[ACPI] wrong documentation for /proc/acpi/sleep?

[ACPI] wrong documentation for /proc/acpi/sleep?

[Jochen Hein]

The documentation in Documentation/power/swsusp.txt reads:

,----
| Sleep states summary
| ====================
| 
| There are three different interfaces you can use, /proc/acpi should
| work like this:
| 
| In a really perfect world:
| echo 1 > /proc/acpi/sleep       # for standby
| echo 2 > /proc/acpi/sleep       # for suspend to ram
| echo 3 > /proc/acpi/sleep       # for suspend to ram, but with more
| power conservative
| echo 4 > /proc/acpi/sleep       # for suspend to disk
| echo 5 > /proc/acpi/sleep       # for shutdown unfriendly the system
| 
| and perhaps
| echo 4b > /proc/acpi/sleep      # for suspend to disk via s4bios
`----

I do get:
root@hermes:~# echo 2 > /proc/acpi/sleep
bash: /proc/acpi/sleep: No such file or directory

Kernel release is 2.6.14-rc1, ACPI/Power-related-config:
,----
| root@hermes:/usr/src/linux-2.6.14-rc1# grep ACPI .config
| # Power management options (ACPI, APM)
| # ACPI (Advanced Configuration and Power Interface) Support
| CONFIG_ACPI=y
| CONFIG_ACPI_AC=y
| CONFIG_ACPI_BATTERY=y
| CONFIG_ACPI_BUTTON=y
| CONFIG_ACPI_VIDEO=y
| CONFIG_ACPI_HOTKEY=y
| CONFIG_ACPI_FAN=y
| CONFIG_ACPI_PROCESSOR=y
| CONFIG_ACPI_THERMAL=y
| # CONFIG_ACPI_ASUS is not set
| CONFIG_ACPI_IBM=y
| # CONFIG_ACPI_TOSHIBA is not set
| CONFIG_ACPI_BLACKLIST_YEAR=0
| CONFIG_ACPI_DEBUG=y
| CONFIG_ACPI_EC=y
| CONFIG_ACPI_POWER=y
| CONFIG_ACPI_SYSTEM=y
| # CONFIG_ACPI_CONTAINER is not set
| CONFIG_X86_ACPI_CPUFREQ=y
| CONFIG_X86_SPEEDSTEP_CENTRINO_ACPI=y
| # CONFIG_X86_ACPI_CPUFREQ_PROC_INTF is not set
| # CONFIG_HOTPLUG_PCI_ACPI is not set
| CONFIG_PNPACPI=y
| root@hermes:/usr/src/linux-2.6.14-rc1# grep POWER .config
| CONFIG_ACPI_POWER=y
| # CONFIG_APM_REAL_MODE_POWER_OFF is not set
| CONFIG_CPU_FREQ_GOV_POWERSAVE=y
| # CONFIG_X86_POWERNOW_K6 is not set
| # CONFIG_X86_POWERNOW_K7 is not set
| # CONFIG_X86_POWERNOW_K8 is not set
| # CONFIG_USB_POWERMATE is not set
| root@hermes:/usr/src/linux-2.6.14-rc1# grep SWSU .config
| CONFIG_SWSUSP_ENCRYPT=y
`----

System is a Thinkpad R40, Debian/sarge with kernel 2.6.14-rc1. Did I
miss something obvious?

Jochen

-- 
#include <~/.signature>: permission denied

Re: [ACPI] wrong documentation for /proc/acpi/sleep?

[Jakub Piotr Clapa]

Jochen Hein wrote:
> The documentation in Documentation/power/swsusp.txt reads:
> 
> ,----
> | Sleep states summary
> | ====================
> | 
> | There are three different interfaces you can use, /proc/acpi should
> | work like this:
> | 
> | In a really perfect world:
> | echo 1 > /proc/acpi/sleep       # for standby
> | echo 2 > /proc/acpi/sleep       # for suspend to ram
> | echo 3 > /proc/acpi/sleep       # for suspend to ram, but with more
> | power conservative
> | echo 4 > /proc/acpi/sleep       # for suspend to disk
> | echo 5 > /proc/acpi/sleep       # for shutdown unfriendly the system
> | 
> | and perhaps
> | echo 4b > /proc/acpi/sleep      # for suspend to disk via s4bios
> `----
> 
> I do get:
> root@hermes:~# echo 2 > /proc/acpi/sleep
> bash: /proc/acpi/sleep: No such file or directory

Try 'cat /sys/power/state' and then echo one of the keywords back to 
this file.

