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): xorg-x11-drv-intel-2.99.916-3.20141117.fc21.x86_64 xorg-x11-drv-nouveau-1.0.11-1.fc21.x86_64 xorg-x11-server-common-1.16.3-2.fc21.x86_64 xorg-x11-server-Xorg-1.16.3-2.fc21.x86_64 kernel-3.18.8-201.fc21.x86_64 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] How reproducible: Every time that I plug it in. Steps to Reproduce: 1. Boot Fedora 21 to GUI. 2. Plug in external monitor Actual results: Freeze Expected results: Should be able to use the monitor. Additional info:
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. xorg-x11-drv-intel-2.99.917-6.20150211.fc22.x86_64 xorg-x11-server-Xorg-1.17.1-11.fc22.x86_64 xorg-x11-server-Xwayland-1.17.1-11.fc22.x86_64 kernel-4.0.2-300.fc22.x86_64
The latest 4.2 kernels seem to have fixed this problem.
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Fedora 21 changed to end-of-life (EOL) status on 2015-12-01. Fedora 21 is no longer maintained, which means that it will not receive any further security or bug fix updates. As a result we are closing this bug. If you can reproduce this bug against a currently maintained version of Fedora please feel free to reopen this bug against that version. If you are unable to reopen this bug, please file a new report against the current release. If you experience problems, please add a comment to this bug. Thank you for reporting this bug and we are sorry it could not be fixed.