Bug#721468: linux-image-3.2.0-4-amd64: Incorrect battery level information
Package: src:linux
Version: 3.2.46-1+deb7u1
Severity: normal
Hi,
g-s-d (among other tools) reports wrong battery information because UPower gets
erroneous data from the sysfs interface. AFAIUI, since Linux 2.6.34, the
_BIX (Battery Information Extended) method is used instead of _BIF *but*
the acpi battery driver doesn't parse correctly these information
because it doesn't respect the ACPI spec.
So in the current Wheezy kernel, we have this kind of nonsense reported
by the sysfs interface:
$cat /sys/class/power_supply/BAT0/uevent
POWER_SUPPLY_NAME=BAT0
POWER_SUPPLY_STATUS=Discharging
POWER_SUPPLY_PRESENT=1
POWER_SUPPLY_TECHNOLOGY=Unknown
POWER_SUPPLY_CYCLE_COUNT=503
POWER_SUPPLY_VOLTAGE_MIN_DESIGN=1000
POWER_SUPPLY_VOLTAGE_NOW=7400000
POWER_SUPPLY_POWER_NOW=9205000
POWER_SUPPLY_ENERGY_FULL_DESIGN=0
POWER_SUPPLY_ENERGY_FULL=50616000
POWER_SUPPLY_ENERGY_NOW=20394000
POWER_SUPPLY_MODEL_NAME=
POWER_SUPPLY_MANUFACTURER=LIon
POWER_SUPPLY_SERIAL_NUMBER=UX31-35
Note the POWER_SUPPLY_VOLTAGE_MIN_DESIGN and POWER_SUPPLY_ENERGY_FULL_DESIGN
values.
But with commit 016d5baad04269e8559332df05f89bd95b52d6ad applied to your
last 3.2 kernel, here is what i get:
$cat /sys/class/power_supply/BAT0/uevent
POWER_SUPPLY_NAME=BAT0
POWER_SUPPLY_STATUS=Discharging
POWER_SUPPLY_PRESENT=1
POWER_SUPPLY_TECHNOLOGY=Li-ion
POWER_SUPPLY_CYCLE_COUNT=503
POWER_SUPPLY_VOLTAGE_MIN_DESIGN=7400000
POWER_SUPPLY_VOLTAGE_NOW=7400000
POWER_SUPPLY_POWER_NOW=8214000
POWER_SUPPLY_ENERGY_FULL_DESIGN=50616000
POWER_SUPPLY_ENERGY_FULL=44007000
POWER_SUPPLY_ENERGY_NOW=21045000
POWER_SUPPLY_MODEL_NAME=UX31-35
POWER_SUPPLY_MANUFACTURER=ASUSTeK
POWER_SUPPLY_SERIAL_NUMBER=
As you can see, with this patch applied g-s-d reports correct battery level information.
Cheers,
Vincent
-- System Information:
Debian Release: jessie/sid
APT prefers testing
APT policy: (990, 'testing'), (500, 'stable-updates'), (500, 'unstable'), (500, 'stable'), (1, 'experimental')
Architecture: amd64 (x86_64)
Kernel: Linux 3.2.0-4-amd64 (SMP w/4 CPU cores)
Locale: LANG=fr_FR.UTF-8, LC_CTYPE=fr_FR.UTF-8 (charmap=UTF-8)
Shell: /bin/sh linked to /bin/dash
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