Comment 12 for bug 599626

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Geir Ove Myhr (gomyhr) wrote : Re: [arrandale] X freezes after plugging in external monitor and selecting System>Preferences>Monitors

Bonne, what exactly do you mean by "it worked the second time"? Do you mean that there was no freeze or that it froze but did not bring the network down? If it froze, the logs show that this is not a GPU hang as I first suspected.

Do you connect to the computer via wireless? The wireless networking is started from X, so if X goes down it may take the wireless connection with it. For debugging X issues it is better to be connected via an ethernet cable.

What you write in commen #6:
BUG: soft lockup - CPU#0 stuck for 61s! [plymouthd:409]
indicates that this may have something to do with plymouth. Could you remove the boot option "splash" (in the same way as you added drm.debug=0x02) and see if that changes the result of any of the tests?