Ubuntu
acpi package

  1. Bug #403918
  2. Comment #4

Comment 4 for bug 403918

Revision history for this message
Vlado Plaga (vlado-gmx) wrote :

Too bad bugzilla.kernel.org has now been down for so many weeks... so this issue can't be taken to where it probably should really be discussed.

Here is the workaround I'm now using:

I'm writing the desired wakeup time both to /sys/class/rtc/rtc0/wakealarm and to a file on the file system (/etc/wakeup_time) and in /etc/rc.local I included:

"cat /etc/wakeup_time > /sys/class/rtc/rtc0/wakealarm"

This seems to work reliably enough, but still it's just a workaround and people will loose time by stumbling upon this bug, as I did.

This problem seems to exist for years already, according to some reports. More than a year ago I set up a dual-boot PPC Mac mini to wake up on certain days to record certain radio shows, and I noticed I could not boot Linux anymore because that reset the programmed wakeup time. That system did not have ACPI of course, and I thought booting Mac OS was required to refresh the RTC on every reboot... but maybe it was just this issue.