Created attachment 932499 [details]
Fedora 21 dmesg

Description of problem:

Booting desktop with HDMI monitor plugged into active displayport -> hdmi dongle, the screen never lights up. Looking in dmesg you can see multiple backtraces and interrupt storm message.

Works fine under Windows 8.1

Version-Release number of selected component (if applicable):

Fedora 21 live image - (Fedora-Live-Workstation-x86_64-21-20140827.iso)

How reproducible:

Every time.

Steps to Reproduce:
1. Plug in monitor
2. Turn on computer
3. Screen does not work.

Actual results:

Screen does not work.

Expected results:

Screen should work.

Additional info:

[    2.488487] ------------[ cut here ]------------
[    2.488507] WARNING: CPU: 0 PID: 4 at drivers/gpu/drm/i915/intel_dp.c:3122 intel_dp_link_down+0x1a9/0x230 [i915]()
[    2.488509] Modules linked in: usb_storage i915 crct10dif_pclmul crc32_pclmul crc32c_intel drm_kms_helper igb ghash_clmulni_intel drm firewire_ohci e1000e mxm_wmi firewire_core dca i2c_algo_bit crc_itu_t i2c_core ptp pps_core video wmi sunrpc loop
[    2.488522] CPU: 0 PID: 4 Comm: kworker/0:0 Not tainted 3.16.1-301.fc21.x86_64 #1
[    2.488523] Hardware name: Gigabyte Technology Co., Ltd. Z87X-UD5H/Z87X-UD5H-CF, BIOS 10c 06/12/2014
[    2.488532] Workqueue: events i915_hotplug_work_func [i915]
[    2.488533]  0000000000000000 0000000019613b05 ffff8807f36ffc88 ffffffff8171bb42
[    2.488535]  0000000000000000 ffff8807f36ffcc0 ffffffff8108f25d ffff8807ebde0000
[    2.488537]  0000000080000002 ffff8807f336b800 0000000000000003 ffff8807f336f0d8
[    2.488539] Call Trace:
[    2.488545]  [<ffffffff8171bb42>] dump_stack+0x45/0x56
[    2.488548]  [<ffffffff8108f25d>] warn_slowpath_common+0x7d/0xa0
[    2.488550]  [<ffffffff8108f38a>] warn_slowpath_null+0x1a/0x20
[    2.488560]  [<ffffffffa024a9e9>] intel_dp_link_down+0x1a9/0x230 [i915]
[    2.488571]  [<ffffffffa024ff45>] intel_dp_complete_link_train+0x105/0x390 [i915]
[    2.488582]  [<ffffffffa0250858>] intel_dp_check_link_status+0xb8/0x1b0 [i915]
[    2.488591]  [<ffffffffa02473c8>] intel_ddi_hot_plug+0x28/0x30 [i915]
[    2.488599]  [<ffffffffa020be14>] i915_hotplug_work_func+0x1f4/0x340 [i915]
[    2.488602]  [<ffffffff810abb96>] process_one_work+0x176/0x470
[    2.488604]  [<ffffffff810ac5ab>] worker_thread+0x6b/0x550
[    2.488606]  [<ffffffff810ac540>] ? rescuer_thread+0x2e0/0x2e0
[    2.488608]  [<ffffffff810b306a>] kthread+0xea/0x100
[    2.488610]  [<ffffffff810b2f80>] ? insert_kthread_work+0x40/0x40
[    2.488612]  [<ffffffff8172293c>] ret_from_fork+0x7c/0xb0
[    2.488614]  [<ffffffff810b2f80>] ? insert_kthread_work+0x40/0x40
[    2.488615] ---[ end trace aac0e35e4904b35c ]---

...

[   22.234054] [drm] HPD interrupt storm detected on connector DP-1: switching from hotplug detection to polling