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Old 03-19-2012, 04:00 PM   #1
business_kid
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/proc/acpi/* equivalents in /sys?


I'm on Slackware-13.37 and need to update my ancient (Fedora or debian) acpi scripts which reference /proc/acpi, because as we would say here:There it is - gone!

This line that does a battery low check
Quote:
Next hopefully check the Battery is dead low
if grep -q critical /proc/acpi/battery/state
I tried leaving stuff out ( -->Instant hibernate) or replaced with
Quote:
# Next hopefully check the Battery is dead low
if grep -q critical /sys/devices/LNXSYSTM:00/device:00/PNP0C0A:00/power_supply/C1ED/status
And the thing stays on 'Discharging' until it dies. Yet the system knew what was going on, because I had this flashing orange light.
Where to pick it up?
 
Old 03-19-2012, 07:29 PM   #2
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/sys/class/power_supply/*
 
Old 03-20-2012, 04:35 AM   #3
business_kid
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Thanks for the reply.
/sys/class/power_supply has 2 symlinks, C1EC, & C1ED. C1EC is auxiliary battery, and not fitted. C1ED is a symlink to

/sys/devices/LNXSYSTM:00/device:00/PNP0C0A:00/power_supply/C1ED

and I have hunted here for some time before posting. Here's a listing:
Quote:
bash-4.1$ ls
alarm charge_now device/ power status type voltage_now
charge_full current_now manufacturer present subsystem uevent
charge_full_design cycle_count model_name serial_number technology voltage_min_design
The 'alarm' apparently occasionally flicks to 1 (It's normally 0) and I got nearly instant hibernate function when I tried watching that.
if grep -q 1 /sys/blah/alarm;

uevent has a line which is also in status which simply says discharging, until it's dead. The charge files have one six digit number (ľAh?). /proc/acpi is gone. Do I have to measure the value in charge now (currently 1267000) or something? How the <expletive deleted> would you do that in a bash script? (charge_now now 1200000).
 
Old 03-20-2012, 06:07 AM   #4
syg00
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Hmmm - I get a BAT0 that links back to that sysfs directory. As BAT0. Has all the content you'd expect (on Fedora 16 BTW, not Slack).
I thought I saw something similar reported. Fix was something about turning WMI off; needs a kernel recompile I think. Check the ACPI bugzilla.
 
Old 03-20-2012, 02:56 PM   #5
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I'm glad this question attracted the attention of a guru :-).

I went to rebuild the kernel, disabled WMI in vim and it threw me into 'silentoldconfig' asking
about WMI. I answered '?' and was told that

"The implementation of this in Linux currently only exposes (acpi wmi data) to other user-space drivers.

This driver is a required dependency to build the firmware specific drivers on many machines, including Acer & HP laptops." I hit Ctrl_C

This is a HP Compaq 6715S

???
 
Old 03-20-2012, 06:02 PM   #6
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I also see HP_WMI.
Time for you to make some decisions I guess - what do you want to be without the least ?. It's only a kernel build - try it and see.
 
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Old 03-21-2012, 04:14 AM   #7
business_kid
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I'm on 3.0.4 here. It's up at 3.2.x now
If there's something in a later ChangeLog, maybe somebody will mention it.
I'll do a kernel and report back
 
Old 03-21-2012, 01:40 PM   #8
business_kid
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Quote:
bash-4.1$ grep -n WMI .config
2001:CONFIG_SND_RAWMIDI=m
2019:CONFIG_SND_RAWMIDI_SEQ=m
2456:# CONFIG_ACPI_WMI is not set
That kernel produced no change, and no BAT0
Code:
bash-4.1$ cat /sys/class/power_supply/C1ED/uevent
POWER_SUPPLY_NAME=C1ED
POWER_SUPPLY_STATUS=Discharging
POWER_SUPPLY_PRESENT=1
POWER_SUPPLY_TECHNOLOGY=Li-ion
POWER_SUPPLY_CYCLE_COUNT=0
POWER_SUPPLY_VOLTAGE_MIN_DESIGN=10800000
POWER_SUPPLY_VOLTAGE_NOW=12001000
POWER_SUPPLY_CURRENT_NOW=1612000
POWER_SUPPLY_CHARGE_FULL_DESIGN=4979000
POWER_SUPPLY_CHARGE_FULL=4979000
POWER_SUPPLY_CHARGE_NOW=4799000
POWER_SUPPLY_MODEL_NAME=Primary
POWER_SUPPLY_MANUFACTURER=Hewlett-Packard
POWER_SUPPLY_SERIAL_NUMBER=23898 2011/03/10
Now I don't know what functions on the box that required WMI are incorrigibly knackered under this kernel, and I don't intend to find out.
Code:
bash-4.1$ ls /sys/class/power_supply/C1ED
alarm	charge_now	 device        power	      status	  type	      voltage_now
charge_full	    current_now  manufacturer  present	      subsystem   uevent
charge_full_design  cycle_count  model_name    serial_number  technology  voltage_min_design
I'm having to hack with vim because I only get this in menuconfig
Quote:
*** on-CPU RTC drivers ***
Make then comes in with a "What'as he been at? approach and asks questions.

Any ideas welcome.
 
Old 03-21-2012, 05:19 PM   #9
business_kid
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This has been sorted as follows. I followed the Standard Procedure outlined to me from my days in R & D:

"If at first you don't succeed - give up!"

I preferred acpi over XFCE's Power Manager as I am capable of running sessions without X running at all, but I will settle for XFCE's Power Manager. I have configured it to act on battery critical instead of configuring it to play in the traffic. It talks to Hal - the aptly named hardware interface (For anyone who saw the film 2001)
http://en.wikipedia.org/wiki/HAL_9000

Thanks, Guru, but what can the ordinary mortal who has a life to lead do?
 
  


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