Description of problem:
I have a new Dell Precision m3800. It has Intel video which is connected to all the display outputs and an Nvidia Quadro.
The DisplayPort is also Thunderbolt.
When I plug in an external Dell 4K monitor the system freezes completely. Caps lock does not switch states. I have no log output from the freeze after rebooting.
HOWEVER, a test with a Ubuntu 14.04 live CD WORKS. So, there is some difference between the Ubuntu versions and the Fedora versions which cause this crash.
ALSO, if I boot into text mode and plug in the monitor nothing bad happens. As soon as I start X it freezes.
Version-Release number of selected component (if applicable):
00:02.0 VGA compatible controller: Intel Corporation 4th Gen Core Processor Integrated Graphics Controller (rev 06)
02:00.0 3D controller: NVIDIA Corporation GK107GLM [Quadro K1100M]
Every time that I plug it in.
Steps to Reproduce:
1. Boot Fedora 21 to GUI.
2. Plug in external monitor
Should be able to use the monitor.
Also fails on Fedora 22.
Also fails when connecting same Dell external 4K monitor via HDMI.
An external 1080p projector via HDMI did work. For about an hour in both X and Wayland. Then it also froze. No way to tell if it froze for the same reason however.
I'm seeing the same thing with a Thinkpad T440s; when I attach a Dell 4k monitor via Displayport, the Thinkpad often (but not always) completely hangs.
The Thinkpad is just using Intel graphics; there's no Nvidia component to complicate things.
The latest 4.2 kernels seem to have fixed this problem.
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