Per Olofsson wrote:
> Good question. My guess is that the rtc_cmos module is simply the newer and
> better one, but I don't know.

It seems that rtc-cmos is a part of the new RTC subsystem of the kernel, while
rtc is the old driver. See Documentation/rtc.txt in kernel source:

http://lxr.linux.no/linux+v2.6.25.10/Documentation/rtc.txt

Whether rtc-cmos will work everywhere rtc works, I cannot say. But in my
experience, there are a lot of systems where rtc does not work currently (unless
it has been fixed in a recent kernel).

Also, only rtc-cmos supports configuring system wake-up time through ACPI.

-- 
Pelle



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