Description of problem:
This happens after the screen is locked due to inactivity, as defined in GNOME Settings > Privacy > Lock Screen.

Additional info:
reporter:       libreport-2.3.0
WARNING: CPU: 0 PID: 1078 at drivers/gpu/drm/i915/intel_pm.c:6317 intel_display_power_put+0x14c/0x160 [i915]()
Modules linked in: uas usb_storage rfcomm 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 binfmt_misc bnep arc4 x86_pkg_temp_thermal coretemp kvm_intel kvm hid_sensor_gyro_3d hid_sensor_incl_3d hid_sensor_accel_3d hid_sensor_magn_3d hid_sensor_rotation hid_sensor_als hid_sensor_trigger industrialio_triggered_buffer kfifo_buf industrialio hid_sensor_iio_common iTCO_wdt iwlmvm iTCO_vendor_support
 crct10dif_pclmul crc32_pclmul mac80211 vfat fat uvcvideo crc32c_intel snd_hda_codec_conexant snd_hda_codec_generic snd_hda_codec_hdmi ghash_clmulni_intel videobuf2_vmalloc videobuf2_memops videobuf2_core v4l2_common wacom btusb hid_sensor_hub iwlwifi snd_hda_intel bluetooth videodev joydev snd_hda_controller serio_raw i2c_i801 snd_hda_codec hid_multitouch cfg80211 media snd_hwdep snd_seq rtsx_pci_ms snd_seq_device memstick snd_pcm thinkpad_acpi wmi rfkill snd_timer mei_me snd lpc_ich mei soundcore shpchp btrfs xor i915 rtsx_pci_sdmmc raid6_pq mmc_core i2c_algo_bit drm_kms_helper drm rtsx_pci mfd_core video
CPU: 0 PID: 1078 Comm: Xorg.bin Not tainted 3.17.4-300.fc21.x86_64 #1
Hardware name: LENOVO 20CDCTO1WW/20CDCTO1WW, BIOS GQET38WW (1.18 ) 09/09/2014
 0000000000000000 0000000017485ba5 ffff8800ce7abc70 ffffffff8173f929
 0000000000000000 ffff8800ce7abca8 ffffffff810970ad ffff8802116d002c
 000000000000000b ffff8802116d8610 0000000000000001 ffff8802116d0000
Call Trace:
 [<ffffffff8173f929>] dump_stack+0x45/0x56
 [<ffffffff810970ad>] warn_slowpath_common+0x7d/0xa0
 [<ffffffff810971da>] warn_slowpath_null+0x1a/0x20
 [<ffffffffa00e233c>] intel_display_power_put+0x14c/0x160 [i915]
 [<ffffffffa012de53>] intel_crtc_control+0x83/0x100 [i915]
 [<ffffffffa012df37>] intel_crtc_update_dpms+0x67/0x80 [i915]
 [<ffffffffa01370f9>] intel_connector_dpms+0x59/0x70 [i915]
 [<ffffffffa0038389>] drm_mode_obj_set_property_ioctl+0x399/0x3a0 [drm]
 [<ffffffffa00383cf>] drm_mode_connector_property_set_ioctl+0x3f/0x60 [drm]
 [<ffffffffa0028e6f>] drm_ioctl+0x1df/0x680 [drm]
 [<ffffffff813f36fe>] ? brightness_store+0xee/0x120
 [<ffffffff8124c87c>] ? fsnotify+0x28c/0x370
 [<ffffffff81220910>] do_vfs_ioctl+0x2d0/0x4b0
 [<ffffffff81220b71>] SyS_ioctl+0x81/0xa0
 [<ffffffff81135d86>] ? __audit_syscall_exit+0x1f6/0x2a0
 [<ffffffff81746ae9>] system_call_fastpath+0x16/0x1b