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Running rtcwake

(4 posts) (2 voices)

• Started 11 years ago by weilah
• Latest reply from weilah
• This topic is not resolved

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1. 

   weilah
   

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   Member

   Hi there!

   This is my first post in the forum, so first of all I wanna thank all the people who are maintaining this project. It's amazing!!

   I'm trying to put my system sleep using rtcwake. Every instruction that I'm giving has the same output:

   :~# rtcwake -s 60
   rtcwake: /dev/rtc not enabled for wakeup events

   It seems that /dev/rtc exists, but no /dev/rtc0. I've even tried:

   :~# rtcwake -d /dev/rtc0 -m mem -s 60
   rtcwake: can't open '/dev/rtc0': No such file or directory

   I don't know how to enable the /dev/rtc. Does anybody has a clue? The rtc driver seems to be good configured to me...but maybe I'm missing something. I'm no Linux expert:

   :~# cat /proc/driver/rtc
   rtc_time	: 20:42:13
   rtc_date	: 2013-04-19
   rtc_epoch	: 1900
   alarm		: 00:00:00
   DST_enable	: no
   BCD		: yes
   24hr		: yes
   square_wave	: no
   alarm_IRQ	: no
   update_IRQ	: no
   periodic_IRQ	: no
   periodic_freq	: 1024
   batt_status	: okay

   I'm running SliTaz installed in a hdd using the slitaz-4.0-core.iso. If you need details of the hardware, just tell me.

   Thanks once again

   Posted 11 years ago #
2. 

   emgi
   

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   Member

   Looks like an issue I ran into recently.
   You can create the device manually:
   # mknod /dev/rtc0 c 254 0

   The numbers are significant, and presumably correct.
   If you run into troubles do a google search on mknod /dev/rtc0

   /emgi

   Posted 11 years ago #
3. 

   weilah
   

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   Member

   Hi emgi, thanks for helping.

   I created the device as you said:

   # mknod /dev/rtc0 c 254 0

   The first try give me unfortunately the same result:
   

   # rtcwake -m mem -s 60
   rtcwake: /dev/rtc not enabled for wakeup events

   So I thought that it uses /dev/rtc per default, but even giving the device flag seems to run into troubles.

   # rtcwake -d /dev/rtc0 -m mem -s 60
   rtcwake: can't open '/dev/rtc0': No such device or address

   But the new device really exists
   

   # ls -l /dev/rtc0
   crw-r--r--    1 root     root      254,   0 Apr 20 09:23 /dev/rtc0

   as does the /dev/rtc
   

   # ls -l /dev/rtc
   crw-------    1 root     root       10, 135 Apr 20 09:24 /dev/rtc

   Maybe I should somehow enable the /dev/rtc to be able to recieve wakeup events. But I have sincerely no idea if that is even possible or not.

   Thanks again

   weilah

   Posted 11 years ago #
4. 

   weilah
   

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   Member

   No ideas there?

   thanks

   Posted 11 years ago #

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