ubuntu 12.04 LTS hangs on boot when external monitor is connected

Posted by vladeta on Ask Ubuntu See other posts from Ask Ubuntu or by vladeta
Published on 2012-06-23T13:54:29Z Indexed on 2012/06/23 15:23 UTC
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Filed under:

12.04

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grub2

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boot-failure

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external-monitor

I have a problem with my fresh installed Ubuntu 12.04 LTS on my Dell M4600:

nVidia quadro 2000M
i7-2860 16GB ram
128GB SSD Dell/Samsung
750GB HDD
IPS RGB laptop display

When it is connected via DP++ to the external Dell U2311H monitor, it hangs on boot or when wakening from suspend. If I detach the DP cable it boots normally.

I have tried all combinations that I have found, as adding to grub:

"no splash", "boot=pci", "acpi=off", etc...

I have also changed in nVidia X settings that external monitor is the primary one and also tried to delete monitor.xml file. There is no change it hangs each time after grub. It starts to load daemons then both screens are blank and then completely hangs with beep sound.

What I discovered is if I detach the cable and wait for about 2 sec after grub starts booting and then physically connect DP cable while the Ubuntu is still booting everything works normally and I have a picture on my external screen while the laptop screen is off, just as I wanted.

Do you maybe know how to solve this issue? Thank You.

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