Additional info:
reporter:       libreport-2.3.0
WARNING: CPU: 0 PID: 1338 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: nf_conntrack_netbios_ns nf_conntrack_broadcast ip6t_rpfilter ip6t_REJECT xt_conntrack ebtable_nat ebtable_broute 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 ccm nls_utf8 isofs rfcomm fuse bridge stp llc bnep arc4 iwlmvm iTCO_wdt mac80211 iTCO_vendor_support uvcvideo videobuf2_vmalloc videobuf2_memops videobuf2_core v4l2_common x86_pkg_temp_thermal coretemp kvm_intel kvm iwlwifi btusb snd_hda_codec_realtek snd_hda_codec_hdmi bluetooth snd_hda_codec_generic cfg80211 videodev snd_hda_intel snd_hda_controller snd_hda_codec serio_raw snd_hwdep
 snd_seq i2c_i801 rtsx_pci_ms snd_seq_device memstick lpc_ich snd_pcm media mei_me shpchp mei thinkpad_acpi snd_timer wmi snd soundcore tpm_tis rfkill tpm dm_crypt uas usb_storage i915 rtsx_pci_sdmmc mmc_core crct10dif_pclmul crc32_pclmul crc32c_intel i2c_algo_bit drm_kms_helper ghash_clmulni_intel e1000e drm rtsx_pci mfd_core ptp pps_core video [last unloaded: iptable_raw]
CPU: 0 PID: 1338 Comm: Xorg.bin Not tainted 3.17.4-301.fc21.x86_64 #1
Hardware name: LENOVO 20ARS19C02/20ARS19C02, BIOS GJET71WW (2.21 ) 02/10/2014
 0000000000000000 00000000381cd549 ffff8802ff443760 ffffffff8173f929
 ffff8802ff4437a8 ffff8802ff443798 ffffffff810970ad 0000000000000000
 ffff8800c8ddc000 ffff880309551800 ffff880036ec0000 0000000000000000
Call Trace:
 [<ffffffff8173f929>] dump_stack+0x45/0x56
 [<ffffffff810970ad>] warn_slowpath_common+0x7d/0xa0
 [<ffffffff8109712c>] warn_slowpath_fmt+0x5c/0x80
 [<ffffffffa017bffb>] assert_plane.constprop.78+0x6b/0x70 [i915]
 [<ffffffffa0181361>] hsw_disable_ips+0x41/0x190 [i915]
 [<ffffffffa0187c59>] intel_crtc_disable_planes+0x49/0x160 [i915]
 [<ffffffffa0188b77>] haswell_crtc_disable+0x57/0x340 [i915]
 [<ffffffffa0182801>] __intel_set_mode+0x7e1/0x16f0 [i915]
 [<ffffffff81381c2b>] ? cpumask_next_and+0x3b/0x50
 [<ffffffffa018b126>] intel_set_mode+0x16/0x30 [i915]
 [<ffffffffa018c27a>] intel_crtc_set_config+0xa9a/0xeb0 [i915]
 [<ffffffff810db778>] ? mutex_spin_on_owner+0x48/0x70
 [<ffffffffa003ea34>] drm_mode_set_config_internal+0x64/0xe0 [drm]
 [<ffffffffa00e5153>] restore_fbdev_mode+0xb3/0xe0 [drm_kms_helper]
 [<ffffffffa00e51a3>] drm_fb_helper_restore_fbdev_mode_unlocked+0x23/0x40 [drm_kms_helper]
 [<ffffffffa00e6ca8>] drm_fb_helper_set_par+0x28/0x70 [drm_kms_helper]
 [<ffffffffa0196dfa>] intel_fbdev_set_par+0x1a/0x60 [i915]
 [<ffffffff813f42a0>] fb_set_var+0x190/0x420
 [<ffffffff8119c556>] ? free_hot_cold_page_list+0x46/0xa0
 [<ffffffff813ea8c9>] fbcon_blank+0x259/0x340
 [<ffffffff8146c1ca>] do_unblank_screen+0xba/0x1f0
 [<ffffffff81463231>] vt_ioctl+0x13b1/0x1430
 [<ffffffff813105e7>] ? avc_alloc_node+0x27/0x130
 [<ffffffff8145695d>] tty_ioctl+0x2ad/0xbf0
 [<ffffffff81310da9>] ? avc_has_perm+0xd9/0x1a0
 [<ffffffff81220910>] do_vfs_ioctl+0x2d0/0x4b0
 [<ffffffff8120e3ae>] ? ____fput+0xe/0x10
 [<ffffffff81220b71>] SyS_ioctl+0x81/0xa0
 [<ffffffff81746ae9>] system_call_fastpath+0x16/0x1b