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tld
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Joined: 09 Dec 2003
Posts: 1852
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 Posted: Mon Oct 12, 2015 1:35 pm Post subject: hwclock stopped working after update? [SOLVED] |
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After updating yesterday (no change or update to the kernel), hwclock stopped working. On bootup I'm getting this:
| Code: | * Setting hardware clock using the system clock [UTC] ...
hwclock: Cannot access the Hardware Clock via any known method.
hwclock: Use the --debug option to see the details of our search for an access method. |
If I try to run it manually I get this:
| Code: | hwclock --utc
hwclock: Cannot access the Hardware Clock via any known method.
hwclock: Use the --debug option to see the details of our search for an access method.
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I'm assuming this is because of the upgrade to sys-apps/util-linux-2.26.2 from 2.25.2-r2. Does that version require different kernel options? If it's related to RTC here's what I've always had:
| Code: | grep RTC /usr/src/linux-4.0.5-gentoo/.config
CONFIG_RTC_LIB=y
# CONFIG_RTC_CLASS is not set
# CONFIG_INTEL_SMARTCONNECT is not set
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Any ideas? Thanks.
Last edited by tld on Mon Oct 12, 2015 2:07 pm; edited 1 time in total |
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tld
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Joined: 09 Dec 2003
Posts: 1852
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| Posted: Mon Oct 12, 2015 1:40 pm Post subject: |
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Another machine here still running the older linux utils (with the same kernel RTC settings) does this:
| Code: | hwclock --debug
hwclock from util-linux 2.25.2
hwclock: cannot open /dev/rtc: No such file or directory
Using direct I/O instructions to ISA clock.
Last drift adjustment done at 1306064760 seconds after 1969
Last calibration done at 1304631937 seconds after 1969
Hardware clock is on UTC time
Assuming hardware clock is kept in UTC time.
Waiting for clock tick...
...got clock tick
Time read from Hardware Clock: 2015/10/12 13:36:35
Hw clock time : 2015/10/12 13:36:35 = 1444656995 seconds since 1969
Mon 12 Oct 2015 09:36:35 AM EDT -0.781206 seconds
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Whereas this machine (the upgraded one) gives me this:
| Code: | hwclock --debug
hwclock from util-linux 2.26.2
hwclock: cannot open /dev/rtc: No such file or directory
No usable clock interface found.
hwclock: Cannot access the Hardware Clock via any known method. |
Apparently that "Using direct I/O instructions to ISA clock" is no longer happening(?). |
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tld
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Joined: 09 Dec 2003
Posts: 1852
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| Posted: Mon Oct 12, 2015 2:07 pm Post subject: |
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Apparently hwclock no longer uses that direct ISA when RTC isn't expressly compiled into the kernel. This is from the man page:
| Code: | As of v2.26 it will no longer automatically use directisa when the rtc driver is unavailable; this
was causing an unsafe condition that could allow two processes to access the Hardware Clock at the same time. |
I made this change to my /etc/conf.d/hwclock:
| Code: | | clock_args="--directisa" |
...which is apparently needed without RTC.
Tom |
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khayyam
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Joined: 07 Jun 2012
Posts: 6227
Location: Room 101
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| Posted: Mon Oct 12, 2015 2:09 pm Post subject: |
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| tld wrote: | | Apparently that "Using direct I/O instructions to ISA clock" is no longer happening(?). |
tld ... try adding '--directisa'
/etc/conf.d/hwclock
| Code: | | clock_args="--directisa" |
HTH & best ... khay
edit ... I see you've since figured this |
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tld
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Posts: 1852
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| Posted: Mon Oct 12, 2015 3:36 pm Post subject: |
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| khayyam wrote: | | edit ... I see you've since figured this |
Thanks just the same! |
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