--- Comment #37 from gyhor@gmx.... 2012-08-16 10:08:23 UTC ---
I am not sure. In function radeon_atpx_pci_probe_handle() do get the
DEVICE_ACPI_HANDLE:
dhandle = DEVICE_ACPI_HANDLE(&pdev->dev);
It fails with
status = acpi_get_handle(dhandle, "ATPX", &atpx_handle);