I'm having the same problem with my Dell XPS 15z with dual video cards.
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https://bugs.launchpad.net/bugs/1012277
Title:
Closing laptop lid should not blank external monitor
Status in “gnome-power-manager” package in Ubuntu:
Confirmed
Bug description:
I'm using Precise Pangolin installed from scratch, with the latest
updates.
txelu@txelu-acer:~$ lsb_release -rd
Description: Ubuntu 12.04 LTS
Release: 12.04
My problem is that I have my laptop connected to an external monitor, and if
I started Ubuntu with the lid open I can't close, because not only the laptop
screen goes blank, but also the external monitor.
As a curious detail if I close the lid right after switching on the laptop,
before Ubuntu starts up, it works as expected.
Of course, I have set the Energy configuration to do nothing on closing the
lid, and I agree that the laptop screen in that situation should go black, but
not the external screen.
There is a similar bug filled against previous versions of Ubuntu (#416236)
that was considered a regression, but in that case there was a workaround using
gconf-editor to manually edit the settings for the gnome-power-manager, but
there is no such a entry now in 12.04.
To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/gnome-power-manager/+bug/1012277/+subscriptions
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