Problems with hwclock

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This page discusses the problem with /dev/rtc on certain models.

Problem description

On bootup,a message like this shows up:

select() to /dev/rtc to wait for clock tick timed out


The RTC kernel driver can't handle the system clock.

Possible solutions

The hwclock command knows the parameter --directisa to access the system clock directly. To make this the default behavior, move /sbin/hwclock (or whereever it is located on your system) to /sbin/hwclock.dist and create the following shell script on the previous location:

#!/bin/sh
/sbin/hwclock.dist --directisa $*

Make the script executable (apply the same permissions you had for hwclock before) and keep your packaging system from overwriting it on updates.

Affected Models

Affected Operating Systems

  • Linux, all flavours. Tested with kernel 2.6.18 and 2.6.19