Comment 50 for bug 745112

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