Difference between revisions of "Problems with hwclock"
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== Affected Models == | == Affected Models == | ||
| − | *Thinkpad {{T60}} | + | *Thinkpad {{T60}} (not all models) |
| + | *Thinkpad {{T61}} (type 7662, maybe others) | ||
*Thinkpad {{T60p}} | *Thinkpad {{T60p}} | ||
*Thinkpad {{X60s}} | *Thinkpad {{X60s}} | ||
Revision as of 22:21, 23 May 2007
This page discusses the problem with /dev/rtc on certain models.
Contents
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
Using the --directisa switch of hwclock(8)
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.
Generic instructions
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
#!/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.
Debian 4.0 (etch)
Add the following to /etc/default/rcS:
HWCLOCKPARS="--directisa"
Debian 3.1 (sarge) and previous
Edit /etc/init.d/hwclock.sh and change all instances of "/sbin/hwclock" to "/sbin/hwclock --directisa".
Compiling RTC-support into the kernel instead of as a module
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
Affected Models
- Thinkpad T60 (not all models)
- Thinkpad T61 (type 7662, maybe others)
- Thinkpad T60p
- Thinkpad X60s
- Thinkpad Z61m
Affected Operating Systems
- Linux, all flavours. Tested with kernel 2.6.18, 2.6.19, 2.6.20.6
