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From: Francisco Ares <frares@gmail.com>
Date: Tue, 11 Jun 2013 14:50:46 -0300
Message-ID: <CAHH9eM72WkxHdf-mVcJFw7AhoUZzYJsT9JuQURmWEytB735h2g@mail.gmail.com>
Subject: Re: [gentoo-user] [OT] Recent git kernels break rtc (real-time-clock)
To: gentoo-user@lists.gentoo.org
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2013/6/11 Paul Hartman <paul.hartman+gentoo@gmail.com>
> 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.
>
>
I'm using gentoo-sources-3.8.13 - out of your scope, though, but I have
recently faced the same issue.
I rebuilt the kernel using "--menuconfig", to make sure that all RTC
options were enabled. It works, now.
Good luck
Francisco
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<div class=3D"gmail_quote">2013/6/11 Paul Hartman <span dir=3D"ltr"><<a =
href=3D"mailto:paul.hartman+gentoo@gmail.com" target=3D"_blank">paul.hartma=
n+gentoo@gmail.com</a>></span><br><blockquote class=3D"gmail_quote" styl=
e=3D"margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
On Mon, Jun 10, 2013 at 7:31 PM, walt <<a href=3D"mailto:w41ter@gmail.co=
m">w41ter@gmail.com</a>> wrote:<br>
> After the recent 3.9 --> 3.10 kernel merge window, udev no longer c=
reates<br>
> /dev/rtc (or /dev/rtc0) during bootup on my ~amd64 machines. (The only=
<br>
> machines I have now.)<br>
<br>
Not a git-kernel nerd, but just an ordinary kernel nerd. :)<br>
<br>
The kernel RTC driver creates /dev/rtc0 and then I assume udev creates<br>
/dev/rtc from there, so if you are missing rtc0 that's a possible<br>
source of the problem. Which would coincide with your kernel upgrade.<br>
<br>
I know 3.9 introduced a couple new RTC-related option so maybe it<br>
changed around some more to 3.10 series. I would run menuconfig and<br>
see what it thinks you have enabled in that section, just in case<br>
something got lost in transition from one kernel to the next.<br>
<br>
In dmesg on my non-git 3.9.4 kernel it looks like:<br>
<br>
[ =C2=A0 =C2=A01.237994] rtc_cmos 00:04: RTC can wake from S4<br>
[ =C2=A0 =C2=A01.238158] rtc_cmos 00:04: rtc core: registered rtc_cmos as r=
tc0<br>
[ =C2=A0 =C2=A01.238177] rtc_cmos 00:04: alarms up to one month, y3k, 114 b=
ytes<br>
nvram, hpet irqs<br>
[ =C2=A0 =C2=A01.241101] rtc_cmos 00:04: setting system clock to 2013-06-04=
<br>
04:28:34 UTC (1370320114)<br>
<br>
I'm using the "PC-Style CMOS" RTC driver, and I have all of t=
he<br>
RTC-related options enabled except for the debugging options.<br>
<br>
</blockquote></div><br><br clear=3D"all">I'm using gentoo-sources-3.8.1=
3 - out of your scope, though, but I have recently faced the same issue.<br=
><br>I rebuilt the kernel using "--menuconfig", to make sure that=
all RTC options were enabled.=C2=A0 It works, now.<br>
<br>Good luck<br>Francisco<br>
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