Comment 16 for bug 1384342

I just had my system freeze, all 3 monitors were frozen for a few minutes, no mouse cursor or anything else moving, but sound still worked, then the monitors went black for a couple more minutes (maybe because I pressed ctrl-alt-f1 at some point, dunno), and after a while longer it all came back to normal. I'm on Kubuntu 14.10 for a week now, and never encountered this issue before. I don't know what this is about, but the syslog error is reminiscent of the ones above (on Haswell though):

[Fri Oct 31 22:04:45 2014] CPU: 0 PID: 1806 Comm: Xorg Tainted: G W OE 3.16.0-23-generic #31-Ubuntu
[Fri Oct 31 22:04:45 2014] Hardware name: To Be Filled By O.E.M. To Be Filled By O.E.M./Z87 Extreme6, BIOS P2.40 07/08/2014
[Fri Oct 31 22:04:45 2014] 0000000000000009 ffff8804082ffac8 ffffffff8177fcbc 0000000000000000
[Fri Oct 31 22:04:45 2014] ffff8804082ffb00 ffffffff8106fd8d 0000000000000000 ffff880408fd6000
[Fri Oct 31 22:04:45 2014] ffff880035938210 ffff880404b88800 ffff880404b88800 ffff8804082ffb10
[Fri Oct 31 22:04:45 2014] Call Trace:
[Fri Oct 31 22:04:45 2014] [<ffffffff8177fcbc>] dump_stack+0x45/0x56
[Fri Oct 31 22:04:45 2014] [<ffffffff8106fd8d>] warn_slowpath_common+0x7d/0xa0
[Fri Oct 31 22:04:45 2014] [<ffffffff8106fe6a>] warn_slowpath_null+0x1a/0x20
[Fri Oct 31 22:04:45 2014] [<ffffffffc0283ffc>] intel_crtc_wait_for_pending_flips+0x16c/0x180 [i915]
[Fri Oct 31 22:04:45 2014] [<ffffffff810b9590>] ? prepare_to_wait_event+0x100/0x100
[Fri Oct 31 22:04:45 2014] [<ffffffffc0286ac3>] intel_crtc_disable_planes+0x33/0x1c0 [i915]
[Fri Oct 31 22:04:45 2014] [<ffffffffc0287a17>] haswell_crtc_disable+0x57/0x2e0 [i915]
[Fri Oct 31 22:04:45 2014] [<ffffffffc02898bb>] __intel_set_mode+0x7ab/0xab0 [i915]
[Fri Oct 31 22:04:45 2014] [<ffffffffc028caf6>] intel_set_mode+0x16/0x30 [i915]
[Fri Oct 31 22:04:45 2014] [<ffffffffc028dbba>] intel_crtc_set_config+0xa4a/0xda0 [i915]
[Fri Oct 31 22:04:45 2014] [<ffffffffc00f66d1>] drm_mode_set_config_internal+0x61/0xe0 [drm]
[Fri Oct 31 22:04:45 2014] [<ffffffffc00fa413>] drm_mode_setcrtc+0x283/0x580 [drm]
[Fri Oct 31 22:04:45 2014] [<ffffffffc00eaa4f>] drm_ioctl+0x1df/0x680 [drm]
[Fri Oct 31 22:04:45 2014] [<ffffffff811f4bc8>] do_vfs_ioctl+0x2c8/0x4a0
[Fri Oct 31 22:04:45 2014] [<ffffffff811e31a1>] ? __sb_end_write+0x31/0x60
[Fri Oct 31 22:04:45 2014] [<ffffffff811e0d12>] ? vfs_write+0x1b2/0x1f0
[Fri Oct 31 22:04:45 2014] [<ffffffff811f4e21>] SyS_ioctl+0x81/0xa0
[Fri Oct 31 22:04:45 2014] [<ffffffff81787ced>] system_call_fastpath+0x1a/0x1f
[Fri Oct 31 22:04:45 2014] ---[ end trace 9b44a589aabc549c ]---