Description of problem:
I clicked on "Log Out" button in Gnome Shell

Additional info:
reporter:       libreport-2.3.0
WARNING: CPU: 0 PID: 3110 at drivers/gpu/drm/i915/intel_display.c:1278 assert_plane.constprop.78+0x6b/0x70 [i915]()
plane A assertion failure (expected on, current off)
Modules linked in: fuse ccm xt_CHECKSUM ipt_MASQUERADE tun nf_conntrack_netbios_ns nf_conntrack_broadcast ip6t_rpfilter ip6t_REJECT xt_conntrack ebtable_nat ebtable_broute bridge stp llc ebtable_filter ebtables ip6table_nat nf_conntrack_ipv6 nf_defrag_ipv6 nf_nat_ipv6 ip6table_mangle ip6table_security ip6table_raw ip6table_filter ip6_tables iptable_nat nf_conntrack_ipv4 nf_defrag_ipv4 nf_nat_ipv4 nf_nat nf_conntrack iptable_mangle iptable_security iptable_raw bnep arc4 iwlmvm iTCO_wdt iTCO_vendor_support mac80211 x86_pkg_temp_thermal coretemp uvcvideo kvm_intel videobuf2_vmalloc videobuf2_memops videobuf2_core iwlwifi v4l2_common snd_hda_codec_realtek kvm snd_hda_codec_generic snd_hda_codec_hdmi cfg80211 snd_hda_intel btusb snd_hda_controller videodev bluetooth snd_hda_codec joydev snd_hwdep
 media serio_raw snd_seq i2c_i801 rtsx_pci_ms memstick snd_seq_device lpc_ich snd_pcm wmi thinkpad_acpi mei_me tpm_tis tpm rfkill mei shpchp snd_timer snd soundcore dm_crypt i915 rtsx_pci_sdmmc mmc_core crct10dif_pclmul crc32_pclmul crc32c_intel i2c_algo_bit drm_kms_helper e1000e drm ghash_clmulni_intel rtsx_pci ptp mfd_core pps_core video
CPU: 0 PID: 3110 Comm: Xorg.bin Not tainted 3.17.2-300.fc21.x86_64 #1
Hardware name: LENOVO 20ARS19C0B/20ARS19C0B, BIOS GJET79WW (2.29 ) 09/03/2014
 0000000000000000 00000000703e415d ffff8802f995b760 ffffffff8173db01
 ffff8802f995b7a8 ffff8802f995b798 ffffffff81096e8d 0000000000000000
 ffff88030cd36000 ffff88030a73f000 ffff880309620000 0000000000000000
Call Trace:
 [<ffffffff8173db01>] dump_stack+0x45/0x56
 [<ffffffff81096e8d>] warn_slowpath_common+0x7d/0xa0
 [<ffffffff81096f0c>] warn_slowpath_fmt+0x5c/0x80
 [<ffffffffa0186f5b>] assert_plane.constprop.78+0x6b/0x70 [i915]
 [<ffffffffa018c2c1>] hsw_disable_ips+0x41/0x190 [i915]
 [<ffffffffa0192bb9>] intel_crtc_disable_planes+0x49/0x160 [i915]
 [<ffffffffa013de66>] ? intel_update_fbc+0x196/0x660 [i915]
 [<ffffffffa0193ad7>] haswell_crtc_disable+0x57/0x340 [i915]
 [<ffffffffa018d761>] __intel_set_mode+0x7e1/0x16f0 [i915]
 [<ffffffff811ebe38>] ? get_partial_node.isra.48+0x118/0x290
 [<ffffffffa0196086>] intel_set_mode+0x16/0x30 [i915]
 [<ffffffffa01971da>] intel_crtc_set_config+0xa9a/0xeb0 [i915]
 [<ffffffffa0059a34>] drm_mode_set_config_internal+0x64/0xe0 [drm]
 [<ffffffffa00fd153>] restore_fbdev_mode+0xb3/0xe0 [drm_kms_helper]
 [<ffffffffa00fd1a3>] drm_fb_helper_restore_fbdev_mode_unlocked+0x23/0x40 [drm_kms_helper]
 [<ffffffffa00feca8>] drm_fb_helper_set_par+0x28/0x70 [drm_kms_helper]
 [<ffffffffa01a1d5a>] intel_fbdev_set_par+0x1a/0x60 [i915]
 [<ffffffff813f2bc0>] fb_set_var+0x190/0x420
 [<ffffffff8119c006>] ? free_hot_cold_page_list+0x46/0xa0
 [<ffffffff813e8f89>] fbcon_blank+0x259/0x340
 [<ffffffff8146aa3a>] do_unblank_screen+0xba/0x1f0
 [<ffffffff81461ab1>] vt_ioctl+0x13b1/0x1430
 [<ffffffff8130ed87>] ? avc_alloc_node+0x27/0x130
 [<ffffffff814551dd>] tty_ioctl+0x2ad/0xbf0
 [<ffffffff8130f549>] ? avc_has_perm+0xd9/0x1a0
 [<ffffffff81220240>] do_vfs_ioctl+0x2d0/0x4b0
 [<ffffffff8120dcee>] ? ____fput+0xe/0x10
 [<ffffffff812204a1>] SyS_ioctl+0x81/0xa0
 [<ffffffff81744c69>] system_call_fastpath+0x16/0x1b