How do I know if I have KMS enabled?

linux graphics-card amd-radeon ati-mobility-radeon

Kernel modesetting for radeon driver is supported after kernel version 2.6.31. If you have the driver with the version of later, you will be able to see a line that says "radeon kernel modesetting enabled." in dmesg log. Please check if dmesg contains any string with "modesetting."

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