I can't say I have the exact same problem because I'm on a desktop
machine but I have noticed that the power management in general seems to
be broken. For example, in XFCE power manager I have the screen to blank
at 15 minutes, sleep at 25, and off at 35. Even after many hours it
never even blanks the screen.
Fresh clean Xubuntu 15.10 install here. Tried on 3 different desktop
machines with various hardware (some UEFI, some old BIOS, some nVidia,
some AMD) and the power management doesn't work on any of them.
I also notice that for some reason the GNOME power manager is installed.
Maybe it was pulled in by some other package? (not sure which but I do
not have the gnome or ubuntu desktop installed, only xubuntu). It does
not appear to be running though.
I have these processes running related to "power":
/usr/lib/upower/upowerd
xfce4-power-manager --restart --sm-client-id 2f123...
/usr/lib/x86_64-linux-gnu/xfce4/panel/wrapper-1.0
/usr/lib/x86_64-linux-gnu/xfce4/panel/plugins/libxfce4powermanager.so..
/usr/lib/x86_64-linux-gnu/indicator-power/indicator-power-service
xfce4-power-manager-settings
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https://bugs.launchpad.net/bugs/1511402
Title:
Xubuntu not suspending on lid close
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