Re: [opensuse-kernel] Aliens ate /proc/acpi/battery/BAT*

6 May 2015

      Hi Gerald,

Le Tuesday 05 May 2015 à 16:20 +0200, Gerald Pfeifer a écrit :
...
I have a hunc "this is a feature, not a bug" ;-), but with
the update to kernel 4.0, /proc/acpi/battery/BAT* is gone.
Is there a way (config option we could enable) to get this
back?
It was removed on purpose by:

commit 9eb6ba436281fa55e9eb5442d69d09a388b47706
Author: Jeff Mahoney <jeffm@suse.com>
Date:   Mon Mar 23 11:02:52 2015 -0400

    config: disable CONFIG_ACPI_PROCFS_POWER (i386/x86_64) (boo#917728)

    CONFIG_ACPI_PROCFS_POWER is deprecated and should be disabled.

Of course, re-enabling it would temporarily solve your problem, but we
really want to get rid of it in the long run, so the best option is to
update your custom script to use the "new" sysfs interface instead. You
should be able to find under /sys/class/power_supply/BAT* almost
everything you used to see in /proc/acpi/battery/BAT*.
...
If not, how can I best re-implement something like the little
script below (which works for more than one battery in case 
you are wondering about the complexity):
#!/bin/bash
sum() {
  s=0;
  while read l; do
    i=`echo $l | cut -d' ' -f1`
    printf "%5s " "$i"
    s=$(($s+$i))
  done
  printf " = %s\n" "$s"
}
for v in "design capacity" "last full capacity" "remaining capacity" "rate"; do
  printf "%18s = " "$v"
  cat /proc/acpi/battery/BAT*/* | grep "$v:" | cut -d: -f2 | sum
done
The following should work except for the "rate" which isn't mentioned in
the sysfs interface. I seem to understand that this isn't considered a
property of the battery so you have to derive it yourself from the the
other numbers over an arbitrary period.

#!/bin/bash

sum() {
  s=0;
  while read l; do
    i=`echo $l | cut -d' ' -f1`
    i=$(($i/1000))
    printf "%5s " "$i"
    s=$(($s+$i))
  done
  printf " = %s\n" "$s"
}

for v in "energy_full_design" "energy_full" "energy_now"; do
  printf "%18s = " "$v"
  cat /sys/class/power_supply/BAT*/$v | sum
done

Hope that helps,
-- 
Jean Delvare
SUSE L3 Support

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