http://bugzilla.kernel.org/show_bug.cgi?id=8995
Summary: /proc/acpi/alarm worked; update to 2.6.22.2 and
/sys/class/rtc/rtc0/wakealarm don't
Product: ACPI
Version: 2.5
KernelVersion: 2.6.22.2
Platform: All
OS/Version: Linux
Tree: Mainline
Status: NEW
Severity: normal
Priority: P1
Component: Power-Sleep-Wake
AssignedTo: [EMAIL PROTECTED]
ReportedBy: [EMAIL PROTECTED]
Most recent kernel where this bug did not occur:2.6.20
Distribution: FC6
Hardware Environment: ASUS A8N-SLI mobo, Athlon 64 3200+, PATA Disk
Software Environment: FC6, MythTV 0.20.2-164
Problem Description:
Change in kernel code from support for /proc/acpi/alarm to
/sys/class/rtc/rtc0/wakealarm and supporting code borked working system. Will
no longer wake at set time.
Time set <> time reported by cat /sys.../wakealarm. Return value off by large
constant. Note: Mobo doesn't support month, day, or year in alarm setting.
Steps to reproduce:
Before upgrade from 2.6.20 to 2.6.22.2, suspend-to-disk with powerdown to
standby would wake at time echoed into /proc/acpi/alarm. Change of wakeup time
setting code to echo 0 to /sys/class/rtc/rtc0/wakealarm followed by echo of
seconds since epoch of desired wakeup time under 2.6.22.2 does not work.
System will not wake up at specified time. Will wake by keyboard keystroke,
such as Ctrl+Esc. Tried enabling APM (BIOS) alarm setting and all entries
under /proc/acpi/wakeup (all on at once), but no improvement.
Test sequence:
# echo 0 > /sys/class/rtc/rtc0/wakealarm
# t=`date +%s`; w=`expr $t + 60`; echo $w > /sys/class/rtc/rtc0/wakealarm
# echo $w
1189268800
# cat /sys/class/rtc/rtc0/wakealarm
2076101696
# expr 2076101696 - 1189268800
886832896
<invoke your favorite code to suspend to disk and power down system leaving
standby power on>
<wait>
<wait some more>
<hit power on button>
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