Description of problem:
Logged in to my machine on Fedora 22 alpha - a 'report this problem' error pops up.

Additional info:
reporter:       libreport-2.5.0
WARNING: CPU: 3 PID: 1533 at drivers/gpu/drm/i915/intel_display.c:1260 assert_plane.constprop.80+0x74/0xb0 [i915]()
plane A assertion failure (expected on, current off)
Modules linked in: fuse ccm bnep arc4 intel_rapl iosf_mbi pn544_mei x86_pkg_temp_thermal coretemp mei_phy kvm_intel pn544 hci iwlmvm nfc iTCO_wdt ppdev iTCO_vendor_support dell_wmi sparse_keymap kvm mac80211 dell_laptop dcdbas uvcvideo snd_soc_rt5640 snd_hda_codec_hdmi i8k snd_hda_codec_realtek snd_soc_rl6231 iwlwifi snd_hda_codec_generic snd_soc_core videobuf2_vmalloc videobuf2_core videobuf2_memops v4l2_common snd_hda_intel videodev snd_hda_controller btusb media joydev snd_hda_codec cfg80211 bluetooth snd_compress serio_raw snd_pcm_dmaengine lpc_ich snd_hwdep snd_seq mfd_core rfkill snd_seq_device i2c_i801 shpchp snd_pcm parport_pc wmi parport dell_smo8800 snd_timer regmap_i2c i2c_hid dw_dmac mei_me snd_soc_sst_acpi dw_dmac_core snd mei i2c_designware_platform soundcore i2c_designware_core
 binfmt_misc dm_crypt i915 crct10dif_pclmul i2c_algo_bit drm_kms_helper crc32_pclmul drm crc32c_intel e1000e ghash_clmulni_intel ptp sdhci_pci pps_core sdhci_acpi sdhci mmc_core video
CPU: 3 PID: 1533 Comm: Xorg Not tainted 4.0.0-0.rc5.git4.1.fc22.x86_64 #1
Hardware name: Dell Inc. Latitude E7440/091TRH, BIOS A08 02/18/2014
 0000000000000000 000000004200dce7 ffff8802132a3648 ffffffff8178207a
 0000000000000000 ffff8802132a36a0 ffff8802132a3688 ffffffff8109b82a
 0000000100000000 0000000000000000 ffff8802122a0000 ffff88021220d000
Call Trace:
 [<ffffffff8178207a>] dump_stack+0x45/0x57
 [<ffffffff8109b82a>] warn_slowpath_common+0x8a/0xc0
 [<ffffffff8109b8b5>] warn_slowpath_fmt+0x55/0x70
 [<ffffffffa01d68a4>] assert_plane.constprop.80+0x74/0xb0 [i915]
 [<ffffffffa01ddfd3>] hsw_disable_ips+0x43/0x1a0 [i915]
 [<ffffffffa01de3b8>] intel_crtc_disable_planes+0x48/0x150 [i915]
 [<ffffffffa01ec272>] ? intel_fbc_update+0x202/0x6f0 [i915]
 [<ffffffffa01df177>] haswell_crtc_disable+0x47/0x3c0 [i915]
 [<ffffffffa01e0064>] __intel_set_mode+0x9a4/0xb80 [i915]
 [<ffffffffa01fd31d>] ? intel_ddi_compute_config+0x3d/0xa0 [i915]
 [<ffffffffa01e742f>] intel_crtc_set_config+0xc9f/0x1010 [i915]
 [<ffffffffa00f0e17>] ? drm_atomic_state_free+0x27/0x60 [drm]
 [<ffffffffa00e1026>] drm_mode_set_config_internal+0x66/0x100 [drm]
 [<ffffffffa0159718>] restore_fbdev_mode+0xc8/0xf0 [drm_kms_helper]
 [<ffffffffa015b769>] drm_fb_helper_restore_fbdev_mode_unlocked+0x29/0x80 [drm_kms_helper]
 [<ffffffffa015b7e2>] drm_fb_helper_set_par+0x22/0x50 [drm_kms_helper]
 [<ffffffffa01f6d0a>] intel_fbdev_set_par+0x1a/0x60 [i915]
 [<ffffffff8133d75d>] ? context_struct_compute_av+0x34d/0x440
 [<ffffffff814174b6>] fb_set_var+0x236/0x480
 [<ffffffff81326987>] ? avc_alloc_node+0x27/0x130
 [<ffffffff813adb79>] ? flex_array_get_ptr+0x9/0x20
 [<ffffffff8133d8b5>] ? type_attribute_bounds_av+0x65/0x2f0
 [<ffffffff81326987>] ? avc_alloc_node+0x27/0x130
 [<ffffffff8140cf9c>] fbcon_blank+0x34c/0x390
 [<ffffffff81493eca>] do_unblank_screen+0xda/0x1d0
 [<ffffffff81488b3b>] vt_ioctl+0x57b/0x1430
 [<ffffffff81326987>] ? avc_alloc_node+0x27/0x130
 [<ffffffff8147b821>] tty_ioctl+0x3f1/0xc30
 [<ffffffff81327178>] ? avc_has_perm+0x128/0x1a0
 [<ffffffff81327563>] ? selinux_file_free_security+0x23/0x30
 [<ffffffff81231bb6>] do_vfs_ioctl+0x2c6/0x4d0
 [<ffffffff81231e41>] SyS_ioctl+0x81/0xa0
 [<ffffffff81788509>] system_call_fastpath+0x12/0x17