http://bugzilla.kernel.org/show_bug.cgi?id=9518
Summary: Regression from 2.6.21: Can not use echo -n
"5">/proc/acpi/sleep
Product: ACPI
Version: 2.5
KernelVersion: 2.6.24-rc4
Platform: All
OS/Version: Linux
Tree: Mainline
Status: NEW
Severity: normal
Priority: P1
Component: Power-Off
AssignedTo: [EMAIL PROTECTED]
ReportedBy: [EMAIL PROTECTED]
CC: [EMAIL PROTECTED]
Most recent kernel where this bug did not occur:2.6.21
Distribution:xandros, debian
Hardware Environment:Asus EeePC, Asus EP20
Software Environment:
Problem Description:We had originally some problems using a regular "C"
reboot(poweroff) call from our init C prog, however writing 5 to
/proc/acpi/sleep worked OK.
It was broken in 2.6.22, and still is in 2.6.24-rc4
Steps to reproduce:
echo -n "5">/proc/acpi/sleep
will fail with ENODEV, because in (2.6.24)
kernel/power/main.c/valid_state(4)/suspend_ops->valid(state)
returns NULL
Call chain:
valid_state() is called from drivers/acpi/sleep/proc.c/acpi_system_write()
which calls drivers/acpi/sleep/main.c/acpi_suspend(5)
which calls kernel/power/main.c/pm_suspend(4)
which calls kernel/power/main.c/enter_state(4)
which calls kernel/power/main.c/valid_state(4)
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