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[wahlau <wahlau@xxxxxxxxx>]

I have been bothered by this flickering and automatic display switching
issue since installation of Natty (also previously when i upgraded from
Maverick to Natty). I am glad to find this bug here, and tried some of
the proposed solutions (mainline, backport to maverick). None of them
really works for me.

My setup is as follows: I have a T410s running natty fresh installed. At
office i have an old dell Fp2001 and a mini dock 3, at home a Samsung
225BW without dock. I realise with the office setting i do not seemed to
have the issue at all, but only at home i experience the
switching(flickering) and crash if i attempt to FN-F7 for a few times.

Now the only setup that somehow works is - maverick kernel
2.6.35-02063513-generic from mainline kernel, and with compiz turned off
then the system somehow works. When i have time i will try the 2.6.35-22
(which should be the 2.6.35-4 in mainline i suppose?) and see if that
helps me.

My suspicion is: the kernel attempt to detect the connected external
monitor, but due to some unknown reasons, it made the decision that the
monitor is missing (due to weak signal via the cable or refresh rate?)
therefore attempt to automatically change back to internal display. And
if only external monitor is selected, then the flickering mode is
selected.

hope my report and experience here helps a little. I have no idea about
the bisection thing - if it is not too difficult or time consuming i am
willing to help perhaps next week.

thanks.

regards, wahlau

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https://bugs.launchpad.net/bugs/745112

Title:
  [arrandale] desktop is messed up (goes black) when laptop is docked
  with two external 1920x1200 monitors (x86_64)