Status changed to 'Confirmed' because the bug affects multiple users.
** Changed in: xserver-xorg-input-synaptics (Ubuntu)
Status: New => Confirmed
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https://bugs.launchpad.net/bugs/1173077
Title:
syndaemon lies about its functionality, -R doesn't use XRecord
Status in “xserver-xorg-input-synaptics” package in Ubuntu:
Confirmed
Bug description:
With a friend we checked the processor wakeups of my laptop with
powertop. We spotted syndaemon. Investigating it, I found out that it
polls, although an option was set to block and wait using some XRecord
extension of X11. The option -R is also set in the current
configuration of syndaemon in 12.10. Also the man page doesn't tell
one about the deactivated -R option. I compiled it myself, with the
option compiled in (need to install libxtst-dev) and it blocked and
waited like expected. When I read about the lengthy bugreports of
ancient times about polling in syndaemon.
https://bugs.launchpad.net/ubuntu/+source/xserver-xorg-input-
synaptics/+bug/906987
As I understand them, X11 crashes randomly when XRecord is used. And
the chosen solution was to deactivate the usage of XRecord in
syndaemon.
I am not satisfied with the situation.
* man page shouldn't list -R if it is not compiled in; it was misleading to me
* syndaemon shouldnt be started with -R, when it has no affect; it was
misleading to me
* there should be a power measurement documented somewhere which defends
polling against power drainage; the decision is weird on battery powered devices
* XRecord should be deactivated in X11; who guarantees that another app than
syndaemon comes by using XRecord?
* XRecord should be fixed in X11 (the bug description and tried fixes arent
exhaustive by far!)
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