[opensuse-kernel] Aliens ate /proc/acpi/battery/BAT*
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?
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
Gerald
--
Dr. Gerald Pfeifer
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
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 -- To unsubscribe, e-mail: opensuse-kernel+unsubscribe@opensuse.org To contact the owner, e-mail: opensuse-kernel+owner@opensuse.org
Le Wednesday 06 May 2015 à 14:22 +0200, Jean Delvare a écrit :
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.
Would that work for you? #!/bin/bash # Sample time in seconds SAMPLE_TIME=10 declare -a energy_full_design energy_full energy_now sum() { local v=$1 shift s=0; printf "%18s = " "$v" while [ $# -gt 0 ]; do i=$(($1/1000)) printf "%5s " "$i" s=$(($s+$i)) shift done printf " = %s\n" "$s" save=$s } energy_full_design=(`cat /sys/class/power_supply/BAT*/energy_full_design`) energy_full=(`cat /sys/class/power_supply/BAT*/energy_full`) energy_now=(`cat /sys/class/power_supply/BAT*/energy_now`) sum "design capacity" "$energy_full_design" sum "last full capacity" "$energy_full" sum "remaining capacity" "$energy_now" sum_then=$save sleep $SAMPLE_TIME energy_now=(`cat /sys/class/power_supply/BAT*/energy_now`) sum "remaining capacity" "$energy_now" sum_now=$save rate=$((($sum_now-$sum_then)/$SAMPLE_TIME)) printf "%18s = %5s\n" "rate" "$rate" (I'm not necessarily proud of everything in this script.) -- Jean Delvare SUSE L3 Support -- To unsubscribe, e-mail: opensuse-kernel+unsubscribe@opensuse.org To contact the owner, e-mail: opensuse-kernel+owner@opensuse.org
Am 06.05.2015 um 14:22 schrieb Jean Delvare:
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.
"power_now" is basically what the "rate" was, but it's expressed in microwatts while in /proc it could be either mA or mW IIRC. -- Stefan Seyfried "For a successful technology, reality must take precedence over public relations, for nature cannot be fooled." -- Richard Feynman -- To unsubscribe, e-mail: opensuse-kernel+unsubscribe@opensuse.org To contact the owner, e-mail: opensuse-kernel+owner@opensuse.org
Hallo Stefan, Le Thursday 07 May 2015 à 21:09 +0200, Stefan Seyfried a écrit :
Am 06.05.2015 um 14:22 schrieb Jean Delvare:
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.
"power_now" is basically what the "rate" was, but it's expressed in microwatts while in /proc it could be either mA or mW IIRC.
Baah, thanks for pointing out the obvious, I must have been blind :( Whatever the unit is, it's impressively undocumented. So anyway Gerald's script can be simplified again to: #!/bin/bash sum() { s=0; while read i; do i=$(($i/1000)) printf "%5s " "$i" s=$(($s+$i)) done printf " = %s\n" "$s" } for v in "energy_full_design" "energy_full" "energy_now" "power_now"; do printf "%18s = " "$v" cat /sys/class/power_supply/BAT*/$v | sum done -- Jean Delvare SUSE L3 Support -- To unsubscribe, e-mail: opensuse-kernel+unsubscribe@opensuse.org To contact the owner, e-mail: opensuse-kernel+owner@opensuse.org
On Thu 2015-05-07, Jean Delvare wrote:
So anyway Gerald's script can be simplified again to:
Super! Thanks a lot, Jean (and Stefan). I've been travelling the last two weeks, hence did not respond earlier. Below you'll find the script as I am using it now, which works both off /sys/class/power_supply and /proc/acpi/battery, so across different versions of openSUSE and SUSE Linux Enterprise. (Somehow the "if ls /sys/class/power_supply/BAT* >/dev/null; then" strikes me as overkill. Is there a way to accomplish this easier? Or can we assume the first battery always has index 0 and simply check for BAT0?) Gerald ====== script ====== #!/bin/bash sum() { s=0; while read l; do i=`echo $l | cut -d' ' -f1` printf "%5s " "$i" s=$(($s+$i)) done printf " = %5s\n" "$s" } if ls /sys/class/power_supply/BAT* >/dev/null; then for v in "energy_full_design" "energy_full" "energy_now" "power_now"; do printf "%18s = " "$v" #cat /sys/class/power_supply/BAT*/$v | sed -e 's/\(.*\)\([0-9][0-9]\)0000$/\1.\2/' | sum cat /sys/class/power_supply/BAT*/$v | sed -e 's/000$//' | sum done else for v in "design capacity" "last full capacity" "remaining capacity" "rate"; do printf "%18s = " "$v" cat /proc/acpi/battery/BAT*/* | grep "$v:" | cut -d: -f2 | sum done fi -- To unsubscribe, e-mail: opensuse-kernel+unsubscribe@opensuse.org To contact the owner, e-mail: opensuse-kernel+owner@opensuse.org
Hallo Gerald, On Sat, 16 May 2015 12:50:19 -0400 (EDT), Gerald Pfeifer wrote:
On Thu 2015-05-07, Jean Delvare wrote:
So anyway Gerald's script can be simplified again to:
Super! Thanks a lot, Jean (and Stefan). I've been travelling the last two weeks, hence did not respond earlier.
You're welcome, no problem.
Below you'll find the script as I am using it now, which works both off /sys/class/power_supply and /proc/acpi/battery, so across different versions of openSUSE and SUSE Linux Enterprise.
(Somehow the "if ls /sys/class/power_supply/BAT* >/dev/null; then" strikes me as overkill. Is there a way to accomplish this easier? Or can we assume the first battery always has index 0 and simply check for BAT0?)
That would rather be a question for Thomas, but I'm afraid it's not even guaranteed that batteries show up as BAT*, even though I think all laptops I've seen so far used that name. But the first battery may not be BAT0, for example on my old Panasonic Toughbook CF-18 it's named BATA. To be on the bulletproof side I think you must check that sysfs attribute "type" has value "Battery". You can avoid the call to "ls", with a construct like: if [ -n "$(shopt -s nullglob ; echo /sys/class/power_supply/BAT*)" ] Not sure if it's significantly faster though. It might be easier to just check for -d /sys/class/power_supply anyway, as I would guess that in practice it's always populated when present?
====== script ====== #!/bin/bash
sum() { s=0; while read l; do i=`echo $l | cut -d' ' -f1` printf "%5s " "$i" s=$(($s+$i)) done printf " = %5s\n" "$s" }
if ls /sys/class/power_supply/BAT* >/dev/null; then for v in "energy_full_design" "energy_full" "energy_now" "power_now"; do printf "%18s = " "$v" #cat /sys/class/power_supply/BAT*/$v | sed -e 's/\(.*\)\([0-9][0-9]\)0000$/\1.\2/' | sum cat /sys/class/power_supply/BAT*/$v | sed -e 's/000$//' | sum
This assumes that the last 3 digits are always 000, which doesn't have to be true. sed -e 's/...$//' would be safer.
done else 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 fi
-- Jean Delvare SUSE L3 Support -- To unsubscribe, e-mail: opensuse-kernel+unsubscribe@opensuse.org To contact the owner, e-mail: opensuse-kernel+owner@opensuse.org
participants (3)
-
Gerald Pfeifer -
Jean Delvare -
Stefan Seyfried