ATI Adapters README file : XF86Config specifications : Clocks : Clocks for non-ATI adapters
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## 5.2.4. Clocks for non-ATI adapters

If no clocks are specified in the XF86Config, the driver will probe for four clocks, the second of which will be assumed to be 28.322MHz. You can include up to four clock frequencies in your XF86Config to specify the actual values used by the adapter. Any more will be ignored.

ATI Adapters README file : XF86Config specifications : Clocks : Clocks for non-ATI adapters
Previous: Clocks for fixed clock generators on ATI adapters
Next: Option "nolinear"