It is. The difference is in the detail ;)
with hdapsd -t I get here:
11:29 evg...@nana ~ % sudo powertop -d |grep hdaps
5.4% ( 49.9) [kernel core] __mod_timer (hdaps_mousedev_poll)
with hdapsd -t -y I get:
11:30 evg...@nana ~ % sudo powertop -d |grep hdaps
8.7% ( 49.6) hdapsd
The wakeups are moved between the kernel (input-mode) and the userspace
(poll-sysfs mode).
Thus, it is event based in input-mode, but someone has to create the events,
and for that the hardware has to be polled. Full stop. As far as I can tell
(without any further kernel-knowledge) kernel-wakeups are "cheaper" as no
userspace is involved.
Closing the bug as you said :)
** Changed in: hdapsd (Ubuntu)
Status: New => Invalid
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https://bugs.launchpad.net/bugs/687282
Title:
hdapsd drains unnecessary power polling /sys
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