Yeah, either this is not fixed, or there are multiple issues that
manifest in a similar way. I'm running 14.04 in 64-bit mode, fully up to
date, on a Dell notebook with nVidia FX 2700M video card. I have added
the lines in /etc/systemd/logind.conf:
HandlePowerKey=ignore
HandleSuspendKey=ignore
HandleHibernateKey=ignore
HandleLidSwitch=ignore
so that theoretically the power management features are only managed by
light locker now. I have xfce configured to never suspend the computer.
Display is configured to blank after 10, turn off after 15 minutes, and
locker is set to lock the screen whenever the screensaver is enabled.
When I close the lid, it locks the screen with light locker, and my
display turns off. When I reopen the screen some time later, the lock
screen appears and I can unlock with my password. Then the screen goes
black.
In some cases, the shortcut key bound to 'xrandr --output LVDS-1 --auto'
will bring the screen back to life. In other cases, no amount of
hammering the shortcut key will wake up the display. I'm forced to
emergency sync/reboot with the magic SysRq key. I'm not sure what's
different, except that it seems less likely to turn on again if it's
been a while since I've used the computer.
Like Claude, the xfconf-query command returns false. I have done the 1a
and 1b steps from the earlier comments. I haven't found any messages in
syslog around the time of these events, so there's not a lot I can do to
further debug the problem, it seems.
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https://bugs.launchpad.net/bugs/1303736
Title:
[SRU] Black screen after wakeup from suspending by closing the laptop
lid
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https://bugs.launchpad.net/xfce4-power-manager/+bug/1303736/+subscriptions
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