clock generators
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