https://bugzilla.kernel.org/show_bug.cgi?id=33672
Summary: ACPI: discharge rate zero reported by kernel
Product: ACPI
Version: 2.5
Kernel Version: >= 2.6.32
Platform: All
OS/Version: Linux
Tree: Mainline
Status: NEW
Severity: normal
Priority: P1
Component: Power-Battery
AssignedTo: acpi_power-batt...@kernel-bugs.osdl.org
ReportedBy: acimmaru...@gmail.com
Regression: Yes
This is an upstream bug report for Debian's bug # 623019
http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=623019
gnome-power-manager has stopped displaying the time remaining on my
laptop battery.
It doesn't appear to be a bug in g-p-m, and perhaps not even in upower
but in acpi. This is the proof:
$ acpi
Battery 0: Discharging, 99%, discharging at zero rate - will
never fully discharge.
Sometime later I rerun same command
$ acpi Battery 0: Discharging, 90%, discharging at zero rate - will
never fully discharge.
The maintainer of the Debian package for acpi-client says that the bug is in
the kernel that has stopped reporting the discharge rate.
It is worth noting that I've found a similar bug report in Arch Linux:
https://bugs.archlinux.org/task/21917
This led me to realize that the Debian testing kernel (now at 2.6.38) does not
have the option CONFIG_ACPI_PROCFS nor CONFIG_ACPI_PROCFS_POWER enabled. That
is, no battery directory or info is stored in /proc/acpi/battery/, but in
/sys/class/power_supply/battery/...so perhaps the kernel still is not providing
all the info it used in the old directory system. I will try compiling the
kernel with these options enabled and see if this works.
Andres Cimmarusti
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