-- 
Regards,
Jakub Piotr Cłapa

Re: [ACPI] wrong documentation for /proc/acpi/sleep?

[Len Brown]

On Thu, 2005-09-15 at 16:00 -0400, Jochen Hein wrote:
> 
> The documentation in Documentation/power/swsusp.txt reads:
> 
> ,----
> | Sleep states summary
> | ====================
> |
> | There are three different interfaces you can use, /proc/acpi should
> | work like this:
> |
> | In a really perfect world:
> | echo 1 > /proc/acpi/sleep       # for standby
> | echo 2 > /proc/acpi/sleep       # for suspend to ram
> | echo 3 > /proc/acpi/sleep       # for suspend to ram, but with more
> | power conservative
> | echo 4 > /proc/acpi/sleep       # for suspend to disk
> | echo 5 > /proc/acpi/sleep       # for shutdown unfriendly the system
> |
> | and perhaps
> | echo 4b > /proc/acpi/sleep      # for suspend to disk via s4bios
> `----

You're right, swsusp.txt is out of date.
/proc/acpi/sleep is deprecated -- and the S2 comment was nonsense from
the start.

> I do get:
> root@hermes:~# echo 2 > /proc/acpi/sleep
> bash: /proc/acpi/sleep: No such file or directory
> 
> Kernel release is 2.6.14-rc1, ACPI/Power-related-config:
> ,----
> | root@hermes:/usr/src/linux-2.6.14-rc1# grep ACPI .config
> | # Power management options (ACPI, APM)
> | # ACPI (Advanced Configuration and Power Interface) Support
> | CONFIG_ACPI=y
> | CONFIG_ACPI_AC=y
> | CONFIG_ACPI_BATTERY=y
> | CONFIG_ACPI_BUTTON=y
> | CONFIG_ACPI_VIDEO=y
> | CONFIG_ACPI_HOTKEY=y
> | CONFIG_ACPI_FAN=y
> | CONFIG_ACPI_PROCESSOR=y
> | CONFIG_ACPI_THERMAL=y
> | # CONFIG_ACPI_ASUS is not set
> | CONFIG_ACPI_IBM=y
> | # CONFIG_ACPI_TOSHIBA is not set
> | CONFIG_ACPI_BLACKLIST_YEAR=0
> | CONFIG_ACPI_DEBUG=y
> | CONFIG_ACPI_EC=y
> | CONFIG_ACPI_POWER=y
> | CONFIG_ACPI_SYSTEM=y
> | # CONFIG_ACPI_CONTAINER is not set
> | CONFIG_X86_ACPI_CPUFREQ=y
> | CONFIG_X86_SPEEDSTEP_CENTRINO_ACPI=y
> | # CONFIG_X86_ACPI_CPUFREQ_PROC_INTF is not set
> | # CONFIG_HOTPLUG_PCI_ACPI is not set
> | CONFIG_PNPACPI=y
> | root@hermes:/usr/src/linux-2.6.14-rc1# grep POWER .config
> | CONFIG_ACPI_POWER=y
> | # CONFIG_APM_REAL_MODE_POWER_OFF is not set
> | CONFIG_CPU_FREQ_GOV_POWERSAVE=y
> | # CONFIG_X86_POWERNOW_K6 is not set
> | # CONFIG_X86_POWERNOW_K7 is not set
> | # CONFIG_X86_POWERNOW_K8 is not set
> | # CONFIG_USB_POWERMATE is not set
> | root@hermes:/usr/src/linux-2.6.14-rc1# grep SWSU .config
> | CONFIG_SWSUSP_ENCRYPT=y
> `----
> 
> System is a Thinkpad R40, Debian/sarge with kernel 2.6.14-rc1. Did I
> miss something obvious?

Enable CONFIG_ACPI_SLEEP

for /proc/acpi/sleep, you'll need
CONFIG_ACPI_SLEEP_PROC_FS
which will allow
CONFIG_ACPI_SLEEP_PROC_SLEEP

cheers,
-Len