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List:       gentoo-user
Subject:    Re: [gentoo-user] [OT] Recent git kernels break rtc (real-time-clock)
From:       Paul Hartman <paul.hartman+gentoo () gmail ! com>
Date:       2013-06-11 17:33:59
Message-ID: CAEH5T2NNRR950hUT_wZZqy-25ntCOw4E0CBsmqvi9dYmgLngVA () mail ! gmail ! com
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On Mon, Jun 10, 2013 at 7:31 PM, walt <w41ter@gmail.com> wrote:
> After the recent 3.9 --> 3.10 kernel merge window, udev no longer creates
> /dev/rtc (or /dev/rtc0) during bootup on my ~amd64 machines. (The only
> machines I have now.)

Not a git-kernel nerd, but just an ordinary kernel nerd. :)

The kernel RTC driver creates /dev/rtc0 and then I assume udev creates
/dev/rtc from there, so if you are missing rtc0 that's a possible
source of the problem. Which would coincide with your kernel upgrade.

I know 3.9 introduced a couple new RTC-related option so maybe it
changed around some more to 3.10 series. I would run menuconfig and
see what it thinks you have enabled in that section, just in case
something got lost in transition from one kernel to the next.

In dmesg on my non-git 3.9.4 kernel it looks like:

[    1.237994] rtc_cmos 00:04: RTC can wake from S4
[    1.238158] rtc_cmos 00:04: rtc core: registered rtc_cmos as rtc0
[    1.238177] rtc_cmos 00:04: alarms up to one month, y3k, 114 bytes
nvram, hpet irqs
[    1.241101] rtc_cmos 00:04: setting system clock to 2013-06-04
04:28:34 UTC (1370320114)

I'm using the "PC-Style CMOS" RTC driver, and I have all of the
RTC-related options enabled except for the debugging options.

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