Sorry for the previous post. I didn't fully realize how the system works. But
back to the problem itself. I took a look about figures kernel reports in
sysfs. Looks like current_now is always same figure as power_now, meaning
current_now is insane, but power_now is reasonable. I'm on upower 0.9.1 and hp
2133.
I took a look at sourcecode of upower 0.9.1. With knowledge of just one
c-course, I came to an idea that the problem might be the following
piece of code in up-device-supply.c:
/* get rate; it seems odd as it's either in uVh or uWh */
energy_rate = fabs (sysfs_get_double (native_path, "current_now") /
1000000.0);
/* convert charge to energy */
if (energy == 0) {
energy = sysfs_get_double (native_path, "charge_now") /
1000000.0;
if (energy == 0)
energy = sysfs_get_double (native_path, "charge_avg") /
1000000.0;
energy *= voltage_design;
energy_rate *= voltage_design;
}
energy_rate rate gets converted from Ampere to Watts only when energy is zero
(bug?). But in addition to correcting this we could use power_now as primary
source of information. How about changing this code to:
/* get rate; it seems odd as it's either in uVh or uWh */
energy_rate = fabs (sysfs_get_double (native_path, "power_now") /
1000000.0);
if (energy_rate == 0) {
energy_rate = fabs (sysfs_get_double (native_path,
"current_now") / 1000000.0);
energy_rate *= voltage_design;
}
/* convert charge to energy */
if (energy == 0) {
energy = sysfs_get_double (native_path, "charge_now") /
1000000.0;
if (energy == 0)
energy = sysfs_get_double (native_path, "charge_avg") /
1000000.0;
energy *= voltage_design;
}
I would like to test this idea in my netbook, but couldn't figure out how to
build ubuntu version of upower 0.9.1. There are some source packages in
http://packages.ubuntu.com/source/lucid/upower
but when extrating package upower_0.9.1.orig.tar.gz, it creates a directory
UPower-0.9.1. When trying to apply upower_0.9.1-1.diff.gz by
patch -p0 < upower_0.9.1-1.diff
I get another directory upower-0.9.1 with debian subdirectory.
Could anyone explain in layman terms the whole ubuntu version of upower build
and installation process??
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https://bugs.launchpad.net/bugs/531190
Title:
upower (devkit-power) reporting bad data when AC cable is unplugged
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