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After following the advice in this question, the second monitor is detected, and the mirroring option works (although not that smoothly). However, I'm not able to activate the second monitor in the display settings.

I got an error that says Failed to apply configuration: %s. I have no idea how to debug this. Any points or work around to fix this?

error message

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I was able to resolve this issue by switching the display off and back on using xrandr like so:

$ xrandr --output DVI-0 --off
$ xrandr --output DVI-0 --auto

I went through this just recently and summed it up on my blog. Eventually, you might be interested to read here:

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