Comment 2 for bug 840974

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Bryce Harrington (bryce) wrote : Re: configuration of external monitor on laptop does not work properly

Turn on display debug information by running sudo xdiagnose, clicking the first checkbox, apply, then reboot.

Now collect dmesg output, then reproduce the problem and collect a second dmesg. You want the data that's in the second dmesg but not the first.

Possibly this bug is related to bug #737891