Thanks, Eugene. Your solution works for me as well.
To complete this workaround, I've added a script to handle turning off
the X dpms timeouts when the user logs in. Here are the three files
that I've created. First, the config file:
/etc/lightdm/lightdm.conf.d/50-dpms.conf
--- cut here -------------
[SeatDefaults]
display-setup-script=/etc/lightdm/dpms-enable
session-setup-script=/etc/lightdm/dpms-disable
--- cut here -------------
Make sure the above is owned by root. Easiest is to create it with
sudoedit.
Next are the two scripts. These need to be owned by root and made
executable (chmod +x).
/etc/lightdm/dpms-enable
--- cut here -------------
#!/bin/sh
(
# This delay is required. Might be because the X server isn't
# started yet.
sleep 10
# Set up a 5 minute timeout before powering off the display.
xset dpms 0 0 300
) &
--- cut here -------------
/etc/lightdm/dpms-disable
--- cut here -------------
#!/bin/sh
(
# This delay is required. Might be because the X server isn't
# started yet.
sleep 10
# Turn off X's handling of dpms timeout. Otherwise
# gnome-settings-daemon and gnome-screensaver will fight over it.
xset dpms 0 0 0
) &
--- cut here -------------
Given the above, I get monitor power-down at the login screen, and the
dpms timeouts are set to zero for a user session, so the screensaver
works properly.
Is this the right solution? I'm not sure. So far, I've been unable to
track down how 13.04 did this without config files and scripts. It
would be nice to have that for comparison.
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https://bugs.launchpad.net/bugs/1245474
Title:
[regression] on login screen, monitor stays on forever
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