https://www.thinkwiki.org/w/api.php?action=feedcontributions&feedformat=atom&user=IgratThinkWiki - User contributions [en]2026-04-22T11:30:12ZUser contributionsMediaWiki 1.31.12https://www.thinkwiki.org/w/index.php?title=Problems_with_hwclock&diff=30178Problems with hwclock2007-05-30T19:01:41Z<p>Igrat: </p>
<hr />
<div>This page discusses the problem with /dev/rtc on certain models.<br />
<br />
== Problem description ==<br />
On bootup,a message like this shows up:<br />
<br />
<pre>select() to /dev/rtc to wait for clock tick timed out</pre><br />
<br />
<br />
The RTC kernel driver can't handle the system clock.<br />
<br />
== Possible solutions ==<br />
<br />
=== Using the --directisa switch of hwclock(8) ===<br />
The '''hwclock''' command knows the parameter ''--directisa'' to access the system clock "directly" instead of accessing it by using /dev/rtc. There are several ways of doing this automatically.<br />
<br />
==== Generic instructions ====<br />
Move /sbin/hwclock (or wherever it is located on your system) to '''/sbin/hwclock.dist''' and create the following shell script, which you place at /sbin/hwclock<br />
<br />
<pre>#!/bin/sh<br />
/sbin/hwclock.dist --directisa "$@"</pre><br />
Make the script executable (apply the same permissions you had for ''hwclock'' before) and keep your packaging system from overwriting it on updates.<br />
<br />
==== Debian 4.0 (etch) ====<br />
Add the following to '''/etc/default/rcS''':<br />
<br />
<pre>HWCLOCKPARS="--directisa"</pre><br />
<br />
==== Debian 3.1 (sarge) and previous ====<br />
Edit '''/etc/init.d/hwclock.sh''' and change all instances of "/sbin/hwclock" to "/sbin/hwclock --directisa".<br />
<br />
==== Gentoo ====<br />
Edit '''/etc/init.d/clock''' and set ''CLOCK_OPTS'' to<br />
<pre>CLOCK_OPTS="--directisa"</pre><br />
<br />
=== Compiling RTC-support into the kernel instead of as a module ===<br />
<br />
Compiling RTC-support (CONFIG_RTC) into the kernel instead of compiling it as a module seems to work also. Tested on: 2.6.20.6 at Thinkpad {{Z61m}} 9450-3HG<br />
<br />
== Affected Models ==<br />
<br />
*Thinkpad {{T60}} (not all models)<br />
*Thinkpad {{T61}} (type 7662, maybe others)<br />
*Thinkpad {{T60p}}<br />
*Thinkpad {{X60s}}<br />
*Thinkpad {{Z61m}}<br />
<br />
== Affected Operating Systems ==<br />
<br />
*Linux, all flavours. Tested with kernel 2.6.18, 2.6.19, 2.6.20.6</div>Igrat