Okay, an interesting hint is that this problem seems to be fixed if
u-s-d is started under the Upstart user session instead of the systemd
user session.
If anyone wants to try this, just comment out these three lines in
/etc/X11/Xsession.d/00upstart:
if [ "${1#*.target}" != "$1" ]; then
export
XDG_CONFIG_DIRS="/usr/share/upstart/systemd-session:$XDG_CONFIG_DIRS"
fi
I'm attaching the result of me starting u-s-d under Upstart, running
`sudo forkstat -D 4`, and then pressing the brightness up key.
(I'll attach the same from under systemd next comment.)
>From talking to Martin Pitt on IRC, sounds like switching u-s-d back to
being started by Upstart might not be viable, but hopefully this at
least helps narrow the search.
** Attachment added: "with-upstart.txt"
https://bugs.launchpad.net/ubuntu/+source/unity-settings-daemon/+bug/1626651/+attachment/4756098/+files/with-upstart.txt
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https://bugs.launchpad.net/bugs/1626651
Title:
brightness keys are handled slower in Yakkety than Xenial
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