Bug#684186: Kernel doesn't produce any power related uevents on HP Folio 13-2000
No matter if I'm on battery (discharging) or have the ac adapter plugged
in (charging), if I'm plugging the ac adapter in or out – I don't see
any power related uevents from the kernel with 'udevadm monitor' or
'udevadm monitor --kernel'. I also tried to change the logging priority
of udevadm with 'udevadm control --log-priority=debug' – but without any
luck.
Since the kernel sends no power related uevents, UPower doesn't update
the status of the ac adapter (un/plugged). The value 'Updated' for
device /org/freedesktop/UPower/devices/line_power_ACAD reported by
UPower will always be similar to uptime, no matter how long that is and
how often I un/plugged the ac adapter in the meantime. When I booted
with the ac adapter plugged in and at some point I plug it out and
decided to work on battery my notebook will never be sent into
hibernation because UPower thinks the ac adapter is still plugged in. I
guess UPower expects an uevent from the kernel.
However, UPower seems to force an update of the battery status every 30
seconds (upowerd tells me: 'No updates on
supply /org/freedesktop/UPower/devices/battery_BAT1 for 30 seconds;
forcing update'), so the charging level reported by the battery status
applet in GNOME corresponds to the reported value
in /sys/class/power_supply/BAT1/uevent (POWER_SUPPLY_CAPACITY).
This bug was filed against UPower but now I realized that UPower waits
for uevents from the kernel regarding the battery and the ac adapter
status; but since there are no power related uevents from the kernel at
all I have reasons to this in fact is a kernel bug.
Reply to: