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I was very happy with my LXDE running on my Dell XPS 13 until, a few days ago, I found myself confronted with a dialgue box that presented the choices "desktop" or "laptop". It was set to "desktop", but I thought to myself "gosh, that cannot be correct" and so I set it to "laptop" and forgot about it.

A while later I began to experience problems with massive lag and slowdowns that I had never experienced before. I thought they were related to other issues but I have since discovered that plugging my laptop into external power seems to cure the problem instantly, and so I am coming to realise that I inadvertently messed something up.

The problem is that I do not remember where this dialogue box arose nor (exactly) what it was controlling. Can anybody indicate what I might have messed with and how to rectify it? I'm sure the dastardly setting was within one or two clicks of the LXDE main menu.

(Preferences > Power Manager would seem to be an obvious candidate but it tosses up dialogue box about Xfce4-power-manager not being loaded which I do not recall seeing when I messed things up, and even if I choose to load it I later get an error message about being unable to connect to it.)

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Succeeded in getting Xfce4-power-manager-settings to run by invoking it from the command-line with sudo. It definitely isn't what I had messed with (I would remember it because it has a distinctive interface and has caused a new icon to appear in the system tray.) Incidentally altering settings here does not solve my problem either. – qubex May 19 '14 at 11:17
It turns out that the setting I remembered fiddling with was Preferences > Default applications for LXSession > Settings > Laptop mode. Changing it back from 'yes' to 'no' or (somewhat enigmatically) 'Unknown' does not seem to solve the issue. What does have an effect is starting and stopping TLP. – qubex May 19 '14 at 15:10

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